Use file-scoped namespaces

Core/Cache/ICacheStorage.cs

@@ -1,9 +1,8 @@
-namespace Kruzya.TelegramBot.Core.Cache
+namespace Kruzya.TelegramBot.Core.Cache;
+
+public interface ICacheStorage<TKey, TValue>
 {
-    public interface ICacheStorage<TKey, TValue>
-    {
-        public bool TryGetValue(TKey key, out TValue value);
-        public void SetValue(TKey key, TValue value, int timeToLive);
-        public TValue GetOr(TKey key, TValue value);
-    }
+    public bool TryGetValue(TKey key, out TValue value);
+    public void SetValue(TKey key, TValue value, int timeToLive);
+    public TValue GetOr(TKey key, TValue value);
 }

Core/Cache/MemoryCache.cs

@@ -2,103 +2,102 @@
 using System.Collections.Generic;
 using System.Threading;
 
-namespace Kruzya.TelegramBot.Core.Cache
+namespace Kruzya.TelegramBot.Core.Cache;
+
+public class MemoryCache<TKey, TValue> : ICacheStorage<TKey, TValue>
 {
-    public class MemoryCache<TKey, TValue> : ICacheStorage<TKey, TValue>
+    /// <summary>
+    /// Represents a cache entry in internal dictionary.
+    /// </summary>
+    /// <typeparam name="TVal"></typeparam>
+    internal struct CacheEntry<TVal>
     {
-        /// <summary>
-        /// Represents a cache entry in internal dictionary.
-        /// </summary>
-        /// <typeparam name="TVal"></typeparam>
-        internal struct CacheEntry<TVal>
+        public TVal Value;
+        public DateTime Created;
+        public int ExpiresAt;
+
+        public bool IsExpired()
         {
-            public TVal Value;
-            public DateTime Created;
-            public int ExpiresAt;
-
-            public bool IsExpired()
-            {
-                if (ExpiresAt == Timeout.Infinite)
-                {
-                    return false;
-                }
-
-                return (Created.AddSeconds(ExpiresAt)) < DateTime.Now;
-            }
-        }
-        
-        /// <summary>
-        /// 
-        /// </summary>
-        private readonly Dictionary<TKey, CacheEntry<TValue>> _dict = new();
-        
-        /// <summary>
-        /// The TTL for all entries if not set.
-        /// </summary>
-        private int _defaultTtl;
-
-        public MemoryCache() : this(Timeout.Infinite)
-        {
-        }
-
-        public MemoryCache(int defaultTtl)
-        {
-            _defaultTtl = defaultTtl;
-        }
-        
-        public bool TryGetValue(TKey key, out TValue value)
-        {
-            value = default;
-            if (!_dict.ContainsKey(key))
+            if (ExpiresAt == Timeout.Infinite)
             {
                 return false;
             }
 
-            CacheEntry<TValue> temp;
-            if (!_dict.TryGetValue(key, out temp))
-            {
-                return false;
-            }
-
-            if (temp.IsExpired())
-            {
-                _dict.Remove(key);
-                return false;
-            }
-
-            value = temp.Value;
-            return true;
-        }
-
-        public TValue GetOr(TKey key, TValue defValue = default)
-        {
-            var doesExist = TryGetValue(key, out var value);
-            if (!doesExist)
-            {
-                value = defValue;
-            }
-
-            return value;
-        }
-
-        public void SetValue(TKey key, TValue value)
-        {
-            SetValue(key, value, _defaultTtl);
-        }
-        
-        public void SetValue(TKey key, TValue value, int timeToLive)
-        {
-            if (_dict.ContainsKey(key))
-            {
-                _dict.Remove(key);
-            }
-
-            _dict.Add(key, new CacheEntry<TValue>()
-            {
-                Created = DateTime.Now,
-                ExpiresAt = timeToLive,
-                Value = value
-            });
+            return (Created.AddSeconds(ExpiresAt)) < DateTime.Now;
         }
     }
+        
+    /// <summary>
+    /// 
+    /// </summary>
+    private readonly Dictionary<TKey, CacheEntry<TValue>> _dict = new();
+        
+    /// <summary>
+    /// The TTL for all entries if not set.
+    /// </summary>
+    private int _defaultTtl;
+
+    public MemoryCache() : this(Timeout.Infinite)
+    {
+    }
+
+    public MemoryCache(int defaultTtl)
+    {
+        _defaultTtl = defaultTtl;
+    }
+        
+    public bool TryGetValue(TKey key, out TValue value)
+    {
+        value = default;
+        if (!_dict.ContainsKey(key))
+        {
+            return false;
+        }
+
+        CacheEntry<TValue> temp;
+        if (!_dict.TryGetValue(key, out temp))
+        {
+            return false;
+        }
+
+        if (temp.IsExpired())
+        {
+            _dict.Remove(key);
+            return false;
+        }
+
+        value = temp.Value;
+        return true;
+    }
+
+    public TValue GetOr(TKey key, TValue defValue = default)
+    {
+        var doesExist = TryGetValue(key, out var value);
+        if (!doesExist)
+        {
+            value = defValue;
+        }
+
+        return value;
+    }
+
+    public void SetValue(TKey key, TValue value)
+    {
+        SetValue(key, value, _defaultTtl);
+    }
+        
+    public void SetValue(TKey key, TValue value, int timeToLive)
+    {
+        if (_dict.ContainsKey(key))
+        {
+            _dict.Remove(key);
+        }
+
+        _dict.Add(key, new CacheEntry<TValue>()
+        {
+            Created = DateTime.Now,
+            ExpiresAt = timeToLive,
+            Value = value
+        });
+    }
 }

Core/Core.cs

@@ -7,201 +7,200 @@ using System.Linq;
 using System.Reflection;
 using Microsoft.Extensions.Configuration;
 
-namespace Kruzya.TelegramBot.Core
+namespace Kruzya.TelegramBot.Core;
+
+public sealed class Core
 {
-    public sealed class Core
+    /// <summary>
+    /// The Core API version.
+    /// </summary>
+    public UInt32 ApiVersion => 1;
+
+    /// <summary>
+    /// The array that contains all modules instances.
+    /// </summary>
+    public Module[] Modules => _modules.ToArray();
+
+    /// <summary>
+    /// The current bot configuration.
+    /// </summary>
+    public IConfiguration Configuration => _configuration;
+
+    #region Private properties
+
+    /// <summary>
+    /// The array that contains all modules instances.
+    /// </summary>
+    private List<Module> _modules = new List<Module>();
+        
+    /// <summary>
+    /// The current bot configuration.
+    /// </summary>
+    private IConfiguration _configuration;
+
+    /// <summary>
+    /// The all directories for loading our module assemblies.
+    /// </summary>
+    private List<string> _directories
     {
-        /// <summary>
-        /// The Core API version.
-        /// </summary>
-        public UInt32 ApiVersion => 1;
-
-        /// <summary>
-        /// The array that contains all modules instances.
-        /// </summary>
-        public Module[] Modules => _modules.ToArray();
-
-        /// <summary>
-        /// The current bot configuration.
-        /// </summary>
-        public IConfiguration Configuration => _configuration;
-
-        #region Private properties
-
-        /// <summary>
-        /// The array that contains all modules instances.
-        /// </summary>
-        private List<Module> _modules = new List<Module>();
-        
-        /// <summary>
-        /// The current bot configuration.
-        /// </summary>
-        private IConfiguration _configuration;
-
-        /// <summary>
-        /// The all directories for loading our module assemblies.
-        /// </summary>
-        private List<string> _directories
+        get
         {
-            get
+            // For start, load all assemblies in required directory.
+            // And register in internal temporary array.
+            var modulesDirectory = new List<string>(new string[]
             {
-                // For start, load all assemblies in required directory.
-                // And register in internal temporary array.
-                var modulesDirectory = new List<string>(new string[]
-                {
-                    Path.Join(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "modules"),
-                    Path.Join(Environment.CurrentDirectory, "modules")
-                });
+                Path.Join(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "modules"),
+                Path.Join(Environment.CurrentDirectory, "modules")
+            });
                 
-                // Also lookup load directories from config.
-                modulesDirectory.AddRange(_configuration.GetSection("ModuleDirectories").GetChildren().Select(q => q.Value)
-                    .ToList());
+            // Also lookup load directories from config.
+            modulesDirectory.AddRange(_configuration.GetSection("ModuleDirectories").GetChildren().Select(q => q.Value)
+                .ToList());
 
-                return modulesDirectory;
+            return modulesDirectory;
+        }
+    }
+
+    /// <summary>
+    /// List of filenames (without extension) what should be not loaded.
+    /// </summary>
+    private List<string> _ignoredAssemblyFilenames => _configuration
+        .GetSection("IgnoredModuleFilenames").GetChildren()
+        .Select(q => q.Value).ToList();
+
+    #endregion
+
+    public Core(IConfiguration configuration)
+    {
+        _configuration = configuration;
+
+        HookAppDomain();
+        Start();
+    }
+
+    /// <summary>
+    /// Initializes all required submodules.
+    /// </summary>
+    private void Start()
+    {
+        var types = new List<Type>();
+        foreach (var directory in _directories)
+        {
+            if (!Directory.Exists(directory))
+            {
+                continue;
             }
-        }
 
-        /// <summary>
-        /// List of filenames (without extension) what should be not loaded.
-        /// </summary>
-        private List<string> _ignoredAssemblyFilenames => _configuration
-            .GetSection("IgnoredModuleFilenames").GetChildren()
-            .Select(q => q.Value).ToList();
-
-        #endregion
-
-        public Core(IConfiguration configuration)
-        {
-            _configuration = configuration;
-
-            HookAppDomain();
-            Start();
-        }
-
-        /// <summary>
-        /// Initializes all required submodules.
-        /// </summary>
-        private void Start()
-        {
-            var types = new List<Type>();
-            foreach (var directory in _directories)
+            foreach (var file in Directory.EnumerateFiles(directory, "*.dll", SearchOption.AllDirectories))
             {
-                if (!Directory.Exists(directory))
+                var assemblyTypes = LoadAssembly(file);
+                if (assemblyTypes == null)
                 {
                     continue;
                 }
 
-                foreach (var file in Directory.EnumerateFiles(directory, "*.dll", SearchOption.AllDirectories))
-                {
-                    var assemblyTypes = LoadAssembly(file);
-                    if (assemblyTypes == null)
-                    {
-                        continue;
-                    }
-
-                    types.AddRange(assemblyTypes);
-                }
-            }
-            
-            // Instantiate them.
-            foreach (var module in types)
-            {
-                EnsureLoaded(module);
+                types.AddRange(assemblyTypes);
             }
         }
             
-        /// <summary>
-        /// Loads the assembly and appends all Module types to list.
-        /// </summary>
-        /// <param name="path">The full path to assembly file</param>
-        /// <returns><see cref="IEnumerable{T}"/> if success, null otherwise.</returns>
-        private IEnumerable<Type>? LoadAssembly(string path)
+        // Instantiate them.
+        foreach (var module in types)
         {
-            var fileName = Path.GetFileNameWithoutExtension(path).ToString();
-            if (_ignoredAssemblyFilenames.Contains(fileName))
-            {
-                return null;
-            }
-
-            Assembly assembly;
-            try
-            {
-                assembly = Assembly.LoadFile(path);
-            }
-            catch (Exception)
-            {
-                // don't load any invalid module.
-                return null;
-            }
-
-            return assembly.GetExportedTypes().Where(x => !x.IsAbstract && x.IsSubclassOf(typeof(Module)));
-        }
-
-        /// <summary>
-        /// Ensures if module is loaded and started. Note that call can change module event chain.
-        /// </summary>
-        /// <typeparam name="T">The Module type.</typeparam>
-        /// <returns>Module instance.</returns>
-        public T EnsureLoaded<T>()
-            where T : Module
-        {
-            return (T) EnsureLoaded(typeof(T));
-        }
-        
-        /// <summary>
-        /// Ensures if module is loaded and started. Note that call can change module event chain.
-        /// </summary>
-        /// <param name="moduleType">The Module type.</param>
-        /// <returns>Module instance.</returns>
-        /// <exception cref="Exception">The given type is not extends the Module class</exception>
-        public Module EnsureLoaded(Type moduleType)
-        {
-            if (!moduleType.IsSubclassOf(typeof(Module)))
-            {
-                throw new Exception("Received incorrect module type");
-            }
-
-            var module = _modules.FirstOrDefault(module => module.GetType() == moduleType);
-            if (module == null)
-            {
-                module = (Module) Activator.CreateInstance(moduleType, this)!;
-                Console.WriteLine($"Started module {module.GetType().Name}");
-                _modules.Add(module);
-            }
-
-            return module;
-        }
-
-        private void HookAppDomain()
-        {
-            var appDomain = AppDomain.CurrentDomain;
-            
-            appDomain.AssemblyResolve += delegate(object? sender, ResolveEventArgs args)
-            {
-                var assemblyName = new AssemblyName(args.Name).Name + ".dll";
-
-                var possiblePaths = new List<string>();
-                if (args.RequestingAssembly != null)
-                {
-                    var modulePath = Path.GetDirectoryName(args.RequestingAssembly.Location)!;
-                    possiblePaths.Add(modulePath);
-                    possiblePaths.Add(args.RequestingAssembly.Location.Replace(".dll", ""));
-                }
-
-                possiblePaths.Add(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)!);
-                possiblePaths.Add(Environment.CurrentDirectory);
-
-                foreach (var basePath in possiblePaths)
-                {
-                    var assemblyPath = $"{basePath}/{assemblyName}";
-                    if (File.Exists(assemblyPath))
-                    {
-                        return Assembly.LoadFrom(assemblyPath);
-                    }
-                }
-
-                return null;
-            };
+            EnsureLoaded(module);
         }
     }
+
+    /// <summary>
+    /// Loads the assembly and appends all Module types to list.
+    /// </summary>
+    /// <param name="path">The full path to assembly file</param>
+    /// <returns><see cref="IEnumerable{T}"/> if success, null otherwise.</returns>
+    private IEnumerable<Type>? LoadAssembly(string path)
+    {
+        var fileName = Path.GetFileNameWithoutExtension(path).ToString();
+        if (_ignoredAssemblyFilenames.Contains(fileName))
+        {
+            return null;
+        }
+
+        Assembly assembly;
+        try
+        {
+            assembly = Assembly.LoadFile(path);
+        }
+        catch (Exception)
+        {
+            // don't load any invalid module.
+            return null;
+        }
+
+        return assembly.GetExportedTypes().Where(x => !x.IsAbstract && x.IsSubclassOf(typeof(Module)));
+    }
+
+    /// <summary>
+    /// Ensures if module is loaded and started. Note that call can change module event chain.
+    /// </summary>
+    /// <typeparam name="T">The Module type.</typeparam>
+    /// <returns>Module instance.</returns>
+    public T EnsureLoaded<T>()
+        where T : Module
+    {
+        return (T) EnsureLoaded(typeof(T));
+    }
+        
+    /// <summary>
+    /// Ensures if module is loaded and started. Note that call can change module event chain.
+    /// </summary>
+    /// <param name="moduleType">The Module type.</param>
+    /// <returns>Module instance.</returns>
+    /// <exception cref="Exception">The given type is not extends the Module class</exception>
+    public Module EnsureLoaded(Type moduleType)
+    {
+        if (!moduleType.IsSubclassOf(typeof(Module)))
+        {
+            throw new Exception("Received incorrect module type");
+        }
+
+        var module = _modules.FirstOrDefault(module => module.GetType() == moduleType);
+        if (module == null)
+        {
+            module = (Module) Activator.CreateInstance(moduleType, this)!;
+            Console.WriteLine($"Started module {module.GetType().Name}");
+            _modules.Add(module);
+        }
+
+        return module;
+    }
+
+    private void HookAppDomain()
+    {
+        var appDomain = AppDomain.CurrentDomain;
+            
+        appDomain.AssemblyResolve += delegate(object? sender, ResolveEventArgs args)
+        {
+            var assemblyName = new AssemblyName(args.Name).Name + ".dll";
+
+            var possiblePaths = new List<string>();
+            if (args.RequestingAssembly != null)
+            {
+                var modulePath = Path.GetDirectoryName(args.RequestingAssembly.Location)!;
+                possiblePaths.Add(modulePath);
+                possiblePaths.Add(args.RequestingAssembly.Location.Replace(".dll", ""));
+            }
+
+            possiblePaths.Add(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)!);
+            possiblePaths.Add(Environment.CurrentDirectory);
+
+            foreach (var basePath in possiblePaths)
+            {
+                var assemblyPath = $"{basePath}/{assemblyName}";
+                if (File.Exists(assemblyPath))
+                {
+                    return Assembly.LoadFrom(assemblyPath);
+                }
+            }
+
+            return null;
+        };
+    }
 }

Core/Data/BotUser.cs

@@ -1,24 +1,23 @@
 using System;
 using System.ComponentModel.DataAnnotations;
 
-namespace Kruzya.TelegramBot.Core.Data
+namespace Kruzya.TelegramBot.Core.Data;
+
+public class BotUser
 {
-    public class BotUser
-    {
-        /// <summary>
-        /// The unique bot user identifier.
-        /// </summary>
-        [Key]
-        public Guid BotUserId { get; set; }
+    /// <summary>
+    /// The unique bot user identifier.
+    /// </summary>
+    [Key]
+    public Guid BotUserId { get; set; }
         
-        /// <summary>
-        /// The chat identifier where this user is related.
-        /// </summary>
-        public long ChatId { get; set; }
+    /// <summary>
+    /// The chat identifier where this user is related.
+    /// </summary>
+    public long ChatId { get; set; }
 
-        /// <summary>
-        /// The Telegram User identifier.
-        /// </summary>
-        public long UserId { get; set; }
-    }
+    /// <summary>
+    /// The Telegram User identifier.
+    /// </summary>
+    public long UserId { get; set; }
 }

Core/Data/BotUserValue.cs

@@ -4,38 +4,37 @@ using System.ComponentModel.DataAnnotations.Schema;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
-namespace Kruzya.TelegramBot.Core.Data
+namespace Kruzya.TelegramBot.Core.Data;
+
+public class BotUserValue
 {
-    public class BotUserValue
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    [Key]
+    public Guid BotUserValueId { get; set; }
+        
+    public BotUser BotUser { get; set; }
+    public string Name { get; set; }
+        
+    public string ValueType { get; set; }
+
+    public byte[] Value { get; set; }
+
+    public T GetValue<T>(T defVal = default)
     {
-        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
-        [Key]
-        public Guid BotUserValueId { get; set; }
-        
-        public BotUser BotUser { get; set; }
-        public string Name { get; set; }
-        
-        public string ValueType { get; set; }
-
-        public byte[] Value { get; set; }
-
-        public T GetValue<T>(T defVal = default)
+        try
         {
-            try
-            {
-                return JsonSerializer.Deserialize<T>(new ReadOnlySpan<byte>(Value));
-            }
-            catch (Exception)
-            {
-                return defVal;
-            }
+            return JsonSerializer.Deserialize<T>(new ReadOnlySpan<byte>(Value));
         }
-
-        public void SetValue<T>(T value)
+        catch (Exception)
         {
-            Value = JsonSerializer.SerializeToUtf8Bytes(value, new JsonSerializerOptions { WriteIndented = false, 
-                DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull });
-            ValueType = value.GetType().FullName;
+            return defVal;
         }
     }
+
+    public void SetValue<T>(T value)
+    {
+        Value = JsonSerializer.SerializeToUtf8Bytes(value, new JsonSerializerOptions { WriteIndented = false, 
+            DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull });
+        ValueType = value.GetType().FullName;
+    }
 }

Core/Data/CoreContext.cs

@@ -1,25 +1,24 @@
 using Kruzya.TelegramBot.Core.EF;
 using Microsoft.EntityFrameworkCore;
 
-namespace Kruzya.TelegramBot.Core.Data
+namespace Kruzya.TelegramBot.Core.Data;
+
+public class CoreContext : AutoSaveDbContext
 {
-    public class CoreContext : AutoSaveDbContext
+    /// <summary>
+    /// The all known users.
+    /// </summary>
+    public DbSet<BotUser> Users { get; set; }
+
+    /// <summary>
+    /// The all knows user options and values.
+    /// </summary>
+    public DbSet<BotUserValue> UserValues { get; set; }
+
+    public DbSet<ChatOptionValue> ChatOptionValues { get; set; }
+
+    public CoreContext(DbContextOptions<CoreContext> ctx) : base(ctx)
     {
-        /// <summary>
-        /// The all known users.
-        /// </summary>
-        public DbSet<BotUser> Users { get; set; }
-
-        /// <summary>
-        /// The all knows user options and values.
-        /// </summary>
-        public DbSet<BotUserValue> UserValues { get; set; }
-
-        public DbSet<ChatOptionValue> ChatOptionValues { get; set; }
-
-        public CoreContext(DbContextOptions<CoreContext> ctx) : base(ctx)
-        {
-            Database.Migrate();
-        }
+        Database.Migrate();
     }
 }

Core/DbResolverParameter.cs

@@ -2,40 +2,39 @@
 using BotFramework;
 using Microsoft.EntityFrameworkCore;
 
-namespace Kruzya.TelegramBot.Core
+namespace Kruzya.TelegramBot.Core;
+
+/// <summary>
+/// Resolves the GUIDs from database to entities.
+/// </summary>
+/// <typeparam name="TResolvedEntity">Entity type</typeparam>
+/// <typeparam name="TAppContext">Database context where entity should be finded</typeparam>
+public class DbResolverParameter<TResolvedEntity, TAppContext> : IParameterParser<TResolvedEntity>
+    where TAppContext : DbContext
+    where TResolvedEntity : class
 {
-    /// <summary>
-    /// Resolves the GUIDs from database to entities.
-    /// </summary>
-    /// <typeparam name="TResolvedEntity">Entity type</typeparam>
-    /// <typeparam name="TAppContext">Database context where entity should be finded</typeparam>
-    public class DbResolverParameter<TResolvedEntity, TAppContext> : IParameterParser<TResolvedEntity>
-        where TAppContext : DbContext
-        where TResolvedEntity : class
+    private TAppContext _dbContext;
+
+    public DbResolverParameter(TAppContext dbContext)
     {
-        private TAppContext _dbContext;
+        _dbContext = dbContext;
+    }
         
-        public DbResolverParameter(TAppContext dbContext)
+    public TResolvedEntity DefaultInstance()
+    {
+        return default(TResolvedEntity);
+    }
+
+    public bool TryGetValue(string text, out TResolvedEntity result)
+    {
+        result = null;
+        Guid id;
+        if (Guid.TryParse(text, out id))
         {
-            _dbContext = dbContext;
+            result = _dbContext.Find<TResolvedEntity>(id);
+            return (result != null);
         }
 
-        public TResolvedEntity DefaultInstance()
-        {
-            return default(TResolvedEntity);
-        }
-
-        public bool TryGetValue(string text, out TResolvedEntity result)
-        {
-            result = null;
-            Guid id;
-            if (Guid.TryParse(text, out id))
-            {
-                result = _dbContext.Find<TResolvedEntity>(id);
-                return (result != null);
-            }
-
-            return false;
-        }
+        return false;
     }
 }

Core/Extensions/BotExtension.cs

@@ -2,45 +2,44 @@
 using Telegram.Bot;
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.Core.Extensions
+namespace Kruzya.TelegramBot.Core.Extensions;
+
+public static class BotExtension
 {
-    public static class BotExtension
+    public static async Task<bool> CanPunishMember(this ITelegramBotClient bot, Chat chat, User user, User victim = null)
     {
-        public static async Task<bool> CanPunishMember(this ITelegramBotClient bot, Chat chat, User user, User victim = null)
+        var canUse = await IsUserAdminAsync(bot, chat, user);
+
+        if (victim != null && canUse)
         {
-            var canUse = await IsUserAdminAsync(bot, chat, user);
-
-            if (victim != null && canUse)
-            {
-                var victimMember = await bot.GetChatMemberAsync(chat, victim.Id);
-                canUse = victimMember is not ChatMemberOwner && victimMember is not ChatMemberAdministrator && !victim.IsBot;
-            }
-
-            return canUse;
+            var victimMember = await bot.GetChatMemberAsync(chat, victim.Id);
+            canUse = victimMember is not ChatMemberOwner && victimMember is not ChatMemberAdministrator && !victim.IsBot;
         }
 
-        public static async Task<bool> IsUserAdminAsync(this ITelegramBotClient bot, Chat chat, User user)
+        return canUse;
+    }
+
+    public static async Task<bool> IsUserAdminAsync(this ITelegramBotClient bot, Chat chat, User user)
+    {
+        var callerMember = await bot.GetChatMemberAsync(chat, user.Id);
+        var isAdmin = callerMember is ChatMemberOwner;
+
+        if (callerMember is ChatMemberAdministrator callerAdmin)
         {
-            var callerMember = await bot.GetChatMemberAsync(chat, user.Id);
-            var isAdmin = callerMember is ChatMemberOwner;
-
-            if (callerMember is ChatMemberAdministrator callerAdmin)
-            {
-                isAdmin = callerAdmin.CanRestrictMembers;
-            }
-
-            return isAdmin;
+            isAdmin = callerAdmin.CanRestrictMembers;
         }
 
-        public static async Task<bool> CanDeleteMessagesAsync(this ITelegramBotClient bot, Chat chat)
-        {
-            return await CanDeleteMessagesAsync(bot, chat, await bot.GetMeAsync());
-        }
+        return isAdmin;
+    }
 
-        public static async Task<bool> CanDeleteMessagesAsync(this ITelegramBotClient bot, Chat chat, User user)
-        {
-            return await bot.GetChatMemberAsync(chat.Id, user.Id) is ChatMemberOwner 
-                or ChatMemberAdministrator {CanRestrictMembers: true};
-        }
+    public static async Task<bool> CanDeleteMessagesAsync(this ITelegramBotClient bot, Chat chat)
+    {
+        return await CanDeleteMessagesAsync(bot, chat, await bot.GetMeAsync());
+    }
+
+    public static async Task<bool> CanDeleteMessagesAsync(this ITelegramBotClient bot, Chat chat, User user)
+    {
+        return await bot.GetChatMemberAsync(chat.Id, user.Id) is ChatMemberOwner 
+            or ChatMemberAdministrator {CanRestrictMembers: true};
     }
 }

Core/Extensions/HttpClientExtension.cs

@@ -3,20 +3,19 @@ using System.Net.Http;
 using System.Threading.Tasks;
 using Newtonsoft.Json;
 
-namespace Kruzya.TelegramBot.Core.Extensions
-{
-    public static class HttpClientExtension
-    {
-        public static async Task<T> GetJsonAsync<T>(this HttpClient client, Uri requestUri)
-        {
-            var response = await client.GetStringAsync(requestUri);
-            return JsonConvert.DeserializeObject<T>(response);
-        }
+namespace Kruzya.TelegramBot.Core.Extensions;
 
-        public static async Task<T> GetJsonAsync<T>(this HttpClient client, string requestUri)
-        {
-            var response = await client.GetStringAsync(requestUri);
-            return JsonConvert.DeserializeObject<T>(response);
-        }
+public static class HttpClientExtension
+{
+    public static async Task<T> GetJsonAsync<T>(this HttpClient client, Uri requestUri)
+    {
+        var response = await client.GetStringAsync(requestUri);
+        return JsonConvert.DeserializeObject<T>(response);
+    }
+
+    public static async Task<T> GetJsonAsync<T>(this HttpClient client, string requestUri)
+    {
+        var response = await client.GetStringAsync(requestUri);
+        return JsonConvert.DeserializeObject<T>(response);
     }
 }

Core/Extensions/ModuleArrayExtension.cs

@@ -2,18 +2,17 @@
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.DependencyInjection;
 
-namespace Kruzya.TelegramBot.Core.Extensions
-{
-    internal static class ModuleArrayExtension
-    {
-        public static void ConfigureServices(this Module[] modules, IServiceCollection services)
-        {
-            foreach (var module in modules) module.ConfigureServices(services);
-        }
+namespace Kruzya.TelegramBot.Core.Extensions;
 
-        public static void Configure(this Module[] modules, IApplicationBuilder app, IWebHostEnvironment env)
-        {
-            foreach (var module in modules) module.Configure(app, env);
-        }
+internal static class ModuleArrayExtension
+{
+    public static void ConfigureServices(this Module[] modules, IServiceCollection services)
+    {
+        foreach (var module in modules) module.ConfigureServices(services);
+    }
+
+    public static void Configure(this Module[] modules, IApplicationBuilder app, IWebHostEnvironment env)
+    {
+        foreach (var module in modules) module.Configure(app, env);
     }
 }

Core/Extensions/RepositoryExtension.cs

@@ -1,15 +1,14 @@
 using Microsoft.EntityFrameworkCore;
 
-namespace Kruzya.TelegramBot.Core.Extensions
-{
-    public static partial class RepositoryExtension
-    {
-        public static TEntity Create<TEntity>(this DbSet<TEntity> repository) where TEntity : class, new()
-        {
-            var entity = new TEntity();
-            repository.Add(entity);
+namespace Kruzya.TelegramBot.Core.Extensions;
 
-            return entity;
-        }
+public static partial class RepositoryExtension
+{
+    public static TEntity Create<TEntity>(this DbSet<TEntity> repository) where TEntity : class, new()
+    {
+        var entity = new TEntity();
+        repository.Add(entity);
+
+        return entity;
     }
 }

Core/Extensions/StringExtension.cs

@@ -1,17 +1,16 @@
 using System.Web;
 
-namespace Kruzya.TelegramBot.Core.Extensions
-{
-    public static class StringExtension
-    {
-        public static string HtmlEncode(this string content)
-        {
-            return HttpUtility.HtmlEncode(content);
-        }
+namespace Kruzya.TelegramBot.Core.Extensions;
 
-        public static string HtmlDecode(this string content)
-        {
-            return HttpUtility.HtmlDecode(content);
-        }
+public static class StringExtension
+{
+    public static string HtmlEncode(this string content)
+    {
+        return HttpUtility.HtmlEncode(content);
+    }
+
+    public static string HtmlDecode(this string content)
+    {
+        return HttpUtility.HtmlDecode(content);
     }
 }

Core/Extensions/UserExtension.cs

@@ -1,31 +1,30 @@
 using System.Text;
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.Core.Extensions
+namespace Kruzya.TelegramBot.Core.Extensions;
+
+public static class UserExtension
 {
-    public static class UserExtension
+    public static string ToHtml(this User user, bool byUsername = false)
     {
-        public static string ToHtml(this User user, bool byUsername = false)
+        var text = new StringBuilder();
+        text.Append($"<a href=\"tg://user?id={user.Id}\">");
+           
+        if (byUsername && !string.IsNullOrWhiteSpace(user.Username))
         {
-            var text = new StringBuilder();
-            text.Append($"<a href=\"tg://user?id={user.Id}\">");
-           
-            if (byUsername && !string.IsNullOrWhiteSpace(user.Username))
-            {
-                text.Append(user.Username);
-            }
-            else
-            {
-                text.Append($"{user.FirstName} {user.LastName}".Trim().HtmlEncode());
-            }
-            return text.Append("</a>").ToString();
+            text.Append(user.Username);
         }
-
-        public static string ToLog(this User user)
+        else
         {
-            var name = $"{user.FirstName} {user.LastName}".Trim();
-
-            return $"{name} (ID: {user.Id}, Username: {user.Username ?? "N/A"})";
+            text.Append($"{user.FirstName} {user.LastName}".Trim().HtmlEncode());
         }
+        return text.Append("</a>").ToString();
+    }
+
+    public static string ToLog(this User user)
+    {
+        var name = $"{user.FirstName} {user.LastName}".Trim();
+
+        return $"{name} (ID: {user.Id}, Username: {user.Username ?? "N/A"})";
     }
 }

Core/Handler/CommonHandler.cs

@@ -9,54 +9,53 @@ using Telegram.Bot;
 using Telegram.Bot.Types;
 using Telegram.Bot.Types.Enums;
 
-namespace Kruzya.TelegramBot.Core.Handler
+namespace Kruzya.TelegramBot.Core.Handler;
+
+public abstract class CommonHandler : BotEventHandler
 {
-    public abstract class CommonHandler : BotEventHandler
+    protected readonly CoreContext Db;
+
+    protected Message? Message => RawUpdate.Message;
+
+    protected User? RepliedUser => Message?.ReplyToMessage?.From;
+
+    protected CommonHandler(CoreContext db)
     {
-        protected readonly CoreContext Db;
+        Db = db;
+    }
 
-        protected Message? Message => RawUpdate.Message;
+    protected virtual async Task<Message> Reply(string text)
+    {
+        return await Bot.SendTextMessageAsync(Chat.Id, text,
+            replyToMessageId: Message?.MessageId, parseMode: ParseMode.Html);
+    }
 
-        protected User? RepliedUser => Message?.ReplyToMessage?.From;
-
-        protected CommonHandler(CoreContext db)
-        {
-            Db = db;
-        }
-
-        protected virtual async Task<Message> Reply(string text)
-        {
-            return await Bot.SendTextMessageAsync(Chat.Id, text,
-                replyToMessageId: Message?.MessageId, parseMode: ParseMode.Html);
-        }
-
-        protected async Task<bool> CanPunish()
-        {
-            return RepliedUser != null && await Bot.CanPunishMember(Chat, From, RepliedUser);
-        }
+    protected async Task<bool> CanPunish()
+    {
+        return RepliedUser != null && await Bot.CanPunishMember(Chat, From, RepliedUser);
+    }
 
 
-        protected async Task BanMember(long userId, DateTime banEnd)
-        {
-            await Bot.RestrictChatMemberAsync(
-                                Chat.Id,
-                                userId,
-                                new ChatPermissions
-                                {
-                                    CanSendMessages = false
-                                },
-                                banEnd
-                                );
-        }
+    protected async Task BanMember(long userId, DateTime banEnd)
+    {
+        await Bot.RestrictChatMemberAsync(
+            Chat.Id,
+            userId,
+            new ChatPermissions
+            {
+                CanSendMessages = false
+            },
+            banEnd
+        );
+    }
 
-        protected async Task<BotUserValue> GetWarnOption(User user)
-        {
-            return await Db.UserValues.FindOrCreateOption(Chat.Id, user.Id, "warnCount");
-        }
+    protected async Task<BotUserValue> GetWarnOption(User user)
+    {
+        return await Db.UserValues.FindOrCreateOption(Chat.Id, user.Id, "warnCount");
+    }
 
-        protected async Task AnswerQuery(string id, string? message = null)
-        {
-            await Bot.AnswerCallbackQueryAsync(id, message);
-        }
+    protected async Task AnswerQuery(string id, string? message = null)
+    {
+        await Bot.AnswerCallbackQueryAsync(id, message);
     }
 }

Core/Handler/GeneralHandler.cs

@@ -6,71 +6,70 @@ using Kruzya.TelegramBot.Core.Data;
 using Microsoft.EntityFrameworkCore;
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.Core.Handler
+namespace Kruzya.TelegramBot.Core.Handler;
+
+public class GeneralHandler : BotEventHandler
 {
-    public class GeneralHandler : BotEventHandler
+    [AttributeUsage(AttributeTargets.Method)]
+    public sealed class HandleEverythingAttribute : HandlerAttribute
     {
-        [AttributeUsage(AttributeTargets.Method)]
-        public sealed class HandleEverythingAttribute : HandlerAttribute
+        protected override bool CanHandle(HandlerParams param)
         {
-            protected override bool CanHandle(HandlerParams param)
-            {
-                return true;
-            }
-        }
-
-        protected readonly CoreContext databaseContext;
-
-        public GeneralHandler(CoreContext dbCtx)
-        {
-            databaseContext = dbCtx;
-        }
-
-        [HandleEverything]
-        [Priority(short.MaxValue - 10)]
-        public async Task<bool> Listener()
-        {
-            foreach (var message in new Message[] { RawUpdate.Message, RawUpdate.EditedMessage, RawUpdate.ChannelPost, RawUpdate.EditedChannelPost })
-            {
-                if (message == null)
-                {
-                    continue;
-                }
-
-                await VerifyChatPair(message);
-            }
-
             return true;
         }
+    }
 
-        public async Task VerifyChatPair(Message message)
-        {
-            await VerifyChatPair(message.Chat, message.From);
-        }
+    protected readonly CoreContext databaseContext;
 
-        public async Task VerifyChatPair(Chat chat, User user)
-        {
-            await VerifyChatPair(chat.Id, user.Id);
-        }
+    public GeneralHandler(CoreContext dbCtx)
+    {
+        databaseContext = dbCtx;
+    }
 
-        public async Task VerifyChatPair(long chat, long user)
+    [HandleEverything]
+    [Priority(short.MaxValue - 10)]
+    public async Task<bool> Listener()
+    {
+        foreach (var message in new Message[] { RawUpdate.Message, RawUpdate.EditedMessage, RawUpdate.ChannelPost, RawUpdate.EditedChannelPost })
         {
-            var hasEntry = await databaseContext.Users.AnyAsync(e => e.ChatId == chat && e.UserId == user);
-            if (hasEntry)
+            if (message == null)
             {
-                return;
+                continue;
             }
 
-            await MakeChatPair(chat, user);
+            await VerifyChatPair(message);
         }
 
-        public async Task MakeChatPair(long chat, long user)
+        return true;
+    }
+
+    public async Task VerifyChatPair(Message message)
+    {
+        await VerifyChatPair(message.Chat, message.From);
+    }
+
+    public async Task VerifyChatPair(Chat chat, User user)
+    {
+        await VerifyChatPair(chat.Id, user.Id);
+    }
+
+    public async Task VerifyChatPair(long chat, long user)
+    {
+        var hasEntry = await databaseContext.Users.AnyAsync(e => e.ChatId == chat && e.UserId == user);
+        if (hasEntry)
         {
-            await databaseContext.Users.AddAsync(new BotUser()
-            {
-                ChatId = chat,
-                UserId = user
-            });
+            return;
         }
+
+        await MakeChatPair(chat, user);
+    }
+
+    public async Task MakeChatPair(long chat, long user)
+    {
+        await databaseContext.Users.AddAsync(new BotUser()
+        {
+            ChatId = chat,
+            UserId = user
+        });
     }
 }

Core/Module.cs

@@ -3,34 +3,33 @@ using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 
-namespace Kruzya.TelegramBot.Core
+namespace Kruzya.TelegramBot.Core;
+
+public abstract class Module
 {
-    public abstract class Module
+    protected readonly Core Core;
+    protected IConfiguration Configuration => Core.Configuration;
+        
+    public Module(Core core)
     {
-        protected readonly Core Core;
-        protected IConfiguration Configuration => Core.Configuration;
+        Core = core;
+    }
 
-        public Module(Core core)
-        {
-            Core = core;
-        }
+    public virtual void ConfigureServices(IServiceCollection services)
+    {
+    }
 
-        public virtual void ConfigureServices(IServiceCollection services)
-        {
-        }
+    public virtual void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+    {
+    }
         
-        public virtual void Configure(IApplicationBuilder app, IWebHostEnvironment env)
-        {
-        }
-        
-        /// <summary>
-        /// Ensures if module is loaded and started. Note that call can change module event chain.
-        /// </summary>
-        /// <typeparam name="T">The Module type.</typeparam>
-        /// <returns>Module instance.</returns>
-        protected T EnsureLoaded<T>() where T : Module
-        {
-            return (T) Core.EnsureLoaded(typeof(T));
-        }
+    /// <summary>
+    /// Ensures if module is loaded and started. Note that call can change module event chain.
+    /// </summary>
+    /// <typeparam name="T">The Module type.</typeparam>
+    /// <returns>Module instance.</returns>
+    protected T EnsureLoaded<T>() where T : Module
+    {
+        return (T) Core.EnsureLoaded(typeof(T));
     }
 }

Core/Program.cs

@@ -2,19 +2,18 @@ using System.Globalization;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Hosting;
 
-namespace Kruzya.TelegramBot.Core
-{
-    public class Program
-    {
-        public static void Main(string[] args)
-        {
-            CultureInfo.CurrentCulture = new CultureInfo("ru-RU");
-            CreateHostBuilder(args).Build().Run();
-        }
+namespace Kruzya.TelegramBot.Core;
 
-        public static IHostBuilder CreateHostBuilder(string[] args) =>
-            Host.CreateDefaultBuilder(args)
-                .UseSystemd()
-                .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); });
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        CultureInfo.CurrentCulture = new CultureInfo("ru-RU");
+        CreateHostBuilder(args).Build().Run();
     }
+
+    public static IHostBuilder CreateHostBuilder(string[] args) =>
+        Host.CreateDefaultBuilder(args)
+            .UseSystemd()
+            .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); });
 }

Core/Service/AbstractTimedHostedService.cs

@@ -5,70 +5,69 @@ using BotFramework.Abstractions;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 
-namespace Kruzya.TelegramBot.Core.Service
+namespace Kruzya.TelegramBot.Core.Service;
+
+public abstract class AbstractTimedHostedService : IHostedService, IDisposable
 {
-    public abstract class AbstractTimedHostedService : IHostedService, IDisposable
+    private Timer _timer;
+        
+    protected readonly ILogger _logger;
+    protected readonly IBotInstance _bot;
+        
+    protected virtual TimeSpan TimerPeriod => TimeSpan.FromSeconds(45);
+
+    protected AbstractTimedHostedService(ILogger logger, IBotInstance bot)
     {
-        private Timer _timer;
+        _bot = bot;
+        _logger = logger;
+    }
 
-        protected readonly ILogger _logger;
-        protected readonly IBotInstance _bot;
+    #region IHostedService
 
-        protected virtual TimeSpan TimerPeriod => TimeSpan.FromSeconds(45);
+    public Task StartAsync(CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("Message sender service is starting.");
+        _timer = new Timer(Run, null, TimeSpan.Zero, TimerPeriod);
 
-        protected AbstractTimedHostedService(ILogger logger, IBotInstance bot)
+        return Task.CompletedTask;
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("Message sender service is stopping.");
+        _timer?.Change(Timeout.Infinite, 0);
+
+        return Task.CompletedTask;
+    }
+        
+    #endregion
+    #region IDisposable
+    /// <summary>
+    /// Disposes the timer.
+    /// </summary>
+    public void Dispose()
+    {
+        _timer?.Dispose();
+    }
+    #endregion
+
+    private async void Run(object state)
+    {
+        _timer?.Change(Timeout.Infinite, 0);
+
+        try
         {
-            _bot = bot;
-            _logger = logger;
+            await OnRun();
         }
-
-        #region IHostedService
-
-        public Task StartAsync(CancellationToken cancellationToken)
+        finally
         {
-            _logger.LogInformation("Message sender service is starting.");
-            _timer = new Timer(Run, null, TimeSpan.Zero, TimerPeriod);
-
-            return Task.CompletedTask;
-        }
-
-        public Task StopAsync(CancellationToken cancellationToken)
-        {
-            _logger.LogInformation("Message sender service is stopping.");
-            _timer?.Change(Timeout.Infinite, 0);
-
-            return Task.CompletedTask;
-        }
-        
-        #endregion
-        #region IDisposable
-        /// <summary>
-        /// Disposes the timer.
-        /// </summary>
-        public void Dispose()
-        {
-            _timer?.Dispose();
-        }
-        #endregion
-
-        private async void Run(object state)
-        {
-            _timer?.Change(Timeout.Infinite, 0);
-
-            try
-            {
-                await OnRun();
-            }
-            finally
-            {
-                var timerPeriod = TimerPeriod;
-                _timer?.Change(timerPeriod, timerPeriod);
-            }
-        }
-        
-        protected virtual async Task OnRun()
-        {
-            await Task.Delay(500);
+            var timerPeriod = TimerPeriod;
+            _timer?.Change(timerPeriod, timerPeriod);
         }
     }
+        
+    protected virtual async Task OnRun()
+    {
+        await Task.Delay(500);
+    }
 }

Core/Service/IReputation.cs

@@ -3,14 +3,13 @@ using System.Threading.Tasks;
 using Kruzya.TelegramBot.Core.Data;
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.Core.Service
+namespace Kruzya.TelegramBot.Core.Service;
+
+public interface IReputation
 {
-    public interface IReputation
-    {
-        public Task<double> GetUserReputationAsync(Chat chat, User user);
-        public Task<double> SetUserReputationAsync(Chat chat, User user, double value);
-        public Task<double> GetReputationDiffAsync(Chat chat, User sender, User receiver);
-        public Task<double> IncrementReputationAsync(Chat chat, User user, double diff);
-        public Task<IEnumerable<IReputationEntity>> GetChatRatingAsync(Chat chat, int limit = 10, int offset = 0);
-    }
+    public Task<double> GetUserReputationAsync(Chat chat, User user);
+    public Task<double> SetUserReputationAsync(Chat chat, User user, double value);
+    public Task<double> GetReputationDiffAsync(Chat chat, User sender, User receiver);
+    public Task<double> IncrementReputationAsync(Chat chat, User user, double diff);
+    public Task<IEnumerable<IReputationEntity>> GetChatRatingAsync(Chat chat, int limit = 10, int offset = 0);
 }

Core/Service/UserService.cs

@@ -11,81 +11,80 @@ using Microsoft.Extensions.Logging;
 using Telegram.Bot;
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.Core.Service
+namespace Kruzya.TelegramBot.Core.Service;
+
+public class UserService
 {
-    public class UserService
+    private readonly List<long> _superUsers;
+    private readonly Dictionary<long, string> _statusMap;
+    private readonly ICacheStorage<long, User> _userCache;
+    private readonly ITelegramBotClient _bot;
+    private readonly ILogger<UserService> _logger;
+
+
+    public UserService(
+        IConfiguration configuration, 
+        IBotInstance bot, 
+        ICacheStorage<long, User> userCache,
+        ILogger<UserService> logger)
     {
-        private readonly List<long> _superUsers;
-        private readonly Dictionary<long, string> _statusMap;
-        private readonly ICacheStorage<long, User> _userCache;
-        private readonly ITelegramBotClient _bot;
-        private readonly ILogger<UserService> _logger;
+        _superUsers = configuration.GetSection("SuperUsers")
+            .GetChildren()
+            .Select(q => Convert.ToInt64(q.Value))
+            .ToList();
 
+        _statusMap = configuration.GetSection("CustomMemberStatus")
+            .GetChildren()
+            .ToDictionary(x => Convert.ToInt64(x.Key), x => x.Value);
 
-        public UserService(
-            IConfiguration configuration, 
-            IBotInstance bot, 
-            ICacheStorage<long, User> userCache,
-            ILogger<UserService> logger)
+        _userCache = userCache;
+        _bot = bot.BotClient;
+        _logger = logger;
+    }
+
+    public async Task<User> GetUser(long userId, long chatId, bool bypassCache = false)
+    {
+        if (bypassCache || !_userCache.TryGetValue(userId, out var user))
         {
-            _superUsers = configuration.GetSection("SuperUsers")
-                .GetChildren()
-                .Select(q => Convert.ToInt64(q.Value))
-                .ToList();
-
-            _statusMap = configuration.GetSection("CustomMemberStatus")
-                .GetChildren()
-                .ToDictionary(x => Convert.ToInt64(x.Key), x => x.Value);
-
-            _userCache = userCache;
-            _bot = bot.BotClient;
-            _logger = logger;
-        }
-
-        public async Task<User> GetUser(long userId, long chatId, bool bypassCache = false)
-        {
-            if (bypassCache || !_userCache.TryGetValue(userId, out var user))
+            if (bypassCache)
             {
-                if (bypassCache)
-                {
-                    _logger.LogDebug("Bypassing cache for {UserId}.", userId);
-                }
-                else
-                {
-                    _logger.LogDebug("User {UserId} is not found in cache. Fetching from Telegram API.", userId);
-                }
-
-                user = await GetUserByChat(chatId, userId);
-                CacheUser(user);
+                _logger.LogDebug("Bypassing cache for {UserId}.", userId);
+            }
+            else
+            {
+                _logger.LogDebug("User {UserId} is not found in cache. Fetching from Telegram API.", userId);
             }
 
-            return user;
+            user = await GetUserByChat(chatId, userId);
+            CacheUser(user);
         }
          
-        private void CacheUser(User user)
-        {
-            // TODO: config entry for TTL
-            _userCache.SetValue(user.Id, user, Convert.ToInt32(TimeSpan.FromHours(1).TotalSeconds));
-        }
+        return user;
+    }
 
-        private async Task<User> GetUserByChat(long chatId, long userId)
-        {
-            return (await _bot.GetChatMemberAsync(chatId, userId)).User;
-        }
+    private void CacheUser(User user)
+    {
+        // TODO: config entry for TTL
+        _userCache.SetValue(user.Id, user, Convert.ToInt32(TimeSpan.FromHours(1).TotalSeconds));
+    }
         
-        public bool IsUserSuper(User user)
-        {
-            return IsUserSuper(user.Id);
-        }
+    private async Task<User> GetUserByChat(long chatId, long userId)
+    {
+        return (await _bot.GetChatMemberAsync(chatId, userId)).User;
+    }
 
-        public bool IsUserSuper(long userId)
-        {
-            return _superUsers.Contains(userId);
-        }
+    public bool IsUserSuper(User user)
+    {
+        return IsUserSuper(user.Id);
+    }
         
-        public string? GetUserCustomStatus(long userId)
-        {
-            return _statusMap.ContainsKey(userId) ? _statusMap[userId] : null;
-        }
+    public bool IsUserSuper(long userId)
+    {
+        return _superUsers.Contains(userId);
+    }
+
+    public string? GetUserCustomStatus(long userId)
+    {
+        return _statusMap.ContainsKey(userId) ? _statusMap[userId] : null;
     }
 }

Core/Startup.cs

@@ -14,57 +14,56 @@ using System.Collections.Concurrent;
 using Kruzya.TelegramBot.Core.Options;
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.Core
+namespace Kruzya.TelegramBot.Core;
+
+public class Startup
 {
-    public class Startup
+    private Core _core;
+        
+    public Startup(IConfiguration configuration)
     {
-        private Core _core;
+        // TODO: add Core to DI.
+        _core = new Core(configuration);
+    }
         
-        public Startup(IConfiguration configuration)
-        {
-            // TODO: add Core to DI.
-            _core = new Core(configuration);
-        }
+    // This method gets called by the runtime. Use this method to add services to the container.
+    // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
+    public void ConfigureServices(IServiceCollection services)
+    {
+        services.AddTelegramBot();
+        services.AddLogging(builder => builder.AddConsole());
             
-        // This method gets called by the runtime. Use this method to add services to the container.
-        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
-        public void ConfigureServices(IServiceCollection services)
-        {
-            services.AddTelegramBot();
-            services.AddLogging(builder => builder.AddConsole());
+        // Add all modules to DI with Core instance.
+        services.AddSingleton<Core>(_core);
+        foreach (var module in _core.Modules) services.AddSingleton(module.GetType(), module);
 
-            // Add all modules to DI with Core instance.
-            services.AddSingleton<Core>(_core);
-            foreach (var module in _core.Modules) services.AddSingleton(module.GetType(), module);
+        // Add database context to DI.
+        var connectionString = _core.Configuration.GetConnectionString("DefaultConnection");
+        services.AddDbContext<CoreContext>(ctx =>
+            ctx.UseMySql(connectionString, ServerVersion.AutoDetect(connectionString)));
 
-            // Add database context to DI.
-            var connectionString = _core.Configuration.GetConnectionString("DefaultConnection");
-            services.AddDbContext<CoreContext>(ctx =>
-                ctx.UseMySql(connectionString, ServerVersion.AutoDetect(connectionString)));
+        // Cache for users.
+        services.AddSingleton<ICacheStorage<long, User>, MemoryCache<long, User>>();
 
-            // Cache for users.
-            services.AddSingleton<ICacheStorage<long, User>, MemoryCache<long, User>>();
+        services.AddSingleton<UserService>();
+        services.AddSingleton<IAntiFlood, MemoryAntiFloodService>();
 
-            services.AddSingleton<UserService>();
-            services.AddSingleton<IAntiFlood, MemoryAntiFloodService>();
-
-            services.AddSingleton<ThreadSafeRandom>();
+        services.AddSingleton<ThreadSafeRandom>();
 
 
-            services.AddSingleton<ConcurrentBag<DeleteRequest>>();
-            services.AddHostedService<DeleteService>();
+        services.AddSingleton<ConcurrentBag<DeleteRequest>>();
+        services.AddHostedService<DeleteService>();
 
-            services.AddScoped<IOptionProvider, DbOptionProvider>();
-            services.AddHttpClient();
+        services.AddScoped<IOptionProvider, DbOptionProvider>();
+        services.AddHttpClient();
 
-            // Trigger module handlers.
-            _core.Modules.ConfigureServices(services);
-        }
+        // Trigger module handlers.
+        _core.Modules.ConfigureServices(services);
+    }
 
-        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
-        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
-        {
-            _core.Modules.Configure(app, env);
-        }
+    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+    {
+        _core.Modules.Configure(app, env);
     }
 }

modules/ChatQuotes/ChatQuotes.cs

@@ -6,27 +6,26 @@ using Newtonsoft.Json.Converters;
 using Newtonsoft.Json.Serialization;
 using West.TelegramBot.ChatQuotes.Json;
 
-namespace West.TelegramBot.ChatQuotes
+namespace West.TelegramBot.ChatQuotes;
+
+public class ChatQuotes : Module
 {
-    public class ChatQuotes : Module
+    public static readonly JsonSerializerSettings SerializerSettings = new()
     {
-        public static readonly JsonSerializerSettings SerializerSettings = new()
+        MetadataPropertyHandling = MetadataPropertyHandling.Ignore,
+        DateParseHandling = DateParseHandling.None,
+        Converters =
         {
-            MetadataPropertyHandling = MetadataPropertyHandling.Ignore,
-            DateParseHandling = DateParseHandling.None,
-            Converters =
-            {
-                new IsoDateTimeConverter { DateTimeStyles = DateTimeStyles.AssumeUniversal },
-                new StringEnumConverter(new CamelCaseNamingStrategy())
-            },
-            ContractResolver = new NullToEmptyObjectResolver()
-        };
+            new IsoDateTimeConverter { DateTimeStyles = DateTimeStyles.AssumeUniversal },
+            new StringEnumConverter(new CamelCaseNamingStrategy())
+        },
+        ContractResolver = new NullToEmptyObjectResolver()
+    };
 
-        public ChatQuotes(Core core) : base(core) { }
+    public ChatQuotes(Core core) : base(core) { }
 
-        public override void ConfigureServices(IServiceCollection services)
-        {
-            services.AddSingleton<QuoteGeneratorService>();
-        }
+    public override void ConfigureServices(IServiceCollection services)
+    {
+        services.AddSingleton<QuoteGeneratorService>();
     }
 }

modules/ChatQuotes/Json/NullToEmptyObjectResolver.cs

@@ -1,18 +1,17 @@
 using Newtonsoft.Json;
 using Newtonsoft.Json.Serialization;
 
-namespace West.TelegramBot.ChatQuotes.Json
+namespace West.TelegramBot.ChatQuotes.Json;
+
+class NullToEmptyObjectResolver : DefaultContractResolver
 {
-    class NullToEmptyObjectResolver : DefaultContractResolver
+    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
     {
-        protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
-        {
-            return type.GetProperties()
-                .Select(p => {
-                    var jp = base.CreateProperty(p, memberSerialization);
-                    jp.ValueProvider = new NullToEmptyObjectValueProvider(p);
-                    return jp;
-                }).ToList();
-        }
+        return type.GetProperties()
+            .Select(p => {
+                var jp = base.CreateProperty(p, memberSerialization);
+                jp.ValueProvider = new NullToEmptyObjectValueProvider(p);
+                return jp;
+            }).ToList();
     }
 }

modules/CodeWatcher/CodeWatcher.cs

@@ -4,20 +4,19 @@ using Microsoft.Extensions.DependencyInjection;
 using West.TelegramBot.CodeWatcher.Options;
 using West.TelegramBot.CodeWatcher.Service;
 
-namespace West.TelegramBot.CodeWatcher
+namespace West.TelegramBot.CodeWatcher;
+
+public class CodeWatcher : Module
 {
-    public class CodeWatcher : Module
+    public CodeWatcher(Core core) : base(core) {}
+
+    public override void ConfigureServices(IServiceCollection services)
     {
-        public CodeWatcher(Core core) : base(core) {}
+        services.AddOption<CodeWatcherMode>();
             
-        public override void ConfigureServices(IServiceCollection services)
+        services.AddHttpClient<IHasteService, HasteService>(c =>
         {
-            services.AddOption<CodeWatcherMode>();
-            
-            services.AddHttpClient<IHasteService, HasteService>(c =>
-            {
-                c.BaseAddress = new Uri(Core.Configuration["HastebinUrl"]!);
-            });
-        }
+            c.BaseAddress = new Uri(Core.Configuration["HastebinUrl"]!);
+        });
     }
 }

modules/CombotAntiSpam/UserJoinHandler.cs

@@ -6,7 +6,6 @@ using BotFramework.Enums;
 using Kruzya.TelegramBot.CombotAntiSpam.Combot;
 using Kruzya.TelegramBot.Core.Extensions;
 using Telegram.Bot;
-using Telegram.Bot.Types;
 using Telegram.Bot.Types.Enums;
 
 namespace Kruzya.TelegramBot.CombotAntiSpam;

modules/Destiny2.WhereIsXur/Provider/IXurPlaceProvider.cs

@@ -1,10 +1,9 @@
 using System.Threading.Tasks;
 
-namespace Kruzya.TelegramBot.Destiny2.WhereIsXur.Provider
+namespace Kruzya.TelegramBot.Destiny2.WhereIsXur.Provider;
+
+public interface IXurPlaceProvider
 {
-    public interface IXurPlaceProvider
-    {
-        public Task<string> GetPlaceAsync();
-        public string GetPlace();
-    }
+    public Task<string> GetPlaceAsync();
+    public string GetPlace();
 }

modules/Destiny2.WhereIsXur/Provider/XurWiki.cs

@@ -2,27 +2,26 @@ using System.Threading.Tasks;
 using Fizzler.Systems.HtmlAgilityPack;
 using HtmlAgilityPack;
 
-namespace Kruzya.TelegramBot.Destiny2.WhereIsXur.Provider
+namespace Kruzya.TelegramBot.Destiny2.WhereIsXur.Provider;
+
+public class XurWiki : IXurPlaceProvider
 {
-    public class XurWiki : IXurPlaceProvider
+    public async Task<string> GetPlaceAsync()
     {
-        public async Task<string> GetPlaceAsync()
+        var web = new HtmlWeb();
+        var document = await web.LoadFromWebAsync("https://xur.wiki");
+
+        var place = document.DocumentNode.QuerySelector(".location_name");
+        if (place != null)
         {
-            var web = new HtmlWeb();
-            var document = await web.LoadFromWebAsync("https://xur.wiki");
-
-            var place = document.DocumentNode.QuerySelector(".location_name");
-            if (place != null)
-            {
-                return place.InnerText.Trim();
-            }
-
-            return "";
+            return place.InnerText.Trim();
         }
 
-        public string GetPlace()
-        {
-            return GetPlaceAsync().GetAwaiter().GetResult();
-        }
+        return "";
+    }
+
+    public string GetPlace()
+    {
+        return GetPlaceAsync().GetAwaiter().GetResult();
     }
 }

modules/Destiny2.WhereIsXur/RequestHandler.cs

@@ -5,33 +5,32 @@ using Kruzya.TelegramBot.Destiny2.WhereIsXur.Provider;
 using Telegram.Bot;
 using Telegram.Bot.Types.Enums;
 
-namespace Kruzya.TelegramBot.Destiny2.WhereIsXur
+namespace Kruzya.TelegramBot.Destiny2.WhereIsXur;
+
+public class RequestHandler : BotEventHandler
 {
-    public class RequestHandler : BotEventHandler
+    protected readonly IXurPlaceProvider _placeProvider;
+
+    public RequestHandler(IXurPlaceProvider xurPlaceProvider)
     {
-        protected readonly IXurPlaceProvider _placeProvider;
+        _placeProvider = xurPlaceProvider;
+    }
         
-        public RequestHandler(IXurPlaceProvider xurPlaceProvider)
+    [Command("d2_xur")]
+    public async Task WhereIsXur()
+    {
+        var place = await _placeProvider.GetPlaceAsync();
+        if (string.IsNullOrWhiteSpace(place))
         {
-            _placeProvider = xurPlaceProvider;
+            await Response("unknown");
+            return;
         }
 
-        [Command("d2_xur")]
-        public async Task WhereIsXur()
-        {
-            var place = await _placeProvider.GetPlaceAsync();
-            if (string.IsNullOrWhiteSpace(place))
-            {
-                await Response("unknown");
-                return;
-            }
+        await Response(place);
+    }
 
-            await Response(place);
-        }
-
-        protected async Task Response(string place)
-        {
-            await Bot.SendTextMessageAsync(Chat, $"<b>Xûr</b> place is <code>{place}</code>", parseMode: ParseMode.Html);
-        }
+    protected async Task Response(string place)
+    {
+        await Bot.SendTextMessageAsync(Chat, $"<b>Xûr</b> place is <code>{place}</code>", parseMode: ParseMode.Html);
     }
 }

modules/Destiny2.WhereIsXur/WhereIsXur.cs

@@ -2,17 +2,16 @@
 using Kruzya.TelegramBot.Destiny2.WhereIsXur.Provider;
 using Microsoft.Extensions.DependencyInjection;
 
-namespace Kruzya.TelegramBot.Destiny2.WhereIsXur
-{
-    public class WhereIsXur : Module
-    {
-        public WhereIsXur(Core.Core core) : base(core)
-        {
-        }
+namespace Kruzya.TelegramBot.Destiny2.WhereIsXur;
 
-        public override void ConfigureServices(IServiceCollection services)
-        {
-            services.AddSingleton<IXurPlaceProvider, XurWiki>();
-        }
+public class WhereIsXur : Module
+{
+    public WhereIsXur(Core.Core core) : base(core)
+    {
+    }
+
+    public override void ConfigureServices(IServiceCollection services)
+    {
+        services.AddSingleton<IXurPlaceProvider, XurWiki>();
     }
 }

modules/Entertainment/Entertainment.cs

@@ -6,15 +6,14 @@ using Kruzya.TelegramBot.Core;
 using Microsoft.Extensions.DependencyInjection;
 
 
-namespace West.Entertainment
-{
-    public class Entertainment : Module
-    {
-        public Entertainment(Core core) : base(core) { }
+namespace West.Entertainment;
 
-        public override void ConfigureServices(IServiceCollection services)
-        {
-            services.AddSingleton<IGuessCache, GuessCache>();
-        }
+public class Entertainment : Module
+{
+    public Entertainment(Core core) : base(core) { }
+
+    public override void ConfigureServices(IServiceCollection services)
+    {
+        services.AddSingleton<IGuessCache, GuessCache>();
     }
 }

modules/Entertainment/Handler/Common.cs

@@ -13,52 +13,51 @@ using Microsoft.Extensions.Logging;
 using Telegram.Bot;
 using Telegram.Bot.Types.Enums;
 
-namespace West.Entertainment.Handler
+namespace West.Entertainment.Handler;
+
+public class Common : BotEventHandler
 {
-    public class Common : BotEventHandler
+    private readonly UserService _userService;
+    private readonly ILogger _logger;
+    private readonly CoreContext _db;
+        
+    public Common(CoreContext db, ILogger<Common> logger, UserService userService)
     {
-        private readonly UserService _userService;
-        private readonly ILogger _logger;
-        private readonly CoreContext _db;
+        _db = db;
+        _logger = logger;
+        _userService = userService;
+    }
 
-        public Common(CoreContext db, ILogger<Common> logger, UserService userService)
+    [InChat(InChat.Public)]
+    [Command("cooldowns", CommandParseMode.Both)]
+    public async Task HandleCooldowns()
+    {
+        if (!_userService.IsUserSuper(From))
         {
-            _db = db;
-            _logger = logger;
-            _userService = userService;
+            _logger.LogWarning("{User} attempted to use super-user command /cooldowns in {Chat}",
+                From.ToLog(),
+                Chat.ToLog()
+            );
+            return;
         }
             
-        [InChat(InChat.Public)]
-        [Command("cooldowns", CommandParseMode.Both)]
-        public async Task HandleCooldowns()
+        var cds = new[] { "python", "javascript" };
+
+        var msg = new HtmlString().Bold("Кулдауны:").Br();
+        foreach (var cd in cds)
         {
-            if (!_userService.IsUserSuper(From))
+            var opt = await _db.UserValues.FindOrCreateOption(Chat.Id, $"{cd}NextUse");
+            var val = opt.GetValue<DateTime>();
+            if (val == default)
             {
-                _logger.LogWarning("{User} attempted to use super-user command /cooldowns in {Chat}",
-                    From.ToLog(),
-                    Chat.ToLog()
-                );
-                return;
+                continue;
             }
 
-            var cds = new[] { "python", "javascript" };
-
-            var msg = new HtmlString().Bold("Кулдауны:").Br();
-            foreach (var cd in cds)
-            {
-                var opt = await _db.UserValues.FindOrCreateOption(Chat.Id, $"{cd}NextUse");
-                var val = opt.GetValue<DateTime>();
-                if (val == default)
-                {
-                    continue;
-                }
-
-                msg.Text($"{cd}: ")
-                    .Code(DateTime.Now > val ? "Ready" : (val - DateTime.Now).ToString())
-                    .Br();
-            }
-
-            await Bot.SendTextMessageAsync(Chat.Id, msg.ToString(), parseMode: ParseMode.Html);
+            msg.Text($"{cd}: ")
+                .Code(DateTime.Now > val ? "Ready" : (val - DateTime.Now).ToString())
+                .Br();
         }
+
+        await Bot.SendTextMessageAsync(Chat.Id, msg.ToString(), parseMode: ParseMode.Html);
     }
 }

modules/Entertainment/Handler/Fun/AbstractAnimationReply.cs

@@ -11,98 +11,97 @@ using Microsoft.Extensions.Logging;
 using Telegram.Bot;
 using Telegram.Bot.Types;
 
-namespace West.Entertainment.Handler.Fun
+namespace West.Entertainment.Handler.Fun;
+
+public abstract class AbstractAnimationReply : BotEventHandler
 {
-    public abstract class AbstractAnimationReply : BotEventHandler
+    private readonly CoreContext _db;
+
+    private readonly ILogger _logger;
+    private readonly ThreadSafeRandom _rng;
+
+    protected virtual TimeSpan Cooldown => TimeSpan.FromMinutes(_rng.Next(10, 1337));
+
+    protected Message? Message => RawUpdate.Message;
+
+    private User? RepliedUser => Message?.ReplyToMessage?.From;
+        
+    protected abstract Regex AnimationMatch
     {
-        private readonly CoreContext _db;
-
-        private readonly ILogger _logger;
-        private readonly ThreadSafeRandom _rng;
-
-        protected virtual TimeSpan Cooldown => TimeSpan.FromMinutes(_rng.Next(10, 1337));
-
-        protected Message? Message => RawUpdate.Message;
-
-        private User? RepliedUser => Message?.ReplyToMessage?.From;
-        
-        protected abstract Regex AnimationMatch
-        {
-            get;
-        }
-        
-        protected AbstractAnimationReply(CoreContext db, ILogger logger, ThreadSafeRandom rng)
-        {
-            _db = db;
-            _logger = logger;
-            _rng = rng;
-        }
-        
-        protected abstract string GetAnimationName();
-        
-        protected virtual bool CanHandle() => true;
-        
-        protected async Task HandleSetAnimation()
-        {
-            var animation = Message?.ReplyToMessage?.Animation;
-            var isAdmin = await Bot.IsUserAdminAsync(Chat, From);
-           
-            _logger.LogDebug("IsAdmin: {IsAdmin}. FileId: {FileId}", isAdmin, animation?.FileId);
-            if (!isAdmin || animation == null) return;
-
-            var animationFileOption = await GetAnimationFileOption();
-            animationFileOption.SetValue(animation.FileId);
-            _db.AddOrUpdate(animationFileOption);
-
-            await Bot.SendTextMessageAsync(Chat.Id, "Animation has been set.", replyToMessageId: Message!.ReplyToMessage!.MessageId);
-        }
-
-        protected virtual async Task<bool> HandleAnimation()
-        {
-            var text = Message!.Text!.ToLower();
-            if (!AnimationMatch.IsMatch(text.ToLower()) || text.StartsWith("/set") || !CanHandle()) return false;
-
-            var animationFileId = (await GetAnimationFileOption()).GetValue(string.Empty);
-            var nextUseOption = await GetNextUseOption();
-
-            _logger.LogDebug("Animation: {Text}, ToLower: {ToLowerText}", 
-                Message!.Text, Message!.Text!.ToLower());
-            _logger.LogDebug("AnimationFileId: {FileId}", animationFileId);
-
-            if (string.IsNullOrEmpty(animationFileId))
-            {
-                _logger.LogDebug("AnimationFileId is empty. Ignoring.");
-                return false;
-            }
-            
-            var nextUseDt = nextUseOption.GetValue<DateTime>();
-            if (nextUseDt > DateTime.Now)
-            {
-                _logger.LogInformation("{Name} is on cooldown for chat \"{ChatTitle}\". Will be available at {Time}",
-                    GetAnimationName(), Chat.Title, nextUseDt);
-
-                return false;
-            }
-            
-            await Bot.SendAnimationAsync(Chat.Id, new InputFileId(animationFileId), 
-                replyToMessageId: GetMessageIdToReply() ?? Message?.MessageId);
-
-            nextUseOption.SetValue(DateTime.Now + Cooldown);
-            _db.AddOrUpdate(nextUseOption);
-            
-            return true;
-        }
-        
-        private async Task<BotUserValue> GetAnimationFileOption()
-        {
-            return await _db.UserValues.FindOrCreateOption(Chat.Id, $"{GetAnimationName()}File");
-        }
-
-        private async Task<BotUserValue> GetNextUseOption()
-        {
-            return await _db.UserValues.FindOrCreateOption(Chat.Id, $"{GetAnimationName()}NextUse");
-        }
-        
-        protected virtual int? GetMessageIdToReply() => Message?.MessageId;
+        get;
     }
+        
+    protected AbstractAnimationReply(CoreContext db, ILogger logger, ThreadSafeRandom rng)
+    {
+        _db = db;
+        _logger = logger;
+        _rng = rng;
+    }
+        
+    protected abstract string GetAnimationName();
+        
+    protected virtual bool CanHandle() => true;
+        
+    protected async Task HandleSetAnimation()
+    {
+        var animation = Message?.ReplyToMessage?.Animation;
+        var isAdmin = await Bot.IsUserAdminAsync(Chat, From);
+           
+        _logger.LogDebug("IsAdmin: {IsAdmin}. FileId: {FileId}", isAdmin, animation?.FileId);
+        if (!isAdmin || animation == null) return;
+
+        var animationFileOption = await GetAnimationFileOption();
+        animationFileOption.SetValue(animation.FileId);
+        _db.AddOrUpdate(animationFileOption);
+
+        await Bot.SendTextMessageAsync(Chat.Id, "Animation has been set.", replyToMessageId: Message!.ReplyToMessage!.MessageId);
+    }
+
+    protected virtual async Task<bool> HandleAnimation()
+    {
+        var text = Message!.Text!.ToLower();
+        if (!AnimationMatch.IsMatch(text.ToLower()) || text.StartsWith("/set") || !CanHandle()) return false;
+
+        var animationFileId = (await GetAnimationFileOption()).GetValue(string.Empty);
+        var nextUseOption = await GetNextUseOption();
+
+        _logger.LogDebug("Animation: {Text}, ToLower: {ToLowerText}", 
+            Message!.Text, Message!.Text!.ToLower());
+        _logger.LogDebug("AnimationFileId: {FileId}", animationFileId);
+
+        if (string.IsNullOrEmpty(animationFileId))
+        {
+            _logger.LogDebug("AnimationFileId is empty. Ignoring.");
+            return false;
+        }
+            
+        var nextUseDt = nextUseOption.GetValue<DateTime>();
+        if (nextUseDt > DateTime.Now)
+        {
+            _logger.LogInformation("{Name} is on cooldown for chat \"{ChatTitle}\". Will be available at {Time}",
+                GetAnimationName(), Chat.Title, nextUseDt);
+
+            return false;
+        }
+            
+        await Bot.SendAnimationAsync(Chat.Id, new InputFileId(animationFileId), 
+            replyToMessageId: GetMessageIdToReply() ?? Message?.MessageId);
+
+        nextUseOption.SetValue(DateTime.Now + Cooldown);
+        _db.AddOrUpdate(nextUseOption);
+            
+        return true;
+    }
+        
+    private async Task<BotUserValue> GetAnimationFileOption()
+    {
+        return await _db.UserValues.FindOrCreateOption(Chat.Id, $"{GetAnimationName()}File");
+    }
+
+    private async Task<BotUserValue> GetNextUseOption()
+    {
+        return await _db.UserValues.FindOrCreateOption(Chat.Id, $"{GetAnimationName()}NextUse");
+    }
+        
+    protected virtual int? GetMessageIdToReply() => Message?.MessageId;
 }

modules/Entertainment/Handler/Fun/Bayan.cs

@@ -10,42 +10,41 @@ using Kruzya.TelegramBot.Core.Data;
 using Microsoft.Extensions.Logging;
 using Telegram.Bot;
 
-namespace West.Entertainment.Handler.Fun
+namespace West.Entertainment.Handler.Fun;
+
+public class Bayan : AbstractAnimationReply
 {
-    public class Bayan : AbstractAnimationReply
+    protected override TimeSpan Cooldown => TimeSpan.Zero;
+
+    public Bayan(CoreContext db, ILogger<Bayan> logger, ThreadSafeRandom rng) : base(db, logger, rng) { }
+
+    protected override Regex AnimationMatch 
+        => new("^баян$", RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
+
+    protected override string GetAnimationName() 
+        => "bayan";
+
+    [InChat(InChat.Public)]
+    [Command("setbayan", CommandParseMode.Both)]
+    public async Task HandleSetBayan() 
+        => await HandleSetAnimation();
+
+    [InChat(InChat.Public)]
+    [Message(MessageFlag.HasText)]
+    public async Task HandleBayan()
     {
-        protected override TimeSpan Cooldown => TimeSpan.Zero;
-
-        public Bayan(CoreContext db, ILogger<Bayan> logger, ThreadSafeRandom rng) : base(db, logger, rng) { }
-
-        protected override Regex AnimationMatch 
-            => new("^баян$", RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
-
-        protected override string GetAnimationName() 
-            => "bayan";
-
-        [InChat(InChat.Public)]
-        [Command("setbayan", CommandParseMode.Both)]
-        public async Task HandleSetBayan() 
-            => await HandleSetAnimation();
-
-        [InChat(InChat.Public)]
-        [Message(MessageFlag.HasText)]
-        public async Task HandleBayan()
+        if (await HandleAnimation())
         {
-            if (await HandleAnimation())
-            {
-                await Bot.DeleteMessageAsync(Chat.Id, Message!.MessageId);
-            }
+            await Bot.DeleteMessageAsync(Chat.Id, Message!.MessageId);
         }
-
-        protected override int? GetMessageIdToReply()
-        {
-            return Message!.ReplyToMessage!.MessageId;
-        }
-
-        protected override bool CanHandle() 
-            => Message?.ReplyToMessage != null;
-
     }
+
+    protected override int? GetMessageIdToReply()
+    {
+        return Message!.ReplyToMessage!.MessageId;
+    }
+
+    protected override bool CanHandle() 
+        => Message?.ReplyToMessage != null;
+
 }

modules/Entertainment/Handler/Fun/JavaScript.cs

@@ -6,28 +6,27 @@ using Kruzya.TelegramBot.Core;
 using Kruzya.TelegramBot.Core.Data;
 using Microsoft.Extensions.Logging;
 
-namespace West.Entertainment.Handler.Fun
-{
-    public class JavaScript : AbstractAnimationReply
-    {
-        public JavaScript(CoreContext db, ILogger<JavaScript> logger, ThreadSafeRandom rng) : base(db, logger, rng) { }
+namespace West.Entertainment.Handler.Fun;
 
-        protected override Regex AnimationMatch => new(
-            @"((?<![\w])(жс|js|v8)(?![\w]))|жаваскрипт|javascript|жопаскрипт|жиес|жиэс|nodejs", 
+public class JavaScript : AbstractAnimationReply
+{
+    public JavaScript(CoreContext db, ILogger<JavaScript> logger, ThreadSafeRandom rng) : base(db, logger, rng) { }
+
+    protected override Regex AnimationMatch => new(
+        @"((?<![\w])(жс|js|v8)(?![\w]))|жаваскрипт|javascript|жопаскрипт|жиес|жиэс|nodejs", 
         RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
         
-        protected override string GetAnimationName() => "javascript";
+    protected override string GetAnimationName() => "javascript";
 
-        [InChat(InChat.Public)]
-        [Command("setjs", CommandParseMode.Both)]
-        public async Task HandleSetJs() 
-            => await HandleSetAnimation();
+    [InChat(InChat.Public)]
+    [Command("setjs", CommandParseMode.Both)]
+    public async Task HandleSetJs() 
+        => await HandleSetAnimation();
 
-        [InChat(InChat.Public)]
-        [Message(MessageFlag.HasText)]
-        public async Task HandleJs()
-        {
-            await HandleAnimation();
-        }
+    [InChat(InChat.Public)]
+    [Message(MessageFlag.HasText)]
+    public async Task HandleJs()
+    {
+        await HandleAnimation();
     }
 }

modules/Entertainment/Handler/Fun/Python.cs

@@ -8,29 +8,28 @@ using Kruzya.TelegramBot.Core;
 using Kruzya.TelegramBot.Core.Data;
 using Microsoft.Extensions.Logging;
 
-namespace West.Entertainment.Handler.Fun
+namespace West.Entertainment.Handler.Fun;
+
+public class Python : AbstractAnimationReply
 {
-    public class Python : AbstractAnimationReply
+    protected override Regex AnimationMatch => 
+        new("питон|пайтон|python|путхон|питухон|петухон", 
+            RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
+
+    protected override string GetAnimationName() 
+        => "python";
+
+    [InChat(InChat.Public)]
+    [Command("setpython", CommandParseMode.Both)]
+    public async Task HandleSetPython() 
+        => await HandleSetAnimation();
+
+    [InChat(InChat.Public)]
+    [Message(MessageFlag.HasText)]
+    public async Task HandlePython()
     {
-        protected override Regex AnimationMatch => 
-            new("питон|пайтон|python|путхон|питухон|петухон", 
-                RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
-
-        protected override string GetAnimationName() 
-            => "python";
-
-        [InChat(InChat.Public)]
-        [Command("setpython", CommandParseMode.Both)]
-        public async Task HandleSetPython() 
-            => await HandleSetAnimation();
-
-        [InChat(InChat.Public)]
-        [Message(MessageFlag.HasText)]
-        public async Task HandlePython()
-        {
-            await HandleAnimation();
-        }
-
-        public Python(CoreContext db, ILogger<Python> logger, ThreadSafeRandom rng) : base(db, logger, rng) { }
+        await HandleAnimation();
     }
+
+    public Python(CoreContext db, ILogger<Python> logger, ThreadSafeRandom rng) : base(db, logger, rng) { }
 }

modules/RichSiteSummary/Data/Feed.cs

@@ -8,83 +8,82 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Data
+namespace Kruzya.TelegramBot.RichSiteSummary.Data;
+
+/// <summary>
+/// Represents a feed in database.
+/// </summary>
+public class Feed : RepresentableEntity
 {
-    /// <summary>
-    /// Represents a feed in database.
-    /// </summary>
-    public class Feed : RepresentableEntity
+    #region RepresentableEntity
+    protected override string ViewableText
     {
-        #region RepresentableEntity
-        protected override string ViewableText
-        {
-            get => Title;
-        }
-
-        protected override string ViewableUrl
-        {
-            get => HomePage;
-        }
-        #endregion
-
-        /// <summary>
-        /// The unique feed id.
-        /// </summary>
-        [Key]
-        public Guid FeedId { get; set; }
-        
-        /// <summary>
-        /// The feed URL.
-        /// </summary>
-        [Required]
-        public string Url { get; set; }
-        
-        /// <summary>
-        /// The home page for this feed.
-        /// </summary>
-        [Required]
-        public string HomePage { get; set; }
-        
-        /// <summary>
-        /// Feed title.
-        /// </summary>
-        [MaxLength(256)]
-        [Required]
-        public string Title { get; set; }
-        
-        /// <summary>
-        /// DateTime when feed fetched successfully in last time.
-        /// </summary>
-        [Required]
-        public DateTime UpdatedAt { get; set; }
-        
-        /// <summary>
-        /// This flag indicates, bot should monitor changes in post date, or not.
-        /// </summary>
-        [Required]
-        [DefaultValue(false)]
-        public bool WatchPostDate { get; set; }
-
-        [Required]
-        [DefaultValue(false)]
-        public bool IsPrivate { get; set; }
-
-        public Feed()
-        {
-            FeedId = new Guid();
-            UpdatedAt = DateTime.Now;
-        }
-
-        /// <summary>
-        /// All posts from this feed.
-        /// </summary>
-        public virtual ICollection<Post> Posts { get; set; }
-        
-        /// <summary>
-        /// All exists subscriber for this feed.
-        /// </summary>
-        public virtual ICollection<Subscriber> Subscribers { get; set; }
-
-        public override string ToString() => Title;
+        get => Title;
     }
+
+    protected override string ViewableUrl
+    {
+        get => HomePage;
+    }
+    #endregion
+
+    /// <summary>
+    /// The unique feed id.
+    /// </summary>
+    [Key]
+    public Guid FeedId { get; set; }
+        
+    /// <summary>
+    /// The feed URL.
+    /// </summary>
+    [Required]
+    public string Url { get; set; }
+        
+    /// <summary>
+    /// The home page for this feed.
+    /// </summary>
+    [Required]
+    public string HomePage { get; set; }
+        
+    /// <summary>
+    /// Feed title.
+    /// </summary>
+    [MaxLength(256)]
+    [Required]
+    public string Title { get; set; }
+        
+    /// <summary>
+    /// DateTime when feed fetched successfully in last time.
+    /// </summary>
+    [Required]
+    public DateTime UpdatedAt { get; set; }
+        
+    /// <summary>
+    /// This flag indicates, bot should monitor changes in post date, or not.
+    /// </summary>
+    [Required]
+    [DefaultValue(false)]
+    public bool WatchPostDate { get; set; }
+
+    [Required]
+    [DefaultValue(false)]
+    public bool IsPrivate { get; set; }
+
+    public Feed()
+    {
+        FeedId = new Guid();
+        UpdatedAt = DateTime.Now;
+    }
+
+    /// <summary>
+    /// All posts from this feed.
+    /// </summary>
+    public virtual ICollection<Post> Posts { get; set; }
+        
+    /// <summary>
+    /// All exists subscriber for this feed.
+    /// </summary>
+    public virtual ICollection<Subscriber> Subscribers { get; set; }
+
+    public override string ToString() => Title;
 }

modules/RichSiteSummary/Data/Post.cs

@@ -9,99 +9,98 @@ using System.Text;
 using Kruzya.TelegramBot.RichSiteSummary.UrchinTrackingModule;
 using Telegram.Bot.Types.Enums;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Data
+namespace Kruzya.TelegramBot.RichSiteSummary.Data;
+
+/// <summary>
+/// Represents a post from feed in database.
+/// </summary>
+public class Post : RepresentableEntity
 {
-    /// <summary>
-    /// Represents a post from feed in database.
-    /// </summary>
-    public class Post : RepresentableEntity
+    #region RepresentableEntity
+    protected override ParseMode DefaultRepresentation
     {
-        #region RepresentableEntity
-        protected override ParseMode DefaultRepresentation
+        get => ParseMode.Html;
+    }
+
+    protected override string ViewableText
+    {
+        get => Title;
+    }
+
+    protected override string ViewableUrl
+    {
+        get => UtmUtility.ApplyParameters(new Uri(new(Feed.Url), Url), new UtmParameters()
         {
-            get => ParseMode.Html;
-        }
+            Source = "telegram",
+            Type = "rss_post",
+            Campaign = "subscriber",
+            Content = PostId.ToString()
+        });
+    }
 
-        protected override string ViewableText
+    #endregion
+
+    /// <summary>
+    /// The unique post id.
+    /// </summary>
+    [Key]
+    public Guid PostId { get; set; }
+
+    /// <summary>
+    /// The feed unique identifier from where this post is fetched.
+    /// </summary>
+    public Guid FeedId { get; set; }
+        
+    /// <summary>
+    /// The feed from where this post is fetched.
+    /// </summary>
+    [Required]
+    public virtual Feed Feed { get; set; } 
+        
+    /// <summary>
+    /// The post title.
+    /// </summary>
+    [MaxLength(256)]
+    [Required]
+    public string Title { get; set; }
+        
+    /// <summary>
+    /// The URI where this post is located in web.
+    /// </summary>
+    [Required]
+    [MaxLength(256)]
+    public string Url { get; set; }
+        
+    /// <summary>
+    /// DateTime when post is created in RSS feed.
+    /// </summary>
+    [Required]
+    public DateTime PostedAt { get; set; }
+        
+    /// <summary>
+    /// DateTime when post is fetched/updated in database.
+    /// </summary>
+    [Required]
+    public DateTime ReceivedAt { get; set; }
+
+    public Post()
+    {
+        PostId = new Guid();
+        ReceivedAt = DateTime.Now;
+    }
+
+    public string MessageText
+    {
+        get
         {
-            get => Title;
-        }
+            var message = new StringBuilder();
+            message.Append($"{Representation("🗞")} New on {Feed.Representation(ParseMode.Html)}\n");
+            message.Append("\n");
+            message.Append(Title);
+            message.Append("\n");
+            message.Append(Representation("Open in browser"));
             
-        protected override string ViewableUrl
-        {
-            get => UtmUtility.ApplyParameters(new Uri(new(Feed.Url), Url), new UtmParameters()
-            {
-                Source = "telegram",
-                Type = "rss_post",
-                Campaign = "subscriber",
-                Content = PostId.ToString()
-            });
-        }
-
-        #endregion
-
-        /// <summary>
-        /// The unique post id.
-        /// </summary>
-        [Key]
-        public Guid PostId { get; set; }
-
-        /// <summary>
-        /// The feed unique identifier from where this post is fetched.
-        /// </summary>
-        public Guid FeedId { get; set; }
-        
-        /// <summary>
-        /// The feed from where this post is fetched.
-        /// </summary>
-        [Required]
-        public virtual Feed Feed { get; set; } 
-        
-        /// <summary>
-        /// The post title.
-        /// </summary>
-        [MaxLength(256)]
-        [Required]
-        public string Title { get; set; }
-        
-        /// <summary>
-        /// The URI where this post is located in web.
-        /// </summary>
-        [Required]
-        [MaxLength(256)]
-        public string Url { get; set; }
-        
-        /// <summary>
-        /// DateTime when post is created in RSS feed.
-        /// </summary>
-        [Required]
-        public DateTime PostedAt { get; set; }
-        
-        /// <summary>
-        /// DateTime when post is fetched/updated in database.
-        /// </summary>
-        [Required]
-        public DateTime ReceivedAt { get; set; }
-
-        public Post()
-        {
-            PostId = new Guid();
-            ReceivedAt = DateTime.Now;
-        }
-
-        public string MessageText
-        {
-            get
-            {
-                var message = new StringBuilder();
-                message.Append($"{Representation("🗞")} New on {Feed.Representation(ParseMode.Html)}\n");
-                message.Append("\n");
-                message.Append(Title);
-                message.Append("\n");
-                message.Append(Representation("Open in browser"));
-            
-                return message.ToString();
-            }
+            return message.ToString();
         }
     }
 }

modules/RichSiteSummary/Data/RepresentableEntity.cs

@@ -7,55 +7,54 @@ using System;
 using System.Web;
 using Telegram.Bot.Types.Enums;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Data
+namespace Kruzya.TelegramBot.RichSiteSummary.Data;
+
+/// <summary>
+/// Implements the basic logic for rendering Database Entities in messages.
+/// </summary>
+public abstract class RepresentableEntity
 {
-    /// <summary>
-    /// Implements the basic logic for rendering Database Entities in messages.
-    /// </summary>
-    public abstract class RepresentableEntity
+    protected virtual string ViewableText { get; }
+    protected virtual string ViewableUrl { get; }
+    protected virtual ParseMode DefaultRepresentation { get; }
+
+    public override string ToString() => Representation();
+
+    public string Representation(string text) => Representation(DefaultRepresentation, text);
+        
+    public string Representation() => Representation(DefaultRepresentation);
+        
+    public string Representation(ParseMode parseMode) => Representation(parseMode, ViewableText);
+        
+    public string Representation(ParseMode parseMode, string text)
     {
-        protected virtual string ViewableText { get; }
-        protected virtual string ViewableUrl { get; }
-        protected virtual ParseMode DefaultRepresentation { get; }
-
-        public override string ToString() => Representation();
-
-        public string Representation(string text) => Representation(DefaultRepresentation, text);
-        
-        public string Representation() => Representation(DefaultRepresentation);
-        
-        public string Representation(ParseMode parseMode) => Representation(parseMode, ViewableText);
-        
-        public string Representation(ParseMode parseMode, string text)
+        string content = String.Empty;
+        switch (parseMode)
         {
-            string content = String.Empty;
-            switch (parseMode)
-            {
-                case ParseMode.Html:
-                    content = HtmlRepresentation(text);
-                    break;
+            case ParseMode.Html:
+                content = HtmlRepresentation(text);
+                break;
                 
-                case ParseMode.Markdown:
-                case ParseMode.MarkdownV2:
-                    throw new NotImplementedException();
-            }
-
-            return content;
+            case ParseMode.Markdown:
+            case ParseMode.MarkdownV2:
+                throw new NotImplementedException();
         }
 
-        #region Representations
-
-        public string RawRepresentation(string text)
-            => text;
-
-        public string HtmlRepresentation(string text)
-        {
-            var escapedText = HttpUtility.HtmlEncode(text);
-            var escapedUrl = HttpUtility.HtmlAttributeEncode(ViewableUrl);
-
-            return $"<a href=\"{escapedUrl}\">{escapedText}</a>";
-        }
-        
-        #endregion
+        return content;
     }
+
+    #region Representations
+
+    public string RawRepresentation(string text)
+        => text;
+
+    public string HtmlRepresentation(string text)
+    {
+        var escapedText = HttpUtility.HtmlEncode(text);
+        var escapedUrl = HttpUtility.HtmlAttributeEncode(ViewableUrl);
+
+        return $"<a href=\"{escapedUrl}\">{escapedText}</a>";
+    }
+        
+    #endregion
 }

modules/RichSiteSummary/Data/RichSiteSummaryContext.cs

@@ -1,58 +1,57 @@
 using Kruzya.TelegramBot.Core.EF;
 using Microsoft.EntityFrameworkCore;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Data
+namespace Kruzya.TelegramBot.RichSiteSummary.Data;
+
+public class RichSiteSummaryContext : AutoSaveDbContext
 {
-    public class RichSiteSummaryContext : AutoSaveDbContext
+    /// <summary>
+    /// Repository with all feeds in database.
+    /// </summary>
+    public DbSet<Feed> Feeds { get; set; }
+        
+    /// <summary>
+    /// Repository with all posts in database.
+    /// </summary>
+    public DbSet<Post> Posts { get; set; }
+        
+    /// <summary>
+    /// Repository with all subscriptions in database.
+    /// </summary>
+    public DbSet<Subscriber> Subscriptions { get; set; }
+
+    /// <summary>
+    /// Ensures the database is created and calls parent constructor.
+    /// </summary>
+    /// <param name="options"></param>
+    public RichSiteSummaryContext(DbContextOptions<RichSiteSummaryContext> options) : base(options)
     {
-        /// <summary>
-        /// Repository with all feeds in database.
-        /// </summary>
-        public DbSet<Feed> Feeds { get; set; }
+        Database.EnsureCreated();
+    }
 
-        /// <summary>
-        /// Repository with all posts in database.
-        /// </summary>
-        public DbSet<Post> Posts { get; set; }
+    /// <summary>
+    /// Setup the additional unique keys.
+    /// </summary>
+    /// <param name="modelBuilder"></param>
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        // Setup unique keys for Feed entity.
+        modelBuilder.Entity<Feed>().HasIndex(feed => feed.Url).IsUnique();
+        modelBuilder.Entity<Feed>().HasIndex(feed => feed.HomePage).IsUnique();
             
-        /// <summary>
-        /// Repository with all subscriptions in database.
-        /// </summary>
-        public DbSet<Subscriber> Subscriptions { get; set; }
+        // Setup unique keys for Post entity.
+        modelBuilder.Entity<Post>()
+            .HasOne(p => p.Feed)
+            .WithMany(f => f.Posts)
+            .HasForeignKey(p => p.FeedId);
 
-        /// <summary>
-        /// Ensures the database is created and calls parent constructor.
-        /// </summary>
-        /// <param name="options"></param>
-        public RichSiteSummaryContext(DbContextOptions<RichSiteSummaryContext> options) : base(options)
-        {
-            Database.EnsureCreated();
-        }
+        modelBuilder.Entity<Post>().HasIndex(post => 
+            new {post.FeedId, post.Url}).IsUnique();
 
-        /// <summary>
-        /// Setup the additional unique keys.
-        /// </summary>
-        /// <param name="modelBuilder"></param>
-        protected override void OnModelCreating(ModelBuilder modelBuilder)
-        {
-            // Setup unique keys for Feed entity.
-            modelBuilder.Entity<Feed>().HasIndex(feed => feed.Url).IsUnique();
-            modelBuilder.Entity<Feed>().HasIndex(feed => feed.HomePage).IsUnique();
-            
-            // Setup unique keys for Post entity.
-            modelBuilder.Entity<Post>()
-                .HasOne(p => p.Feed)
-                .WithMany(f => f.Posts)
-                .HasForeignKey(p => p.FeedId);
-
-            modelBuilder.Entity<Post>().HasIndex(post => 
-                new {post.FeedId, post.Url}).IsUnique();
-
-            // Setup foreign keys for Subscriber entity.
-            modelBuilder.Entity<Subscriber>()
-                .HasOne(s => s.Feed)
-                .WithMany(f => f.Subscribers)
-                .HasForeignKey(s => s.FeedId);
-        }
+        // Setup foreign keys for Subscriber entity.
+        modelBuilder.Entity<Subscriber>()
+            .HasOne(s => s.Feed)
+            .WithMany(f => f.Subscribers)
+            .HasForeignKey(s => s.FeedId);
     }
 }

modules/RichSiteSummary/Data/Subscriber.cs

@@ -6,51 +6,50 @@
 using System;
 using System.ComponentModel.DataAnnotations;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Data
+namespace Kruzya.TelegramBot.RichSiteSummary.Data;
+
+/// <summary>
+/// Represents a subscription in database.
+/// </summary>
+public class Subscriber
 {
     /// <summary>
-    /// Represents a subscription in database.
+    /// The unique Subscription identifier.
     /// </summary>
-    public class Subscriber
+    [Key]
+    public Guid SubscriptionId { get; set; }
+        
+    /// <summary>
+    /// The Telegram subscriber id.
+    /// </summary>
+    [Required]
+    public Int64 SubscriberId { get; set; }
+        
+    /// <summary>
+    /// Unique feed identifier related with this Subscription. Identifies what user is read.
+    /// </summary>
+    public Guid FeedId { get; set; }
+        
+    /// <summary>
+    /// Feed related with this Subscription. Identifies what user is read.
+    /// </summary>
+    [Required]
+    public virtual Feed Feed { get; set; }
+
+    /// <summary>
+    /// When user is subscribed on this feed.
+    /// </summary>
+    [Required]
+    public DateTime SubscribedAt { get; set; }
+
+    public Subscriber()
     {
-        /// <summary>
-        /// The unique Subscription identifier.
-        /// </summary>
-        [Key]
-        public Guid SubscriptionId { get; set; }
+        SubscriptionId = new Guid();
+        SubscribedAt = DateTime.Now;
+    }
 
-        /// <summary>
-        /// The Telegram subscriber id.
-        /// </summary>
-        [Required]
-        public Int64 SubscriberId { get; set; }
-        
-        /// <summary>
-        /// Unique feed identifier related with this Subscription. Identifies what user is read.
-        /// </summary>
-        public Guid FeedId { get; set; }
-        
-        /// <summary>
-        /// Feed related with this Subscription. Identifies what user is read.
-        /// </summary>
-        [Required]
-        public virtual Feed Feed { get; set; }
-
-        /// <summary>
-        /// When user is subscribed on this feed.
-        /// </summary>
-        [Required]
-        public DateTime SubscribedAt { get; set; }
-
-        public Subscriber()
-        {
-            SubscriptionId = new Guid();
-            SubscribedAt = DateTime.Now;
-        }
-
-        public Subscriber(Feed feed) : base()
-        {
-            Feed = feed;
-        }
+    public Subscriber(Feed feed) : base()
+    {
+        Feed = feed;
     }
 }

modules/RichSiteSummary/Handler/AbstractHandler.cs

@@ -1,15 +1,14 @@
 using BotFramework;
 using Kruzya.TelegramBot.RichSiteSummary.Data;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Handler
-{
-    public abstract class AbstractHandler : BotEventHandler
-    {
-        protected readonly RichSiteSummaryContext _dbContext;
+namespace Kruzya.TelegramBot.RichSiteSummary.Handler;
 
-        protected AbstractHandler(RichSiteSummaryContext dbContext)
-        {
-            _dbContext = dbContext;
-        }
+public abstract class AbstractHandler : BotEventHandler
+{
+    protected readonly RichSiteSummaryContext _dbContext;
+
+    protected AbstractHandler(RichSiteSummaryContext dbContext)
+    {
+        _dbContext = dbContext;
     }
 }

modules/RichSiteSummary/Handler/FeedList.cs

@@ -13,299 +13,298 @@ using Telegram.Bot.Types;
 using Telegram.Bot.Types.Enums;
 using Telegram.Bot.Types.ReplyMarkups;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Handler
+namespace Kruzya.TelegramBot.RichSiteSummary.Handler;
+
+public class FeedList : AbstractHandler
 {
-    public class FeedList : AbstractHandler
+    public FeedList(RichSiteSummaryContext dbContext) : base(dbContext)
     {
-        public FeedList(RichSiteSummaryContext dbContext) : base(dbContext)
+    }
+        
+    [ParametrizedCommand("rss_show")]
+    public async Task ShowFeed(Feed feed) => await ShowFeed(feed, Chat, From);
+
+    public async Task ShowFeed(Guid feedId, Chat chat, User from)
+    {
+        var feed = await _dbContext.FindAsync<Feed>(feedId);
+        if (feed == null)
         {
+            return;
         }
 
-        [ParametrizedCommand("rss_show")]
-        public async Task ShowFeed(Feed feed) => await ShowFeed(feed, Chat, From);
+        await ShowFeed(feed, chat, from);
+    }
 
-        public async Task ShowFeed(Guid feedId, Chat chat, User from)
+    public async Task ShowFeed(Feed feed, Chat chat, User from, Message message = null)
+    {
+        var textBuilder = new StringBuilder();
+        textBuilder.Append(feed.Representation(ParseMode.Html));
+        textBuilder.Append("\n");
+        textBuilder.Append($"<b>Posts at this moment</b>: {feed.Posts.Count}\n");
+        textBuilder.Append($"<b>RSS feed</b>: <code>{feed.Url}</code>\n");
+        textBuilder.Append($"<b>Home page</b>: <code>{feed.HomePage}</code>\n");
+        textBuilder.Append($"<b>Last synchronization</b>: <code>{feed.UpdatedAt}</code>");
+
+        var text = textBuilder.ToString();
+
+        var buttons = new List<InlineKeyboardButton>();
+        var callbackData = $"feed|{from.Id}|do|{feed.FeedId}";
+        if (await _dbContext.Subscriptions.HasSubscription(chat, feed))
         {
-            var feed = await _dbContext.FindAsync<Feed>(feedId);
-            if (feed == null)
+            buttons.Add(new InlineKeyboardButton("Unsubscribe")
             {
-                return;
-            }
-
-            await ShowFeed(feed, chat, from);
-        }
-
-        public async Task ShowFeed(Feed feed, Chat chat, User from, Message message = null)
-        {
-            var textBuilder = new StringBuilder();
-            textBuilder.Append(feed.Representation(ParseMode.Html));
-            textBuilder.Append("\n");
-            textBuilder.Append($"<b>Posts at this moment</b>: {feed.Posts.Count}\n");
-            textBuilder.Append($"<b>RSS feed</b>: <code>{feed.Url}</code>\n");
-            textBuilder.Append($"<b>Home page</b>: <code>{feed.HomePage}</code>\n");
-            textBuilder.Append($"<b>Last synchronization</b>: <code>{feed.UpdatedAt}</code>");
-
-            var text = textBuilder.ToString();
-
-            var buttons = new List<InlineKeyboardButton>();
-            var callbackData = $"feed|{from.Id}|do|{feed.FeedId}";
-            if (await _dbContext.Subscriptions.HasSubscription(chat, feed))
-            {
-                buttons.Add(new InlineKeyboardButton("Unsubscribe")
-                {
-                    CallbackData = callbackData,
-                });
-            }
-            else
-            {
-                buttons.Add(new InlineKeyboardButton("Subscribe")
-                {
-                    CallbackData = callbackData,
-                });
-            }
-            buttons.Add(new InlineKeyboardButton("Last 10 posts")
-            {
-                CallbackData = $"feed|{from.Id}|last|{feed.FeedId}",
+                CallbackData = callbackData,
             });
+        }
+        else
+        {
+            buttons.Add(new InlineKeyboardButton("Subscribe")
+            {
+                CallbackData = callbackData,
+            });
+        }
+        buttons.Add(new InlineKeyboardButton("Last 10 posts")
+        {
+            CallbackData = $"feed|{from.Id}|last|{feed.FeedId}",
+        });
 
-            var inlineButtons = new InlineKeyboardMarkup(buttons);
-            if (message == null)
+        var inlineButtons = new InlineKeyboardMarkup(buttons);
+        if (message == null)
+        {
+            await Bot.SendTextMessageAsync(new ChatId(chat.Id), text, 0, ParseMode.Html, null, true, true, false, 0, replyMarkup: inlineButtons);
+        }
+        else
+        {
+            await Bot.EditMessageTextAsync(chat, message.MessageId, text, ParseMode.Html, null, true, replyMarkup: inlineButtons);
+        }
+    }
+        
+    [ParametrizedCommand("rss_list")]
+    public async Task List() => await GenerateMenu();
+
+    [ParametrizedCommand("rss_search")]
+    public async Task Search(string query)
+    {
+        if (!(await GenerateMenu(query)))
+        {
+            await Bot.SendTextMessageAsync(Chat, $"No one feed match by search pattern (<code>{query}</code>).", 0, ParseMode.Html, null, true);
+        }
+    }
+
+    [Command("rss_subscriptions")]
+    public async Task Subscriptions()
+    {
+        if (!(await GenerateMenu(":sub")))
+        {
+            await Bot.SendTextMessageAsync(Chat,
+                "There are no one subscription. Add new with /feed_list or /feed_search.");
+        }
+    }
+
+    #region Message generator
+        
+    protected async Task<bool> GenerateMenu() =>
+        await GenerateMenu(string.Empty);
+
+    protected async Task<bool> GenerateMenu(string query) =>
+        await GenerateMenu(query, 0);
+
+    protected async Task<bool> GenerateMenu(string query, UInt16 page, Message editableMessage = null)
+    {
+        var chat = editableMessage != null ? (editableMessage.Chat) : Chat;
+        var elementsOnPage = 9;
+        var startIndex = page * elementsOnPage;
+        var dbQuery = _dbContext.Feeds.AsQueryable()
+            .Where(f => !f.IsPrivate);
+
+        if (!string.IsNullOrWhiteSpace(query))
+        {
+            var searchQuery = query.ToLower();
+            if (query.EndsWith(":sub"))
             {
-                await Bot.SendTextMessageAsync(new ChatId(chat.Id), text, 0, ParseMode.Html, null, true, true, false, 0, replyMarkup: inlineButtons);
-            }
-            else
-            {
-                await Bot.EditMessageTextAsync(chat, message.MessageId, text, ParseMode.Html, null, true, replyMarkup: inlineButtons);
+                var chatList = await _dbContext.Subscriptions.AllSubscriptions(chat).Select(chat => chat.Feed.FeedId).ToArrayAsync();
+                dbQuery = dbQuery.Where(sub => chatList.Contains(sub.FeedId));
+
+                searchQuery = searchQuery.Remove(searchQuery.Length - 4, 4);
             }
+                
+            dbQuery = dbQuery.Where(feed => feed.Title.ToLower().Contains(searchQuery) || feed.Url.ToLower().Contains(searchQuery) || feed.HomePage.ToLower().Contains(searchQuery));
         }
 
-        [ParametrizedCommand("rss_list")]
-        public async Task List() => await GenerateMenu();
-
-        [ParametrizedCommand("rss_search")]
-        public async Task Search(string query)
+        var totalCount = await dbQuery.CountAsync();
+        if (totalCount == 0)
         {
-            if (!(await GenerateMenu(query)))
-            {
-                await Bot.SendTextMessageAsync(Chat, $"No one feed match by search pattern (<code>{query}</code>).", 0, ParseMode.Html, null, true);
-            }
+            return false;
         }
 
-        [Command("rss_subscriptions")]
-        public async Task Subscriptions()
+        if (totalCount == 1)
         {
-            if (!(await GenerateMenu(":sub")))
-            {
-                await Bot.SendTextMessageAsync(Chat,
-                    "There are no one subscription. Add new with /feed_list or /feed_search.");
-            }
-        }
-
-        #region Message generator
-        
-        protected async Task<bool> GenerateMenu() =>
-            await GenerateMenu(string.Empty);
-
-        protected async Task<bool> GenerateMenu(string query) =>
-            await GenerateMenu(query, 0);
-
-        protected async Task<bool> GenerateMenu(string query, UInt16 page, Message editableMessage = null)
-        {
-            var chat = editableMessage != null ? (editableMessage.Chat) : Chat;
-            var elementsOnPage = 9;
-            var startIndex = page * elementsOnPage;
-            var dbQuery = _dbContext.Feeds.AsQueryable()
-                .Where(f => !f.IsPrivate);
-
-            if (!string.IsNullOrWhiteSpace(query))
-            {
-                var searchQuery = query.ToLower();
-                if (query.EndsWith(":sub"))
-                {
-                    var chatList = await _dbContext.Subscriptions.AllSubscriptions(chat).Select(chat => chat.Feed.FeedId).ToArrayAsync();
-                    dbQuery = dbQuery.Where(sub => chatList.Contains(sub.FeedId));
-
-                    searchQuery = searchQuery.Remove(searchQuery.Length - 4, 4);
-                }
-                
-                dbQuery = dbQuery.Where(feed => feed.Title.ToLower().Contains(searchQuery) || feed.Url.ToLower().Contains(searchQuery) || feed.HomePage.ToLower().Contains(searchQuery));
-            }
-
-            var totalCount = await dbQuery.CountAsync();
-            if (totalCount == 0)
-            {
-                return false;
-            }
-
-            if (totalCount == 1)
-            {
-                await ShowFeed((await dbQuery.FirstOrDefaultAsync()), Chat, From);
-                return true;
-            }
-            
-            var result = await dbQuery.Take(elementsOnPage * (page + 1)).Skip(startIndex)
-                .ToArrayAsync();
-            
-            var backButton = (page > 0);
-            var nextButton = totalCount >= (startIndex + elementsOnPage);
-
-            var buttons = new List<List<InlineKeyboardButton>>();
-            List<InlineKeyboardButton> row;
-            foreach (var feed in result)
-            {
-                row = new List<InlineKeyboardButton>();
-                row.Add(new InlineKeyboardButton(feed.Title)
-                {
-                    CallbackData = $"feed|{From.Id}|show|{feed.FeedId.ToString()}",
-                });
-
-                buttons.Add(row);
-            }
-            
-            if (backButton || nextButton)
-            {
-                row = new List<InlineKeyboardButton>();
-                if (backButton)
-                {
-                    row.Add(new InlineKeyboardButton("⬅️")
-                    {
-                        CallbackData = $"feed|{From.Id}|page|{query}|{page - 1}",
-                    });
-                }
-                
-                row.Add(new InlineKeyboardButton($"{page + 1}/{(totalCount / elementsOnPage) + 1}")
-                {
-                    CallbackData = $"feed|{From.Id}|donothing",
-                });
-
-                if (nextButton)
-                {
-                    row.Add(new InlineKeyboardButton("➡️")
-                    {
-                        CallbackData = $"feed|{From.Id}|page|{query}|{page + 1}",
-                    });
-                }
-                
-                buttons.Add(row);
-            }
-            
-            if (editableMessage == null)
-            {
-                await Bot.SendTextMessageAsync(Chat, "Select the feed for viewing details", 0, null,
-                    null, true, true, false, 0, replyMarkup: new InlineKeyboardMarkup(buttons));
-            }
-            else
-            {
-                await Bot.EditMessageTextAsync(editableMessage.Chat, editableMessage.MessageId, "Select the feed for viewing details", null, null, false,
-                    new InlineKeyboardMarkup(buttons));
-            }
-
+            await ShowFeed((await dbQuery.FirstOrDefaultAsync()), Chat, From);
             return true;
         }
             
-        #endregion
+        var result = await dbQuery.Take(elementsOnPage * (page + 1)).Skip(startIndex)
+            .ToArrayAsync();
             
-        #region Message handler
+        var backButton = (page > 0);
+        var nextButton = totalCount >= (startIndex + elementsOnPage);
 
-        [Update(UpdateFlag.CallbackQuery)]
-        public async Task HandleAction()
+        var buttons = new List<List<InlineKeyboardButton>>();
+        List<InlineKeyboardButton> row;
+        foreach (var feed in result)
         {
-            if (!RawUpdate.CallbackQuery.Data.StartsWith("feed|"))
+            row = new List<InlineKeyboardButton>();
+            row.Add(new InlineKeyboardButton(feed.Title)
             {
-                return;
-            }
+                CallbackData = $"feed|{From.Id}|show|{feed.FeedId.ToString()}",
+            });
 
-            var data = RawUpdate.CallbackQuery.Data.Split('|');
-            var fromId = Int64.Parse(data[1]);
-            if (fromId != From.Id)
-            {
-                await Bot.AnswerCallbackQueryAsync(RawUpdate.CallbackQuery.Id,
-                    "You can't perform this action: command called by another user.", true);
-                return;
-            }
-
-            // Check action.
-            switch (data[2])
-            {
-                case "page":
-                    await GenerateMenu(data[3], UInt16.Parse(data[4]), RawUpdate.CallbackQuery.Message);
-                    break;
-                
-                case "show":
-                    await ShowFeed(Guid.Parse(data[3]), RawUpdate.CallbackQuery.Message.Chat, RawUpdate.CallbackQuery.From);
-                    break;
-                
-                case "do":
-                    if (RawUpdate.CallbackQuery.From.Id != RawUpdate.CallbackQuery.Message.Chat.Id)
-                    {
-                        var userStatus = (await Bot.GetChatMemberAsync(RawUpdate.CallbackQuery.Message.Chat, RawUpdate.CallbackQuery.From.Id)).Status;
-                        var allowedUserStatuses = new ChatMemberStatus[]
-                            {ChatMemberStatus.Administrator, ChatMemberStatus.Creator};
-
-                        if (!allowedUserStatuses.Contains(userStatus))
-                        {
-                            await Bot.AnswerCallbackQueryAsync(RawUpdate.CallbackQuery.Id,
-                                "You can't perform this action: you don't have administrator permissions.", true);
-                            return;
-                        }
-                    }
-
-                    await ChangeFeedSubscription(Guid.Parse(data[3]), RawUpdate.CallbackQuery.Message.Chat, RawUpdate.CallbackQuery.From, RawUpdate.CallbackQuery.Message);
-                    break;
-                
-                case "last":
-                    var feed = await _dbContext.FindAsync<Feed>(Guid.Parse(data[3]));
-                    var posts = feed.Posts.OrderByDescending(p => p.ReceivedAt).Take(10).ToList();
-                    
-                    var messageTextBuilder = new StringBuilder();
-                    messageTextBuilder.Append($"Last 10 posts from {feed.Representation(ParseMode.Html)}\n");
-                    messageTextBuilder.Append("\n");
-
-                    var idx = 1;
-                    foreach (var post in posts)
-                    {
-                        messageTextBuilder.Append($"{idx}. {post}\n");
-                        idx++;
-                    }
-
-                    await Bot.SendTextMessageAsync(RawUpdate.CallbackQuery.Message.Chat, messageTextBuilder.ToString(),
-                        0, ParseMode.Html, null, true);
-                    break;
-            }
-            
-            await Bot.AnswerCallbackQueryAsync(RawUpdate.CallbackQuery.Id);
+            buttons.Add(row);
         }
             
-        protected async Task ChangeFeedSubscription(Guid feedId, Chat chat, User from, Message message)
+        if (backButton || nextButton)
         {
-            var feed = await _dbContext.FindAsync<Feed>(feedId);
-            if (feed == null)
+            row = new List<InlineKeyboardButton>();
+            if (backButton)
             {
-                return;
+                row.Add(new InlineKeyboardButton("⬅️")
+                {
+                    CallbackData = $"feed|{From.Id}|page|{query}|{page - 1}",
+                });
             }
                 
-            var subscriptionState = await _dbContext.Subscriptions.HasSubscription(chat, feed);
-            if (subscriptionState)
+            row.Add(new InlineKeyboardButton($"{page + 1}/{(totalCount / elementsOnPage) + 1}")
             {
-                var subId = await _dbContext.Subscriptions
-                    .Where(subscriber => subscriber.Feed == feed && subscriber.SubscriberId == chat.Id)
-                    .Select(subscriber => subscriber.SubscriptionId).FirstAsync();
+                CallbackData = $"feed|{From.Id}|donothing",
+            });
 
-                _dbContext.Remove(_dbContext.Find<Subscriber>(subId));
-            }
-            else
+            if (nextButton)
             {
-                var subscription = _dbContext.Subscriptions.Create();
-                subscription.Feed = feed;
-                subscription.SubscriberId = chat.Id;
-                
-                _dbContext.Add(subscription);
+                row.Add(new InlineKeyboardButton("➡️")
+                {
+                    CallbackData = $"feed|{From.Id}|page|{query}|{page + 1}",
+                });
             }
                 
-            await _dbContext.SaveChangesAsync();
-            await ShowFeed(feed, chat, from, message);
+            buttons.Add(row);
         }
             
-        #endregion
+        if (editableMessage == null)
+        {
+            await Bot.SendTextMessageAsync(Chat, "Select the feed for viewing details", 0, null,
+                null, true, true, false, 0, replyMarkup: new InlineKeyboardMarkup(buttons));
+        }
+        else
+        {
+            await Bot.EditMessageTextAsync(editableMessage.Chat, editableMessage.MessageId, "Select the feed for viewing details", null, null, false,
+                new InlineKeyboardMarkup(buttons));
+        }
+
+        return true;
     }
+        
+    #endregion
+
+    #region Message handler
+
+    [Update(UpdateFlag.CallbackQuery)]
+    public async Task HandleAction()
+    {
+        if (!RawUpdate.CallbackQuery.Data.StartsWith("feed|"))
+        {
+            return;
+        }
+
+        var data = RawUpdate.CallbackQuery.Data.Split('|');
+        var fromId = Int64.Parse(data[1]);
+        if (fromId != From.Id)
+        {
+            await Bot.AnswerCallbackQueryAsync(RawUpdate.CallbackQuery.Id,
+                "You can't perform this action: command called by another user.", true);
+            return;
+        }
+
+        // Check action.
+        switch (data[2])
+        {
+            case "page":
+                await GenerateMenu(data[3], UInt16.Parse(data[4]), RawUpdate.CallbackQuery.Message);
+                break;
+                
+            case "show":
+                await ShowFeed(Guid.Parse(data[3]), RawUpdate.CallbackQuery.Message.Chat, RawUpdate.CallbackQuery.From);
+                break;
+                
+            case "do":
+                if (RawUpdate.CallbackQuery.From.Id != RawUpdate.CallbackQuery.Message.Chat.Id)
+                {
+                    var userStatus = (await Bot.GetChatMemberAsync(RawUpdate.CallbackQuery.Message.Chat, RawUpdate.CallbackQuery.From.Id)).Status;
+                    var allowedUserStatuses = new ChatMemberStatus[]
+                        {ChatMemberStatus.Administrator, ChatMemberStatus.Creator};
+
+                    if (!allowedUserStatuses.Contains(userStatus))
+                    {
+                        await Bot.AnswerCallbackQueryAsync(RawUpdate.CallbackQuery.Id,
+                            "You can't perform this action: you don't have administrator permissions.", true);
+                        return;
+                    }
+                }
+
+                await ChangeFeedSubscription(Guid.Parse(data[3]), RawUpdate.CallbackQuery.Message.Chat, RawUpdate.CallbackQuery.From, RawUpdate.CallbackQuery.Message);
+                break;
+                
+            case "last":
+                var feed = await _dbContext.FindAsync<Feed>(Guid.Parse(data[3]));
+                var posts = feed.Posts.OrderByDescending(p => p.ReceivedAt).Take(10).ToList();
+                    
+                var messageTextBuilder = new StringBuilder();
+                messageTextBuilder.Append($"Last 10 posts from {feed.Representation(ParseMode.Html)}\n");
+                messageTextBuilder.Append("\n");
+
+                var idx = 1;
+                foreach (var post in posts)
+                {
+                    messageTextBuilder.Append($"{idx}. {post}\n");
+                    idx++;
+                }
+
+                await Bot.SendTextMessageAsync(RawUpdate.CallbackQuery.Message.Chat, messageTextBuilder.ToString(),
+                    0, ParseMode.Html, null, true);
+                break;
+        }
+            
+        await Bot.AnswerCallbackQueryAsync(RawUpdate.CallbackQuery.Id);
+    }
+
+    protected async Task ChangeFeedSubscription(Guid feedId, Chat chat, User from, Message message)
+    {
+        var feed = await _dbContext.FindAsync<Feed>(feedId);
+        if (feed == null)
+        {
+            return;
+        }
+
+        var subscriptionState = await _dbContext.Subscriptions.HasSubscription(chat, feed);
+        if (subscriptionState)
+        {
+            var subId = await _dbContext.Subscriptions
+                .Where(subscriber => subscriber.Feed == feed && subscriber.SubscriberId == chat.Id)
+                .Select(subscriber => subscriber.SubscriptionId).FirstAsync();
+                
+            _dbContext.Remove(_dbContext.Find<Subscriber>(subId));
+        }
+        else
+        {
+            var subscription = _dbContext.Subscriptions.Create();
+            subscription.Feed = feed;
+            subscription.SubscriberId = chat.Id;
+                
+            _dbContext.Add(subscription);
+        }
+
+        await _dbContext.SaveChangesAsync();
+        await ShowFeed(feed, chat, from, message);
+    }
+        
+    #endregion
 }

modules/RichSiteSummary/Handler/StatsHandler.cs

@@ -7,31 +7,30 @@ using Microsoft.EntityFrameworkCore;
 using Telegram.Bot;
 using Telegram.Bot.Types.Enums;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Handler
+namespace Kruzya.TelegramBot.RichSiteSummary.Handler;
+
+public class StatsHandler : AbstractHandler
 {
-    public class StatsHandler : AbstractHandler
+    public StatsHandler(RichSiteSummaryContext dbContext) : base(dbContext)
     {
-        public StatsHandler(RichSiteSummaryContext dbContext) : base(dbContext)
-        {
-        }
+    }
         
-        [Command("rss_stats")]
-        public async Task Execute()
-        {
-            var feedCount = await _dbContext.Feeds.CountAsync();
-            var postsCount = await _dbContext.Posts.CountAsync();
-            var subscriptionsCount = await _dbContext.Subscriptions.CountAsync();
-            var uniqueSubscribers =
-                await _dbContext.Subscriptions.Select(sub => sub.SubscriberId).Distinct().CountAsync();
+    [Command("rss_stats")]
+    public async Task Execute()
+    {
+        var feedCount = await _dbContext.Feeds.CountAsync();
+        var postsCount = await _dbContext.Posts.CountAsync();
+        var subscriptionsCount = await _dbContext.Subscriptions.CountAsync();
+        var uniqueSubscribers =
+            await _dbContext.Subscriptions.Select(sub => sub.SubscriberId).Distinct().CountAsync();
             
-            var textMessage = new StringBuilder();
-            textMessage.Append("ℹ️ In database on this moment:\n");
-            textMessage.Append($"- registered <b>{feedCount} feeds</b>\n");
-            textMessage.Append($"- saved <b>{postsCount} posts</b> for prevent re-sending\n");
-            textMessage.Append(
-                $"- exists <b>{subscriptionsCount} subscriptions on feeds</b> (<b>unique subscribers: {uniqueSubscribers}</b>)");
+        var textMessage = new StringBuilder();
+        textMessage.Append("ℹ️ In database on this moment:\n");
+        textMessage.Append($"- registered <b>{feedCount} feeds</b>\n");
+        textMessage.Append($"- saved <b>{postsCount} posts</b> for prevent re-sending\n");
+        textMessage.Append(
+            $"- exists <b>{subscriptionsCount} subscriptions on feeds</b> (<b>unique subscribers: {uniqueSubscribers}</b>)");
 
-            await Bot.SendTextMessageAsync(Chat, textMessage.ToString(), parseMode: ParseMode.Html);
-        }
+        await Bot.SendTextMessageAsync(Chat, textMessage.ToString(), parseMode: ParseMode.Html);
     }
 }

modules/RichSiteSummary/RichSiteSummary.cs

@@ -7,31 +7,30 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 
-namespace Kruzya.TelegramBot.RichSiteSummary
+namespace Kruzya.TelegramBot.RichSiteSummary;
+
+public class RichSiteSummary : Module
 {
-    public class RichSiteSummary : Module
+    public RichSiteSummary(Core.Core core) : base(core)
     {
-        public RichSiteSummary(Core.Core core) : base(core)
-        {
-        }
+    }
 
-        public override void ConfigureServices(IServiceCollection services)
-        {
-            var connectionString = Configuration.GetConnectionString("RichSiteSummary");
-            services.AddDbContext<RichSiteSummaryContext>(options =>
-                options.UseLazyLoadingProxies()
-                    .UseMySql(connectionString, ServerVersion.AutoDetect(connectionString)));
+    public override void ConfigureServices(IServiceCollection services)
+    {
+        var connectionString = Configuration.GetConnectionString("RichSiteSummary");
+        services.AddDbContext<RichSiteSummaryContext>(options =>
+            options.UseLazyLoadingProxies()
+                .UseMySql(connectionString, ServerVersion.AutoDetect(connectionString)));
 
-            services.AddTelegramBotParameterParser<Feed, DbResolverParameter<Feed, RichSiteSummaryContext>>()
-                .AddTelegramBotParameterParser<Post, DbResolverParameter<Post, RichSiteSummaryContext>>()
-                .AddTelegramBotParameterParser<Subscriber, DbResolverParameter<Subscriber, RichSiteSummaryContext>>();
+        services.AddTelegramBotParameterParser<Feed, DbResolverParameter<Feed, RichSiteSummaryContext>>()
+            .AddTelegramBotParameterParser<Post, DbResolverParameter<Post, RichSiteSummaryContext>>()
+            .AddTelegramBotParameterParser<Subscriber, DbResolverParameter<Subscriber, RichSiteSummaryContext>>();
 
-            services.AddQueue<UserMessage>()
-                .AddQueue<UserUnsubscribe>();
+        services.AddQueue<UserMessage>()
+            .AddQueue<UserUnsubscribe>();
 
-            services.AddHostedService<RssFetch>()
-                .AddHostedService<Unsubscriber>()
-                .AddHostedService<MessageSender>();
-        }
+        services.AddHostedService<RssFetch>()
+            .AddHostedService<Unsubscriber>()
+            .AddHostedService<MessageSender>();
     }
 }

modules/RichSiteSummary/RichSiteSummaryRepositoryExtension.cs

@@ -5,68 +5,67 @@ using Kruzya.TelegramBot.RichSiteSummary.Data;
 using Microsoft.EntityFrameworkCore;
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.RichSiteSummary
+namespace Kruzya.TelegramBot.RichSiteSummary;
+
+internal static class RichSiteSummaryRepositoryExtension
 {
-    internal static class RichSiteSummaryRepositoryExtension
+    #region Subscriber
+
+    /// <summary>
+    /// Searchs the <see cref="Subscriber"/>, who reads a <see cref="Feed"/>.
+    /// </summary>
+    /// <param name="repository"></param>
+    /// <param name="feed"></param>
+    /// <returns>The array with all subscribers.</returns>
+    public static async Task<Subscriber[]> ByFeed(this DbSet<Subscriber> repository, Feed feed)
     {
-        #region Subscriber
-
-        /// <summary>
-        /// Searchs the <see cref="Subscriber"/>, who reads a <see cref="Feed"/>.
-        /// </summary>
-        /// <param name="repository"></param>
-        /// <param name="feed"></param>
-        /// <returns>The array with all subscribers.</returns>
-        public static async Task<Subscriber[]> ByFeed(this DbSet<Subscriber> repository, Feed feed)
-        {
-            return await repository.Where(subscriber => subscriber.Feed == feed)
-                .ToArrayAsync();
-        }
-
-        public static IQueryable<Subscriber> AllSubscriptions(this DbSet<Subscriber> repository, Chat chat)
-        {
-            return repository.Where(entity => entity.SubscriberId == chat.Id);
-        }
-
-        public static async Task<bool> HasSubscription(this DbSet<Subscriber> repository, Chat chat, Feed feed)
-        {
-            return (await repository.Where(subscriber => subscriber.Feed == feed && subscriber.SubscriberId == chat.Id)
-                       .CountAsync()) != 0;
-        }
-
-        #endregion
-        
-        #region Feed
-
-        /// <summary>
-        /// Searchs the <see cref="Feed"/> for fetching.
-        /// </summary>
-        /// <param name="repository"></param>
-        /// <param name="period">The period (in seconds) from last fetching.</param>
-        /// <param name="count">Max results count</param>
-        /// <returns></returns>
-        public static async Task<Feed[]> ForFetching(this DbSet<Feed> repository, UInt16 period, UInt16 count) =>
-            await repository.Where(feed => feed.UpdatedAt < (DateTime.Now - TimeSpan.FromSeconds(period)))
-                .OrderBy(feed => feed.UpdatedAt)
-                .Take(count)
-                .ToArrayAsync();
-
-        /// <summary>
-        /// Searchs the <see cref="Feed"/> for fetching.
-        /// </summary>
-        /// <param name="repository"></param>
-        /// <param name="period">The period (in seconds) from last fetching.</param>
-        /// <returns></returns>
-        public static async Task<Feed[]> ForFetching(this DbSet<Feed> repository, UInt16 period) =>
-            await repository.ForFetching(period, 25);
-
-        #endregion
-        
-        #region Post
-
-        public static async Task<Post> ByFeedAndUrl(this DbSet<Post> repository, string url, Feed feed = null) =>
-            await repository.FirstOrDefaultAsync(post => post.Url == url && (feed == null || post.Feed == feed));
-
-        #endregion
+        return await repository.Where(subscriber => subscriber.Feed == feed)
+            .ToArrayAsync();
     }
+
+    public static IQueryable<Subscriber> AllSubscriptions(this DbSet<Subscriber> repository, Chat chat)
+    {
+        return repository.Where(entity => entity.SubscriberId == chat.Id);
+    }
+
+    public static async Task<bool> HasSubscription(this DbSet<Subscriber> repository, Chat chat, Feed feed)
+    {
+        return (await repository.Where(subscriber => subscriber.Feed == feed && subscriber.SubscriberId == chat.Id)
+            .CountAsync()) != 0;
+    }
+
+    #endregion
+        
+    #region Feed
+
+    /// <summary>
+    /// Searchs the <see cref="Feed"/> for fetching.
+    /// </summary>
+    /// <param name="repository"></param>
+    /// <param name="period">The period (in seconds) from last fetching.</param>
+    /// <param name="count">Max results count</param>
+    /// <returns></returns>
+    public static async Task<Feed[]> ForFetching(this DbSet<Feed> repository, UInt16 period, UInt16 count) =>
+        await repository.Where(feed => feed.UpdatedAt < (DateTime.Now - TimeSpan.FromSeconds(period)))
+            .OrderBy(feed => feed.UpdatedAt)
+            .Take(count)
+            .ToArrayAsync();
+
+    /// <summary>
+    /// Searchs the <see cref="Feed"/> for fetching.
+    /// </summary>
+    /// <param name="repository"></param>
+    /// <param name="period">The period (in seconds) from last fetching.</param>
+    /// <returns></returns>
+    public static async Task<Feed[]> ForFetching(this DbSet<Feed> repository, UInt16 period) =>
+        await repository.ForFetching(period, 25);
+
+    #endregion
+        
+    #region Post
+
+    public static async Task<Post> ByFeedAndUrl(this DbSet<Post> repository, string url, Feed feed = null) =>
+        await repository.FirstOrDefaultAsync(post => post.Url == url && (feed == null || post.Feed == feed));
+
+    #endregion
 }

modules/RichSiteSummary/Service/MessageSender.cs

@@ -9,81 +9,80 @@ using Telegram.Bot;
 using Telegram.Bot.Exceptions;
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Service
+namespace Kruzya.TelegramBot.RichSiteSummary.Service;
+
+public class MessageSender : AbstractTimedHostedService
 {
-    public class MessageSender : AbstractTimedHostedService
+    protected override TimeSpan TimerPeriod => TimeSpan.FromSeconds(1);
+        
+    protected readonly ConcurrentQueue<UserMessage> Queue;
+    protected readonly ConcurrentQueue<UserUnsubscribe> UnsubscribeQueue;
+        
+    public MessageSender(ILogger<MessageSender> logger, IBotInstance bot, ConcurrentQueue<UserMessage> userMessageQueue, ConcurrentQueue<UserUnsubscribe> userUnsubscribeQueue) : base(logger, bot)
     {
-        protected override TimeSpan TimerPeriod => TimeSpan.FromSeconds(1);
+        UnsubscribeQueue = userUnsubscribeQueue;
+        Queue = userMessageQueue;
+    }
 
-        protected readonly ConcurrentQueue<UserMessage> Queue;
-        protected readonly ConcurrentQueue<UserUnsubscribe> UnsubscribeQueue;
-        
-        public MessageSender(ILogger<MessageSender> logger, IBotInstance bot, ConcurrentQueue<UserMessage> userMessageQueue, ConcurrentQueue<UserUnsubscribe> userUnsubscribeQueue) : base(logger, bot)
+    protected override async Task OnRun()
+    {
+        if (Queue.IsEmpty || !Queue.TryDequeue(out var message))
         {
-            UnsubscribeQueue = userUnsubscribeQueue;
-            Queue = userMessageQueue;
+            return;
         }
 
-        protected override async Task OnRun()
+        _logger.LogDebug("Message for {ChatId} dequeued.", message.ChatId.Identifier);
+        try
         {
-            if (Queue.IsEmpty || !Queue.TryDequeue(out var message))
+            if (string.IsNullOrWhiteSpace(message.ImageUrl))
             {
+                await _bot.BotClient.SendTextMessageAsync(message.ChatId, message.Text, 0, message.ParseMode, null,
+                    message.DisableWebPagePreview);
+            }
+
+            else
+            {
+                await _bot.BotClient.SendPhotoAsync(message.ChatId, new InputFileUrl(message.ImageUrl), 0, message.Text,
+                    message.ParseMode, null, false, message.DisableWebPagePreview);
+            }
+        }
+        catch (ApiRequestException e)
+        {
+            _logger.LogDebug("Message for {ChatId} is failed: {error}.", message.ChatId.Identifier, e.Message);
+            if (!e.Message.Contains("bot was blocked by user"))
+            {
+                ReEnqueue(message, e, message.ChatId); // looks like a network issue
                 return;
             }
 
-            _logger.LogDebug("Message for {ChatId} dequeued.", message.ChatId.Identifier);
-            try
+            // User added bot to blacklist.
+            // Unsubscribe him.
+            UnsubscribeQueue.Enqueue(new UserUnsubscribe
             {
-                if (string.IsNullOrWhiteSpace(message.ImageUrl))
-                {
-                    await _bot.BotClient.SendTextMessageAsync(message.ChatId, message.Text, 0, message.ParseMode, null,
-                        message.DisableWebPagePreview);
-                }
-
-                else
-                {
-                    await _bot.BotClient.SendPhotoAsync(message.ChatId, new InputFileUrl(message.ImageUrl), 0, message.Text,
-                        message.ParseMode, null, false, message.DisableWebPagePreview);
-                }
-            }
-            catch (ApiRequestException e)
-            {
-                _logger.LogDebug("Message for {ChatId} is failed: {error}.", message.ChatId.Identifier, e.Message);
-                if (!e.Message.Contains("bot was blocked by user"))
-                {
-                    ReEnqueue(message, e, message.ChatId); // looks like a network issue
-                    return;
-                }
-
-                // User added bot to blacklist.
-                // Unsubscribe him.
-                UnsubscribeQueue.Enqueue(new UserUnsubscribe
-                {
-                    ChatId = message.ChatId
-                });
-            }
-            catch (Exception e)
-            {
-                _logger.LogDebug("Message for {ChatId} is failed: {error}.", message.ChatId.Identifier, e.Message);
-                ReEnqueue(message, e);
-            }
+                ChatId = message.ChatId
+            });
         }
-        
-        private void ReEnqueue(UserMessage message, Exception e = null, ChatId chatId = null)
+        catch (Exception e)
         {
-            if (e != null)
-            {
-                var eMessage = new StringBuilder();
-                eMessage.Append(e.Message);
-                if (chatId != null)
-                {
-                    eMessage.Append($" ({chatId.Identifier})");
-                }
-
-                _logger.LogError(eMessage.ToString());
-            }
-
-            Queue.Enqueue(message);
+            _logger.LogDebug("Message for {ChatId} is failed: {error}.", message.ChatId.Identifier, e.Message);
+            ReEnqueue(message, e);
         }
     }
+        
+    private void ReEnqueue(UserMessage message, Exception e = null, ChatId chatId = null)
+    {
+        if (e != null)
+        {
+            var eMessage = new StringBuilder();
+            eMessage.Append(e.Message);
+            if (chatId != null)
+            {
+                eMessage.Append($" ({chatId.Identifier})");
+            }
+
+            _logger.LogError(eMessage.ToString());
+        }
+
+        Queue.Enqueue(message);
+    }
 }

modules/RichSiteSummary/Service/RssFetch.cs

@@ -20,242 +20,241 @@ using Feed = Kruzya.TelegramBot.RichSiteSummary.Data.Feed;
 
 using CodeHollow.FeedReader.Feeds;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Service
+namespace Kruzya.TelegramBot.RichSiteSummary.Service;
+
+/// <summary>
+/// Performs a RSS feed parsing.
+/// Grabs the all feeds from database.
+///
+/// TODO: move entity grabbing to another service.
+/// </summary>
+public class RssFetch : IHostedService, IDisposable
 {
-    /// <summary>
-    /// Performs a RSS feed parsing.
-    /// Grabs the all feeds from database.
-    ///
-    /// TODO: move entity grabbing to another service.
-    /// </summary>
-    public class RssFetch : IHostedService, IDisposable
+    private Timer _timer;
+        
+    private readonly ILogger _logger;
+    private readonly IServiceScopeFactory _scopeFactory;
+    private readonly ConcurrentQueue<UserMessage> _queue;
+
+    private static TimeSpan TimerPeriod => TimeSpan.FromSeconds(45);
+
+    public RssFetch(ILogger<RssFetch> logger, ConcurrentQueue<UserMessage> queue, IServiceScopeFactory scopeFactory)
     {
-        private Timer _timer;
+        _scopeFactory = scopeFactory;
+        _logger = logger;
+        _queue = queue;
+    }
 
-        private readonly ILogger _logger;
-        private readonly IServiceScopeFactory _scopeFactory;
-        private readonly ConcurrentQueue<UserMessage> _queue;
+    #region IHostedService
+    /// <summary>
+    /// Initializes the RSS fetcher timer.
+    /// </summary>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    public Task StartAsync(CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("RSS fetcher service is starting.");
+        _timer = new Timer(DoFetch, null, TimeSpan.Zero, TimerPeriod);
 
-        private static TimeSpan TimerPeriod => TimeSpan.FromSeconds(45);
+        return Task.CompletedTask;
+    }
 
-        public RssFetch(ILogger<RssFetch> logger, ConcurrentQueue<UserMessage> queue, IServiceScopeFactory scopeFactory)
+    /// <summary>
+    /// Stops the RSS fetcher timer.
+    /// </summary>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("RSS fetcher service is stopping.");
+        _timer?.Change(Timeout.Infinite, 0);
+
+        return Task.CompletedTask;
+    }
+    #endregion
+    #region IDisposable
+    /// <summary>
+    /// Disposes the timer.
+    /// </summary>
+    public void Dispose()
+    {
+        _timer?.Dispose();
+    }
+    #endregion
+
+    /// <summary>
+    /// Performs the job of fetching RSS data.
+    /// </summary>
+    /// <param name="state"></param>
+    private async void DoFetch(object state)
+    {
+        _timer.Change(Timeout.Infinite, 0);
+        _logger.LogDebug("RSS fetcher service is triggered.");
+
+        try
         {
-            _scopeFactory = scopeFactory;
-            _logger = logger;
-            _queue = queue;
-        }
+            using var scope = _scopeFactory.CreateScope();
+            var dbContext = scope.ServiceProvider.GetRequiredService<RichSiteSummaryContext>();
+            var period = scope.ServiceProvider.GetRequiredService<IConfiguration>()
+                .GetValue<ushort>("rssFetchPeriod");
 
-        #region IHostedService
-        /// <summary>
-        /// Initializes the RSS fetcher timer.
-        /// </summary>
-        /// <param name="cancellationToken"></param>
-        /// <returns></returns>
-        public Task StartAsync(CancellationToken cancellationToken)
-        {
-            _logger.LogInformation("RSS fetcher service is starting.");
-            _timer = new Timer(DoFetch, null, TimeSpan.Zero, TimerPeriod);
+            var feeds = await dbContext.Feeds.ForFetching(period);
+            _logger.LogDebug("Received {count} feeds for fetching", new {count = feeds.Length});
 
-            return Task.CompletedTask;
-        }
-
-        /// <summary>
-        /// Stops the RSS fetcher timer.
-        /// </summary>
-        /// <param name="cancellationToken"></param>
-        /// <returns></returns>
-        public Task StopAsync(CancellationToken cancellationToken)
-        {
-            _logger.LogInformation("RSS fetcher service is stopping.");
-            _timer?.Change(Timeout.Infinite, 0);
-
-            return Task.CompletedTask;
-        }
-        #endregion
-        #region IDisposable
-        /// <summary>
-        /// Disposes the timer.
-        /// </summary>
-        public void Dispose()
-        {
-            _timer?.Dispose();
-        }
-        #endregion
-
-        /// <summary>
-        /// Performs the job of fetching RSS data.
-        /// </summary>
-        /// <param name="state"></param>
-        private async void DoFetch(object state)
-        {
-            _timer.Change(Timeout.Infinite, 0);
-            _logger.LogDebug("RSS fetcher service is triggered.");
-
-            try
+            foreach (var feed in feeds)
             {
-                using var scope = _scopeFactory.CreateScope();
-                var dbContext = scope.ServiceProvider.GetRequiredService<RichSiteSummaryContext>();
-                var period = scope.ServiceProvider.GetRequiredService<IConfiguration>()
-                    .GetValue<ushort>("rssFetchPeriod");
+                await ProcessFeed(feed, dbContext);
 
-                var feeds = await dbContext.Feeds.ForFetching(period);
-                _logger.LogDebug("Received {count} feeds for fetching", new {count = feeds.Length});
+                feed.UpdatedAt = DateTime.Now;
+                dbContext.Update(feed);
+            }
 
-                foreach (var feed in feeds)
+            await dbContext.SaveChangesAsync();
+        }
+        finally
+        {
+            _timer.Change(TimerPeriod, TimerPeriod);
+        }
+    }
+
+    #region Feeds
+
+    private async Task ProcessFeed(Feed feed, RichSiteSummaryContext dbContext)
+    {
+        var parsedFeed = await FetchFeed(feed);
+        if (parsedFeed == null)
+        {
+            return;
+        }
+            
+        Post feedPost;
+        var newPosts = new List<Post>();
+        var postsImages = new Dictionary<Post, string>();
+        foreach (var post in parsedFeed.Items)
+        {
+            feedPost = await dbContext.Posts.ByFeedAndUrl(post.Link, feed);
+            if (feedPost != null)
+            {
+                // skip. This post already exists.
+                continue;
+            }
+
+            feedPost = dbContext.Posts.Create();
+            feedPost.Feed = feed;
+            feedPost.Title = post.Title;
+            feedPost.Url = post.Link;
+            feedPost.PostedAt = post.PublishingDate.GetValueOrDefault(DateTime.Now);
+
+            postsImages.Add(feedPost, await FetchImageUrl(post));
+            newPosts.Add(feedPost);
+        }
+
+        if (newPosts.Count > 0)
+        {
+            var subscribers = await dbContext.Subscriptions.ByFeed(feed);
+            foreach (var post in newPosts)
+            {
+                var text = post.MessageText;
+                foreach (var subscriber in subscribers)
                 {
-                    await ProcessFeed(feed, dbContext);
-
-                    feed.UpdatedAt = DateTime.Now;
-                    dbContext.Update(feed);
-                }
-
-                await dbContext.SaveChangesAsync();
-            }
-            finally
-            {
-                _timer.Change(TimerPeriod, TimerPeriod);
-            }
-        }
-
-        #region Feeds
-
-        private async Task ProcessFeed(Feed feed, RichSiteSummaryContext dbContext)
-        {
-            var parsedFeed = await FetchFeed(feed);
-            if (parsedFeed == null)
-            {
-                return;
-            }
-            
-            Post feedPost;
-            var newPosts = new List<Post>();
-            var postsImages = new Dictionary<Post, string>();
-            foreach (var post in parsedFeed.Items)
-            {
-                feedPost = await dbContext.Posts.ByFeedAndUrl(post.Link, feed);
-                if (feedPost != null)
-                {
-                    // skip. This post already exists.
-                    continue;
-                }
-
-                feedPost = dbContext.Posts.Create();
-                feedPost.Feed = feed;
-                feedPost.Title = post.Title;
-                feedPost.Url = post.Link;
-                feedPost.PostedAt = post.PublishingDate.GetValueOrDefault(DateTime.Now);
-
-                postsImages.Add(feedPost, await FetchImageUrl(post));
-                newPosts.Add(feedPost);
-            }
-
-            if (newPosts.Count > 0)
-            {
-                var subscribers = await dbContext.Subscriptions.ByFeed(feed);
-                foreach (var post in newPosts)
-                {
-                    var text = post.MessageText;
-                    foreach (var subscriber in subscribers)
+                    var message = new UserMessage
                     {
-                        var message = new UserMessage
-                        {
-                            ChatId = new ChatId(subscriber.SubscriberId), DisableWebPagePreview = true,
-                            ParseMode = ParseMode.Html, Text = text, ImageUrl = postsImages.GetValueOrDefault(post)
-                        };
+                        ChatId = new ChatId(subscriber.SubscriberId), DisableWebPagePreview = true,
+                        ParseMode = ParseMode.Html, Text = text, ImageUrl = postsImages.GetValueOrDefault(post)
+                    };
 
-                        _queue.Enqueue(message);
-                        _logger.LogDebug("Queued message for {SubscriberId}", subscriber.SubscriberId);
-                    }
+                    _queue.Enqueue(message);
+                    _logger.LogDebug("Queued message for {SubscriberId}", subscriber.SubscriberId);
                 }
             }
         }
+    }
 
-        private async Task<CodeHollow.FeedReader.Feed> FetchFeed(Feed feed)
+    private async Task<CodeHollow.FeedReader.Feed> FetchFeed(Feed feed)
+    {
+        try
+        {
+            return await FeedReader.ReadAsync(feed.Url);
+        }
+        catch (Exception e)
+        {
+            _logger.LogError("Feed {feed} can't be fetched: {error}", feed, e.Message);
+            return null;
+        }
+    }
+
+    #endregion
+
+    #region Image parsing
+
+    private async Task<string> FetchImageUrl(FeedItem item)
+    {
+        var feedItem = item.SpecificItem;
+        if (feedItem is Rss20FeedItem rss20FeedItem)
+        {
+            var enclosure = rss20FeedItem.Enclosure;
+            if (enclosure != null && IsValidImage(enclosure.MediaType))
+            {
+                return enclosure.Url;
+            }
+        }
+
+        return await FetchImageUrl(item.Description);
+    }
+
+    private async Task<string> FetchImageUrl(string description)
+    {
+        if (string.IsNullOrWhiteSpace(description))
+        {
+            return "";
+        }
+
+        using var httpClientHandler = new HttpClientHandler() { AllowAutoRedirect = true };
+        using var httpClient = new HttpClient(httpClientHandler);
+
+        var imgRegEx = new Regex(@"<img[^>]+>");
+        var srcRegEx = new Regex("src=\"([^\"]+)\"");
+        var matches = imgRegEx.Matches(description);
+
+        var img = "";
+        foreach (Match match in matches)
         {
             try
             {
-                return await FeedReader.ReadAsync(feed.Url);
+                var srcData = srcRegEx.Match(match.Value);
+                var content = srcData.Groups[1].Value;
+
+                var response = await httpClient.SendAsync(new HttpRequestMessage(HttpMethod.Head, content));
+                if (response.StatusCode == HttpStatusCode.OK &&
+                    IsValidImage(response.Content.Headers.ContentType.MediaType))
+                {
+                    img = content;
+                    break;
+                }
             }
             catch (Exception e)
             {
-                _logger.LogError("Feed {feed} can't be fetched: {error}", feed, e.Message);
-                return null;
+                _logger.LogError("Caused error when fetching image for RSS post: {error}", e.Message);
             }
         }
 
-        #endregion
-
-        #region Image parsing
-
-        private async Task<string> FetchImageUrl(FeedItem item)
-        {
-            var feedItem = item.SpecificItem;
-            if (feedItem is Rss20FeedItem rss20FeedItem)
-            {
-                var enclosure = rss20FeedItem.Enclosure;
-                if (enclosure != null && IsValidImage(enclosure.MediaType))
-                {
-                    return enclosure.Url;
-                }
-            }
-
-            return await FetchImageUrl(item.Description);
-        }
-
-        private async Task<string> FetchImageUrl(string description)
-        {
-            if (string.IsNullOrWhiteSpace(description))
-            {
-                return "";
-            }
-
-            using var httpClientHandler = new HttpClientHandler() { AllowAutoRedirect = true };
-            using var httpClient = new HttpClient(httpClientHandler);
-
-            var imgRegEx = new Regex(@"<img[^>]+>");
-            var srcRegEx = new Regex("src=\"([^\"]+)\"");
-            var matches = imgRegEx.Matches(description);
-
-            var img = "";
-            foreach (Match match in matches)
-            {
-                try
-                {
-                    var srcData = srcRegEx.Match(match.Value);
-                    var content = srcData.Groups[1].Value;
-
-                    var response = await httpClient.SendAsync(new HttpRequestMessage(HttpMethod.Head, content));
-                    if (response.StatusCode == HttpStatusCode.OK &&
-                        IsValidImage(response.Content.Headers.ContentType.MediaType))
-                    {
-                        img = content;
-                        break;
-                    }
-                }
-                catch (Exception e)
-                {
-                    _logger.LogError("Caused error when fetching image for RSS post: {error}", e.Message);
-                }
-            }
-
-            return img;
-        }
-
-        /// <summary>
-        /// Checks if image is valid for Telegram Bot API.
-        /// </summary>
-        /// <param name="contentType">Content-type for received content</param>
-        /// <returns>True, if Telegram maybe can "use" this image, false if not.</returns>
-        private static bool IsValidImage(string contentType)
-        {
-            return new[]
-            {
-                "image/jpeg",
-                "image/bmp",
-                "image/png"
-            }.Contains(contentType);
-        }
-
-        #endregion
+        return img;
     }
+
+    /// <summary>
+    /// Checks if image is valid for Telegram Bot API.
+    /// </summary>
+    /// <param name="contentType">Content-type for received content</param>
+    /// <returns>True, if Telegram maybe can "use" this image, false if not.</returns>
+    private static bool IsValidImage(string contentType)
+    {
+        return new[]
+        {
+            "image/jpeg",
+            "image/bmp",
+            "image/png"
+        }.Contains(contentType);
+    }
+
+    #endregion
 }

modules/RichSiteSummary/Service/Unsubscriber.cs

@@ -9,41 +9,40 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.Service
+namespace Kruzya.TelegramBot.RichSiteSummary.Service;
+
+public class Unsubscriber : AbstractTimedHostedService
 {
-    public class Unsubscriber : AbstractTimedHostedService
+    protected readonly ConcurrentQueue<UserUnsubscribe> Queue;
+    protected readonly IServiceScopeFactory ScopeFactory;
+
+    protected override TimeSpan TimerPeriod => TimeSpan.FromSeconds(1);
+
+    public Unsubscriber(ILogger<Unsubscriber> logger, IBotInstance bot, ConcurrentQueue<UserUnsubscribe> queue, IServiceScopeFactory scopeFactory) : base(logger, bot)
     {
-        protected readonly ConcurrentQueue<UserUnsubscribe> Queue;
-        protected readonly IServiceScopeFactory ScopeFactory;
+        ScopeFactory = scopeFactory;
+        Queue = queue;
+    }
 
-        protected override TimeSpan TimerPeriod => TimeSpan.FromSeconds(1);
-
-        public Unsubscriber(ILogger<Unsubscriber> logger, IBotInstance bot, ConcurrentQueue<UserUnsubscribe> queue, IServiceScopeFactory scopeFactory) : base(logger, bot)
+    protected override async Task OnRun()
+    {
+        if (Queue.IsEmpty || !Queue.TryDequeue(out var user))
         {
-            ScopeFactory = scopeFactory;
-            Queue = queue;
+            return;
         }
 
-        protected override async Task OnRun()
-        {
-            if (Queue.IsEmpty || !Queue.TryDequeue(out var user))
-            {
-                return;
-            }
+        await UnsubscribeUser(user.ChatId);
+    }
 
-            await UnsubscribeUser(user.ChatId);
-        }
+    private async Task UnsubscribeUser(ChatId chatId)
+    {
+        using var scope = ScopeFactory.CreateScope();
+        var dbContext = scope.ServiceProvider.GetRequiredService<RichSiteSummaryContext>();
 
-        private async Task UnsubscribeUser(ChatId chatId)
-        {
-            using var scope = ScopeFactory.CreateScope();
-            var dbContext = scope.ServiceProvider.GetRequiredService<RichSiteSummaryContext>();
-
-            var subscriptions = dbContext.Subscriptions;
-            subscriptions.RemoveRange(
-                subscriptions.Where(s => s.SubscriberId == chatId.Identifier)
-                );
-            await dbContext.SaveChangesAsync();
-        }
+        var subscriptions = dbContext.Subscriptions;
+        subscriptions.RemoveRange(
+            subscriptions.Where(s => s.SubscriberId == chatId.Identifier)
+        );
+        await dbContext.SaveChangesAsync();
     }
 }

modules/RichSiteSummary/UrchinTrackingModule/UtmParameters.cs

@@ -1,11 +1,10 @@
-namespace Kruzya.TelegramBot.RichSiteSummary.UrchinTrackingModule
+namespace Kruzya.TelegramBot.RichSiteSummary.UrchinTrackingModule;
+
+public struct UtmParameters
 {
-    public struct UtmParameters
-    {
-        public string Source;
-        public string Type;
-        public string Campaign;
-        public string Term;
-        public string Content;
-    }
+    public string Source;
+    public string Type;
+    public string Campaign;
+    public string Term;
+    public string Content;
 }

modules/RichSiteSummary/UrchinTrackingModule/UtmUtility.cs

@@ -3,49 +3,48 @@ using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Web;
 
-namespace Kruzya.TelegramBot.RichSiteSummary.UrchinTrackingModule
+namespace Kruzya.TelegramBot.RichSiteSummary.UrchinTrackingModule;
+
+public class UtmUtility
 {
-    public class UtmUtility
+    public static string ApplyParameters(string url, UtmParameters parameters)
+        => ApplyParameters(new Uri(url), parameters);
+
+    public static string ApplyParameters(Uri uri, UtmParameters parameters)
     {
-        public static string ApplyParameters(string url, UtmParameters parameters)
-            => ApplyParameters(new Uri(url), parameters);
+        var query = HttpUtility.ParseQueryString(uri.Query);
 
-        public static string ApplyParameters(Uri uri, UtmParameters parameters)
+        SetIfNotNull(query, "utm_source", parameters.Source);
+        SetIfNotNull(query, "utm_medium", parameters.Type);
+        SetIfNotNull(query, "utm_campaign", parameters.Campaign);
+        SetIfNotNull(query, "utm_term", parameters.Term);
+        SetIfNotNull(query, "utm_content", parameters.Content);
+
+        var uriBuilder = new UriBuilder(uri);
+        uriBuilder.Query = BuildQueryString(query);
+        return uriBuilder.ToString();
+    }
+
+    protected static string BuildQueryString(NameValueCollection query)
+    {
+        var queryParameters = new List<string>();
+
+        foreach (var keyName in query.AllKeys)
         {
-            var query = HttpUtility.ParseQueryString(uri.Query);
-
-            SetIfNotNull(query, "utm_source", parameters.Source);
-            SetIfNotNull(query, "utm_medium", parameters.Type);
-            SetIfNotNull(query, "utm_campaign", parameters.Campaign);
-            SetIfNotNull(query, "utm_term", parameters.Term);
-            SetIfNotNull(query, "utm_content", parameters.Content);
-
-            var uriBuilder = new UriBuilder(uri);
-            uriBuilder.Query = BuildQueryString(query);
-            return uriBuilder.ToString();
+            var value = query[keyName];
+            queryParameters.Add($"{HttpUtility.UrlEncode(keyName)}={HttpUtility.UrlEncode(value)}");
         }
 
-        protected static string BuildQueryString(NameValueCollection query)
+        return String.Join('&', queryParameters);
+    }
+        
+    protected static void SetIfNotNull(NameValueCollection queryParameteters, string key, string value)
+    {
+        if (string.IsNullOrWhiteSpace(value))
         {
-            var queryParameters = new List<string>();
-
-            foreach (var keyName in query.AllKeys)
-            {
-                var value = query[keyName];
-                queryParameters.Add($"{HttpUtility.UrlEncode(keyName)}={HttpUtility.UrlEncode(value)}");
-            }
-
-            return String.Join('&', queryParameters);
+            return;
         }
             
-        protected static void SetIfNotNull(NameValueCollection queryParameteters, string key, string value)
-        {
-            if (string.IsNullOrWhiteSpace(value))
-            {
-                return;
-            }
-            
-            queryParameteters.Set(key, value);
-        }
+        queryParameteters.Set(key, value);
     }
 }

modules/RichSiteSummary/UserMessage.cs

@@ -1,14 +1,13 @@
 using Telegram.Bot.Types;
 using Telegram.Bot.Types.Enums;
 
-namespace Kruzya.TelegramBot.RichSiteSummary
+namespace Kruzya.TelegramBot.RichSiteSummary;
+
+public struct UserMessage
 {
-    public struct UserMessage
-    {
-        public ChatId ChatId;
-        public string Text;
-        public ParseMode ParseMode;
-        public bool DisableWebPagePreview;
-        public string ImageUrl;
-    }
+    public ChatId ChatId;
+    public string Text;
+    public ParseMode ParseMode;
+    public bool DisableWebPagePreview;
+    public string ImageUrl;
 }

modules/RichSiteSummary/UserUnsubscribe.cs

@@ -1,9 +1,8 @@
 using Telegram.Bot.Types;
 
-namespace Kruzya.TelegramBot.RichSiteSummary
+namespace Kruzya.TelegramBot.RichSiteSummary;
+
+public struct UserUnsubscribe
 {
-    public struct UserUnsubscribe
-    {
-        public ChatId ChatId;
-    }
+    public ChatId ChatId;
 }

modules/UrlLimitations/MessageExtension.cs

@@ -5,46 +5,46 @@ using Telegram.Bot;
 using Telegram.Bot.Types;
 using Telegram.Bot.Types.Enums;
 
-namespace Kruzya.TelegramBot.UrlLimitations
+namespace Kruzya.TelegramBot.UrlLimitations;
+
+public static class MessageExtension
 {
-    public static class MessageExtension
+    public static async Task<bool> HasUnknownMention(this Message message, ITelegramBotClient bot)
     {
-        public static async Task<bool> HasUnknownMention(this Message message, ITelegramBotClient bot)
+        foreach (var mention in message.Entities.Where(e =>
+                     e.Type == MessageEntityType.Mention || e.Type == MessageEntityType.TextMention))
         {
-            foreach (var mention in message.Entities.Where(e =>
-                e.Type == MessageEntityType.Mention || e.Type == MessageEntityType.TextMention))
+            long userId = 0;
+            if (mention.Type == MessageEntityType.TextMention)
             {
-                long userId = 0;
-                if (mention.Type == MessageEntityType.TextMention)
+                userId = mention.User.Id;
+            }
+            else
+            {
+                try
                 {
-                    userId = mention.User.Id;
-                }
-                else
-                {
-                    try
-                    {
-                        var chat = await bot.GetChatAsync(
-                            new ChatId(message.Text.Substring(mention.Offset, mention.Length)));
+                    var chat = await bot.GetChatAsync(
+                        new ChatId(message.Text.Substring(mention.Offset, mention.Length)));
 
-                        if (chat != null)
+                    if (chat != null)
+                    {
+                        if (chat.Type != ChatType.Private)
                         {
-                            if (chat.Type != ChatType.Private)
-                            {
-                                return true;
-                            }
-
-                            userId = Convert.ToInt64(chat.Id);
+                            return true;
                         }
-                    }
-                    catch (Exception)
-                    {
-                        return true;
+
+                        userId = Convert.ToInt64(chat.Id);
                     }
                 }
+                catch (Exception)
+                {
+                    return true;
+                }
+            }
 
-                var status = (await bot.GetChatMemberAsync(message.Chat, userId)).Status;
+            var status = (await bot.GetChatMemberAsync(message.Chat, userId)).Status;
 
-                if ((new ChatMemberStatus[]
+            if ((new ChatMemberStatus[]
                 {
                     ChatMemberStatus.Administrator, ChatMemberStatus.Creator, ChatMemberStatus.Member,
                     ChatMemberStatus.Restricted
@@ -52,12 +52,11 @@ namespace Kruzya.TelegramBot.UrlLimitations
                     // i'm not sure about "Restricted"
                     // maybe leaved members with some restrictions also can be "Restricted".
                 }).Any(e => e == status) == false)
-                {
-                    return true;
-                }
+            {
+                return true;
             }
-
-            return false;
         }
+
+        return false;
     }
 }

modules/UrlLimitations/MessageHandler.cs

@@ -11,49 +11,48 @@ using Telegram.Bot;
 using Telegram.Bot.Types;
 using Telegram.Bot.Types.Enums;
 
-namespace Kruzya.TelegramBot.UrlLimitations
-{
-    public class MessageHandler : BotEventHandler
-    {
-        protected ILogger Logger;
-        protected readonly CoreContext dbCtx;
+namespace Kruzya.TelegramBot.UrlLimitations;
 
-        public MessageHandler(ILogger<MessageHandler> logger, CoreContext coreContext)
+public class MessageHandler : BotEventHandler
+{
+    protected ILogger Logger;
+    protected readonly CoreContext dbCtx;
+
+    public MessageHandler(ILogger<MessageHandler> logger, CoreContext coreContext)
+    {
+        Logger = logger;
+        dbCtx = coreContext;
+    }
+
+    [InChat(InChat.Public)]
+    [Message(MessageFlag.HasText)]
+    public async Task OnMessageReceived()
+    {
+        var option = await dbCtx.UserValues.FindOption(Chat.Id, From.Id, "urlLimitations.messagesAfterJoin");
+        if (option == null)
         {
-            Logger = logger;
-            dbCtx = coreContext;
+            return;
         }
 
-        [InChat(InChat.Public)]
-        [Message(MessageFlag.HasText)]
-        public async Task OnMessageReceived()
+        var messageCount = option.GetValue<UInt16>();
+        if (messageCount > 10)
         {
-            var option = await dbCtx.UserValues.FindOption(Chat.Id, From.Id, "urlLimitations.messagesAfterJoin");
-            if (option == null)
-            {
-                return;
-            }
+            dbCtx.UserValues.Remove(option);
+            return;
+        }
 
-            var messageCount = option.GetValue<UInt16>();
-            if (messageCount > 10)
-            {
-                dbCtx.UserValues.Remove(option);
-                return;
-            }
-
-            option.SetValue(messageCount + 1);
-            var message = RawUpdate.Message;
-            if (message.Entities.Count(e => e.Type == MessageEntityType.Url || e.Type == MessageEntityType.TextLink) >
-                0 || await message.HasUnknownMention(Bot))
-            {
-                var targetChat = new ChatId(Chat.Id);
-                Task.WaitAll(
-                    Bot.BanChatMemberAsync(new ChatId(Chat.Id), From.Id, DateTime.Now.AddDays(1)),
-                    Bot.DeleteMessageAsync(targetChat, message.MessageId),
-                    Bot.SendTextMessageAsync(targetChat,
+        option.SetValue(messageCount + 1);
+        var message = RawUpdate.Message;
+        if (message.Entities.Count(e => e.Type == MessageEntityType.Url || e.Type == MessageEntityType.TextLink) >
+            0 || await message.HasUnknownMention(Bot))
+        {
+            var targetChat = new ChatId(Chat.Id);
+            Task.WaitAll(
+                Bot.BanChatMemberAsync(new ChatId(Chat.Id), From.Id, DateTime.Now.AddDays(1)),
+                Bot.DeleteMessageAsync(targetChat, message.MessageId),
+                Bot.SendTextMessageAsync(targetChat,
                     $"Member {From.ToHtml(true)} has been banned.\n<b>Reason</b>: <pre>Spam suspicion</pre>", parseMode: ParseMode.Html)
-                );
-            }
+            );
         }
     }
 }

modules/UrlLimitations/UrlLimitations.cs

@@ -1,11 +1,10 @@
 using Kruzya.TelegramBot.Core;
 
-namespace Kruzya.TelegramBot.UrlLimitations
+namespace Kruzya.TelegramBot.UrlLimitations;
+
+public class UrlLimitations : Module
 {
-    public class UrlLimitations : Module
+    public UrlLimitations(Core.Core core) : base(core)
     {
-        public UrlLimitations(Core.Core core) : base(core)
-        {
-        }
     }
 }

modules/UrlLimitations/UserJoinHandler.cs

@@ -6,24 +6,23 @@ using BotFramework.Enums;
 using Kruzya.TelegramBot.Core.Data;
 using Kruzya.TelegramBot.Core.Extensions;
 
-namespace Kruzya.TelegramBot.UrlLimitations
+namespace Kruzya.TelegramBot.UrlLimitations;
+
+public class UserJoinHandler : BotEventHandler
 {
-    public class UserJoinHandler : BotEventHandler
+    protected readonly CoreContext dbCtx;
+        
+    public UserJoinHandler(CoreContext coreContext)
     {
-        protected readonly CoreContext dbCtx;
+        dbCtx = coreContext;
+    }
 
-        public UserJoinHandler(CoreContext coreContext)
-        {
-            dbCtx = coreContext;
-        }
-
-        [InChat(InChat.Public)]
-        [Message(MessageFlag.HasNewChatMembers)]
-        public async Task OnChatMembersAdded()
-        {
-            foreach (var member in RawUpdate.Message.NewChatMembers)
-                await dbCtx.UserValues.SetOptionValue<UInt16>(Chat.Id, member.Id, "urlLimitations.messagesAfterJoin",
-                    0);
-        }
+    [InChat(InChat.Public)]
+    [Message(MessageFlag.HasNewChatMembers)]
+    public async Task OnChatMembersAdded()
+    {
+        foreach (var member in RawUpdate.Message.NewChatMembers)
+            await dbCtx.UserValues.SetOptionValue<UInt16>(Chat.Id, member.Id, "urlLimitations.messagesAfterJoin",
+                0);
     }
 }

modules/UserGroupTag/Handler.cs

@@ -14,94 +14,93 @@ using Telegram.Bot;
 using Telegram.Bot.Types;
 using Telegram.Bot.Types.Enums;
 
-namespace UserGroupTag
+namespace UserGroupTag;
+
+public class Handler : BotEventHandler
 {
-    public class Handler : BotEventHandler
+    private readonly CoreContext _db;
+    private readonly ICacheStorage<long, User> _userCache;
+
+    public Handler(CoreContext db, ICacheStorage<long, User> userCache)
     {
-        private readonly CoreContext _db;
-        private readonly ICacheStorage<long, User> _userCache;
+        _db = db;
+        _userCache = userCache;
+    }
 
-        public Handler(CoreContext db, ICacheStorage<long, User> userCache)
+    [InChat(InChat.Public)]
+    [ParametrizedCommand("add_group", CommandParseMode.Both)]
+    public async Task HandleAddGroup(string groupName)
+    {
+        // var groupName = group.Text;
+        var repliedMessage = RawUpdate.Message!.ReplyToMessage;
+        if (repliedMessage == null || repliedMessage.From!.IsBot || !(await Bot.CanPunishMember(Chat, From)) || string.IsNullOrEmpty(groupName))
         {
-            _db = db;
-            _userCache = userCache;
+            return;
         }
 
-        [InChat(InChat.Public)]
-        [ParametrizedCommand("add_group", CommandParseMode.Both)]
-        public async Task HandleAddGroup(string groupName)
+        var from = repliedMessage.From;
+        var fromId = from.Id;
+        var chatId = Chat!.Id;
+            
+        var userGroupOption = await _db.UserValues.FindOrCreateOption(Chat.Id, "userGroups");
+        var tagDictionary = userGroupOption.GetValue(new Dictionary<string, List<long>>());
+
+        var memberList = tagDictionary.GetValueOrDefault(groupName, new List<long>());
+        if (memberList.Contains(fromId))
         {
-            // var groupName = group.Text;
-            var repliedMessage = RawUpdate.Message!.ReplyToMessage;
-            if (repliedMessage == null || repliedMessage.From!.IsBot || !(await Bot.CanPunishMember(Chat, From)) || string.IsNullOrEmpty(groupName))
-            {
-                return;
-            }
-
-            var from = repliedMessage.From;
-            var fromId = from.Id;
-            var chatId = Chat!.Id;
-            
-            var userGroupOption = await _db.UserValues.FindOrCreateOption(Chat.Id, "userGroups");
-            var tagDictionary = userGroupOption.GetValue(new Dictionary<string, List<long>>());
-
-            var memberList = tagDictionary.GetValueOrDefault(groupName, new List<long>());
-            if (memberList.Contains(fromId))
-            {
-                await Bot.SendTextMessageAsync(chatId, $"{from.ToHtml()} уже находится в группе {groupName}", 
-                    parseMode: ParseMode.Html);
-                return;
-            }
-            memberList.Add(repliedMessage.From.Id);
-            tagDictionary[groupName] = memberList;
-            
-            userGroupOption.SetValue(tagDictionary);
-            _db.AddOrUpdate(userGroupOption);
-
-            _userCache.SetValue(repliedMessage.From.Id, repliedMessage.From, Int32.MaxValue);
-            await Bot.SendTextMessageAsync(chatId, $"{from.ToHtml()} добавлен в группу {groupName}", 
+            await Bot.SendTextMessageAsync(chatId, $"{from.ToHtml()} уже находится в группе {groupName}", 
                 parseMode: ParseMode.Html);
+            return;
         }
+        memberList.Add(repliedMessage.From.Id);
+        tagDictionary[groupName] = memberList;
             
-        [InChat(InChat.Public)]
-        [ParametrizedCommand("tag_group", CommandParseMode.Both)]
-        public async Task HandleTagGroup(string groupName)
+        userGroupOption.SetValue(tagDictionary);
+        _db.AddOrUpdate(userGroupOption);
+
+        _userCache.SetValue(repliedMessage.From.Id, repliedMessage.From, Int32.MaxValue);
+        await Bot.SendTextMessageAsync(chatId, $"{from.ToHtml()} добавлен в группу {groupName}", 
+            parseMode: ParseMode.Html);
+    }
+
+    [InChat(InChat.Public)]
+    [ParametrizedCommand("tag_group", CommandParseMode.Both)]
+    public async Task HandleTagGroup(string groupName)
+    {
+        if (string.IsNullOrEmpty(groupName))
         {
-            if (string.IsNullOrEmpty(groupName))
-            {
-                return;
-            }
-
-            var userGroupOption = await _db.UserValues.FindOption(Chat.Id, "userGroups");
-
-            var userList = userGroupOption?.GetValue<Dictionary<string, List<long>>>()?[groupName];
-            if (userList == null || userList.Count == 0)
-            {
-                return;
-            }
-
-            var msg = new HtmlString()
-                .Text("Пользователь ")
-                .UserMention(From)
-                .Text($" призывает группу пользователей {groupName}: ");
-            foreach (var userId in userList)
-            {
-                msg.UserMention(await GetUser(userId, Chat)).Text(", ");
-            }
-
-            await Bot.SendTextMessageAsync(Chat.Id, msg.ToString().TrimEnd(',', ' '), parseMode: ParseMode.Html);
+            return;
         }
 
-        protected async Task<User> GetUser(long userId, Chat chat)
+        var userGroupOption = await _db.UserValues.FindOption(Chat.Id, "userGroups");
+
+        var userList = userGroupOption?.GetValue<Dictionary<string, List<long>>>()?[groupName];
+        if (userList == null || userList.Count == 0)
         {
-            User user;
-            if (!_userCache.TryGetValue(userId, out user))
-            {
-                user = (await Bot.GetChatMemberAsync(Chat.Id, userId)).User;
-                _userCache.SetValue(userId, user, Int32.MaxValue);
-            }
-
-            return user;
+            return;
         }
+
+        var msg = new HtmlString()
+            .Text("Пользователь ")
+            .UserMention(From)
+            .Text($" призывает группу пользователей {groupName}: ");
+        foreach (var userId in userList)
+        {
+            msg.UserMention(await GetUser(userId, Chat)).Text(", ");
+        }
+
+        await Bot.SendTextMessageAsync(Chat.Id, msg.ToString().TrimEnd(',', ' '), parseMode: ParseMode.Html);
+    }
+
+    protected async Task<User> GetUser(long userId, Chat chat)
+    {
+        User user;
+        if (!_userCache.TryGetValue(userId, out user))
+        {
+            user = (await Bot.GetChatMemberAsync(Chat.Id, userId)).User;
+            _userCache.SetValue(userId, user, Int32.MaxValue);
+        }
+
+        return user;
     }
 }

modules/UserGroupTag/UserGroupTag.cs

@@ -1,9 +1,8 @@
 using Kruzya.TelegramBot.Core;
 
-namespace UserGroupTag
+namespace UserGroupTag;
+
+public class UserGroupTag : Module
 {
-    public class UserGroupTag : Module
-    {
-        public UserGroupTag(Core core) : base(core) { }
-    }
+    public UserGroupTag(Core core) : base(core) { }
 }