also need export Telegram types

Core/Service/CoreManager.cs

@@ -2,7 +2,9 @@
 using Kruzya.TelegramBot.Core.Attributes;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
+using Newtonsoft.Json;
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.Serialization;
 using System.Threading;
@@ -47,7 +49,20 @@ namespace Kruzya.TelegramBot.Core.Service
                 .Where(definedType => definedType.GetAttribute<AllowedSerializableTypeAttribute>() != null)
                 .ToDictionary(type => type.GetAttribute<AllowedSerializableTypeAttribute>().Name);
 
-            foreach (var pair in allowedSerializationTypes)
+            // Also need allow any Telegram Bot API type.
+            var telegramTypes = typeof(Telegram.Bot.Types.Update).Assembly.ExportedTypes
+                .Where(definedType => definedType.GetAttribute<JsonObjectAttribute>() != null)
+                .ToDictionary(type => type.FullName);
+
+            var mergedDictionaryTypes = new List<IDictionary<string, Type>>
+                {
+                    telegramTypes,
+                    allowedSerializationTypes
+                }
+                .SelectMany(dict => dict)
+                .ToDictionary(pair => pair.Key, pair => pair.Value);
+
+            foreach (var pair in mergedDictionaryTypes)
             {
                 binder.RegisterAllowedType(pair.Key, pair.Value);
             }