telegram-bot/Core/Data/BotUserValue.cs

using System;
using System.ComponentModel.DataAnnotations;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text.Json;
using System.Xml.Serialization;

namespace Kruzya.TelegramBot.Core.Data
{
    public class BotUserValue
    {
        [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
            {
                return JsonSerializer.Deserialize<T>(new ReadOnlySpan<byte>(Value));
            }
            catch (Exception)
            {
                return defVal;
            }
        }

        public void SetValue<T>(T value)
        {
            Value = JsonSerializer.SerializeToUtf8Bytes(value, new JsonSerializerOptions { WriteIndented = false, 
                IgnoreNullValues = true });
            ValueType = value.GetType().FullName;
        }
    }
}