telegram-bot/Core/Data/BotUserValue.cs

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Kruzya.TelegramBot.Core.Data;

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)
    {
        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, 
            DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull });
        ValueType = value.GetType().FullName;
    }
}