telegram-bot/Core/ThreadSafeRandom.cs

using System;

namespace Kruzya.TelegramBot.Core;

public class ThreadSafeRandom
{
    private static readonly Random Global = new();
    [ThreadStatic] private static Random _local;

    public int Next()
    {
        CheckLocal();

        return _local.Next();
    }

    public int Next(int minValue, int maxValue)
    {
        CheckLocal();

        return _local.Next(minValue, maxValue);
    }

    public int Next(int maxValue)
    {
        CheckLocal();

        return _local.Next(maxValue);
    }

    private static void CheckLocal()
    {
        if (_local == null)
        {
            int seed;
            lock (Global)
            {
                seed = Global.Next();
            }
            _local = new Random(seed);
        }
    }
}