List shuffle (randomizer)

ListShuffleExtension.cs

public static class ThreadSafeRandom
    {
        [ThreadStatic]
        private static Random _local;

        public static Random ThisThreadsRandom => _local ?? (_local = new Random(unchecked(Environment.TickCount * 31 + Thread.CurrentThread.ManagedThreadId)));
    }
    
    public static class ListShuffleExtension
    {
        public static void Shuffle<T>(this IList<T> list)
        {
            var n = list.Count;
            while (n > 1)
            {
                n--;
                var k = ThreadSafeRandom.ThisThreadsRandom.Next(n + 1);
                T value = list[k];
                list[k] = list[n];
                list[n] = value;
            }
        }
    }