ThreadLocal vs AsyncLocal (.Net)

        // shared variables
        // private static ThreadLocal<int> local = new ThreadLocal<int>();//output 53000 0;

        private static AsyncLocal<int> local = new AsyncLocal<int>();//output 53000 53000;

        private static void Main(string[] args)
        {
            // declare a delegate
            Action act = async () =>
             {
                 await RunAsync();
             };

            // action delegate
            act();

            Console.Read();
        }

        private static async Task RunAsync()
        {
            local.Value = 53000;//set values

            Console.WriteLine($"Before await：{nameof(local)} = {local.Value}");
            await Task.Delay(50); //await 50 miniseconds

            Console.WriteLine($"After await：{nameof(local)} = {local.Value}");
        }