static void Main(string[] args)

        {

            //   异步同步

            Console.WriteLine("我是主线程，线程ID：{0}", Thread.CurrentThread.ManagedThreadId);

            //asd();

            TaskMethod();

            Console.WriteLine("Hello World!");

            string str = Console.ReadLine();

            Console.WriteLine(str);

             str = Console.ReadLine();

            Console.WriteLine(str);

             str = Console.ReadLine();

            Console.WriteLine(str);

             str = Console.ReadLine();

            Console.WriteLine(str);

            Console.ReadLine();

        }

        static async  void TaskMethod()

        {

            await Task.Run(() =>

            {

                Thread.Sleep();

            });

            Console.WriteLine();

        }