C# 轮循回调

class Program

    {

        static void Main(string[] args)

        {

            Func<int> func = new Func<int>(GetInt);



            var iar = func.BeginInvoke(new AsyncCallback(Show), null);

            while (!iar.IsCompleted)

            {

                Thread.Sleep(1000);

                Console.WriteLine("收到了您的提示！");

            }

            Console.WriteLine("处理结果为{0}！",func.EndInvoke(iar));

            Console.ReadKey();

        }



        private static void Show(IAsyncResult iar)

        {

            while (iar.IsCompleted)

            {

                Console.WriteLine("执行完毕！");

                break;

            }

        }



        private static int GetInt()

        {

            for (var i = 0; i < 10; i++)

            {

                Console.WriteLine("请稍等，我正在执行，需要点时间");

                Thread.Sleep(1000);

            }

            return 1;

        }



    }

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