asp.net 异步处理

#region   异步测试
        //委托
        public delegate void PrintDelegate(string s);
        [WebMethod]
        public string yibu()
        {
            //主线程
            PrintDelegate printDelegate = Print;
            printDelegate.BeginInvoke("", PrintComeplete, printDelegate);
            return "OK";
        }

        public static void Print(string s)
        {
            //"异步线程开始执行 逻辑方法在此写"
            //Thread.Sleep(5000);
             
        }
        //回调方法要求
        //1.返回类型为void
        //2.只有一个参数IAsyncResult
        public static void PrintComeplete(IAsyncResult result)
        {
            (result.AsyncState as PrintDelegate).EndInvoke(result);
            //Console.WriteLine("当前线程结束." + result.AsyncState.ToString());
        }
        #endregion