改頭換面

using System;

namespace WindowsApplication1
{
 /// <summary>
 /// Async2 的摘要描述。
 /// C#中異步回調，調用方法後，由異步方法Handle通知主程序。
 ///
 /// </summary>
 public delegate void AsynCall(int iTime);
  public class Async2
 {
  public Async2()
  {
   //
   // TODO: 在此加入建構函式的程式碼
   //
  }

  public void MyMethod1(int iTime)
  {
   Console.WriteLine("--MyMethod Begin");
   System.Threading.Thread.Sleep(iTime);
   Console.WriteLine("Now is:"+System.DateTime.Now);
   Console.WriteLine("--MyMethod End");
  }

  public void MyAsync(int iTime)
  {
   Console.WriteLine("**MyAsync Begin");
   System.Threading.Thread.Sleep(iTime);
   Console.WriteLine("Now is:"+System.DateTime.Now);
   Console.WriteLine("**MyAsync End");
  }

  public void AsyncHandle(IAsyncResult iar)
  {
   //while(!iar.IsCompleted)
    //System.Threading.Thread.Sleep(10);
   if(iar.IsCompleted)
   {
    Console.WriteLine("Async Handle found the Async is end!");
    AsynCall ac=(AsynCall)iar.AsyncState;
    ac.EndInvoke(iar);
   }
  }
///*
  [STAThread]
  public static void Main()
  {
   Async2 x=new Async2();
   Console.WriteLine("Now is:"+System.DateTime.Now);
   AsynCall ac=new AsynCall(x.MyAsync);
   AsyncCallback acb=new AsyncCallback(x.AsyncHandle);//定義Handle
   IAsyncResult iar=ac.BeginInvoke( 6000,acb,ac);//開始執行異步，並轉交Handle.

   x.MyMethod1(2000);
 
   Console.WriteLine("--The Main Method was ended at:"+System.DateTime.Now);
  }
//*/
 }
}