使用AsyncCallback处理异步调用

using System.Threading;
using System;
using System.Runtime.Remoting.Messaging; //不要忘记该引用，AsyncResult（异布调用的结果）

 

namespace SyncDelegate
{
    public delegate int BinaryOp(int x, int y);

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("***** Synch Delegate Review *****");
                        
            Console.WriteLine("Main() invoked on thread {0}.",
              Thread.CurrentThread.ManagedThreadId);

            BinaryOp b = new BinaryOp(Add);

         
          IAsyncResult iftAR= b.BeginInvoke(10, 10,new AsyncCallback(AddComplete),"Main() thanks you for adding these numbers"); //使用AsyncCallback实现异步回调:引用在异步操作完成时调用的回调方法。
          Console.ReadLine();
 
           
         
        }

        static void AddComplete(IAsyncResult itfAR)//异步操作完成时执行的方法
        {
        Console.WriteLine("AddComplete() invoked on thread {0}", Thread.CurrentThread.ManagedThreadId);
        Console.WriteLine("addition is complete");

        AsyncResult ar = (AsyncResult)itfAR; //AsyncResult封装对委托的异步操作的结果
        BinaryOp b = (BinaryOp)ar.AsyncDelegate;//AsyncDelegate获取原委托对象
        Console.WriteLine("10+10 is {0}", b.EndInvoke(itfAR));

        string msg = (string)itfAR.AsyncState;//AsyncState获取主线程传入的数据
        Console.WriteLine(msg);
        
        }

 

        #region Very time consuming addition!
        static int Add(int x, int y)
        {
           Console.WriteLine("Add() invoked on thread {0}.",
           Thread.CurrentThread.ManagedThreadId);

           Thread.Sleep(3000);
           return x + y;
        }
        #endregion
    }
}