C#異步委托的使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Runtime.Remoting.Messaging;

namespace 異步委托
{
    /// <summary>
    /// 說明異步委托調用時會產生一個新的線程，不會阻塞主線程，
    /// 前提是使用回調函數，而不是直接使用委托的.endinvoke方法獲取結果
    /// </summary>
    class Program
    {
        public delegate int AddDel(int x, int y);

        static void Main(string[] args)
        {
            //定義委托
            AddDel addDel = new AddDel(AddFunc);
            Console.WriteLine("主線程開始執行...{0}",Thread.CurrentThread.ManagedThreadId);
            //開始異步調用委托
            addDel.BeginInvoke(2, 3, Callback, 2);  //第三個參數回調函數，第四個參數，額外參數
            Console.WriteLine("主線程執行完畢!");
            Console.ReadKey();
        }

        static int AddFunc(int x, int y)
        {
            Console.WriteLine("子線程在執行:{0}",Thread.CurrentThread.ManagedThreadId);
            Thread.Sleep(3000);
            return x + y;
        }

        static void Callback(IAsyncResult ar)
        {
            AsyncResult asy = (AsyncResult)ar;
            //獲取代理信息
            AddDel addDel = (AddDel)asy.AsyncDelegate;
            //獲取返回結果
            int result = addDel.EndInvoke(ar);
            //獲取額外參數
            int otherData = (int)asy.AsyncState;

            Console.WriteLine("子線程執行完畢!{0},執行結果:{1},額外參數:{2}",Thread.CurrentThread.ManagedThreadId
                                    ,result,otherData);

        }
    }
}