基于委托的C#异步编程的一个小例子 带有回调函数的例子

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace AsyncCallbackDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            objMyCal = ExecuteTask;
        }
        //定义一个委托
        public delegate int MyCalculator(int num,int ms);

        //根据委托定义方法，返回一个数的平方
        private int ExecuteTask(int num,int ms)
        {
            Thread.Sleep(ms);
            return num * num;
        }
        MyCalculator objMyCal = null;
        private void button1_Click(object sender, EventArgs e)
        {
         
            for (int i = 0; i < 11; i++)
            {
                //定义回调函数MyCallBack，传入回调值i
                objMyCal.BeginInvoke(10 * i,1000*1, MyCallBack, i);
            }
        }

        private void MyCallBack(IAsyncResult result)
        {
            //返回结果
            int res = objMyCal.EndInvoke(result);
            Console.WriteLine("第{0}个计算结果为{1}",result.AsyncState.ToString(),res);
        }

       
    }
}