C# 事件 委托 同步 异步

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Configuration;

using System.IO.Pipes;

using System.Threading;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

test += new Testdelegate(test1);//事件赋值

test+=new Testdelegate( test2);//事件赋值

}

string msg = "";

string test1(DelegateEventArgs e)

{

for (int i = 1; i <= 100;i++ )

{

msg += i.ToString() + ",";

Thread.Sleep(100);

}

return "";

}

string test2(DelegateEventArgs e)

{

for (int i = 101; i <= 200;i++ )

{

msg += i.ToString() + ",";

Thread.Sleep(100);

}

return "";

}

//定义事件

private event Testdelegate test;

private void button2_Click(object sender, EventArgs e)

{

msg = "";

if (test!=null)

{

//异步执行事件里的委托链

foreach (Testdelegate t in test.GetInvocationList())

{

DelegateEventArgs a = new DelegateEventArgs("");

t.BeginInvoke(a, null, null);

}

 

//同步执行事件里的委托

//DelegateEventArgs b = new DelegateEventArgs("");

//test(b);

}

}

private void button3_Click(object sender, EventArgs e)

{

MessageBox.Show(msg);

}

}

//定义委托参数 

public class DelegateEventArgs : EventArgs

{

string str_response;

public DelegateEventArgs(string ls_res)

{

this.str_response = ls_res;

}

}

//定义委托规格 

public delegate string Testdelegate(DelegateEventArgs e);

}