C#委托的初步接触

　　以下是全部的代码
　　本实例中有2个betton控件， 2个label控件，一个时钟控件
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.Threading;
namespace threadtest
{
public partial class Form1 : Form
{
int i;
private Thread thread1;//定义线程
delegate void set_Text(string s);//定义委托
set_Text Set_Text; //定义委托
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender， EventArgs e)
{
label1.Text = "0";
label2.Text = "0";
Set_Text = new set_Text(set_lableText); //实例化
}
private void button1_Click(object sender， EventArgs e)
{
thread1 = new Thread(new ThreadStart(run));
thread1.Start();
}
private void run()
{
for (int i = 0; i < 101; i++)
{
label1.Invoke(Set_Text， new object[] { i.ToString() }); //通过调用委托，来改变lable1的值
Thread.Sleep(1000); //线程休眠时间，单位是ms
}
}
private void set_lableText(string s)
{
label1.Text = s;
}
private void timer1_Tick(object sender， EventArgs e)
{
i++;
if (i > 100)
{
timer1.Stop();
}
label2.Text = i.ToString();
}
private void Form1_FormClosing(object sender， FormClosingEventArgs e)
{
if (thread1.IsAlive) //判断thread1是否存在，不能撤消一个不存在的线程，否则会引发异常
{
thread1.Abort(); //撤消thread1
}
}
private void button2_Click(object sender， EventArgs e)
{
timer1.Start();
}
}
}