多线程讲解

 http://apps.hi.baidu.com/share/detail/5571960

using System;
using System.Threading;
using System.Windows.Forms;

namespace ThreadTest
{
    public partial class Form1 : Form
    {
        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";
            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 set_lableText(string s) //主线程调用的函数
        {
            label1.Text = s;
        }

        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 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
            }
        }
    }
}