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   源码介绍

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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 ThreadUIDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            // 加入这行
            //Control.CheckForIllegalCrossThreadCalls = false;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Thread thread1 = new Thread(new ParameterizedThreadStart(UpdateLabel));
            thread1.Start("更新Label");
        }

        private void UpdateLabel(object str)
        {
            this.label1.Text = str.ToString();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Thread thread2 = new Thread(new ParameterizedThreadStart(UpdateLabel2));
            thread2.Start("更新Label");
        }

        private void UpdateLabel2(object str)
        {
            Thread.Sleep(3000);
            if (label2.InvokeRequired)
            {
                // 当一个控件的InvokeRequired属性值为真时，说明有一个创建它以外的线程想访问它
                Action<string> actionDelegate = (x) => {

                    this.label2.Text = x.ToString();                
                };
                // 或者
                // Action<string> actionDelegate = delegate(string txt) { this.label2.Text = txt; };
                this.label2.Invoke(actionDelegate, str);
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            using (BackgroundWorker bw = new BackgroundWorker())
            {
                bw.RunWorkerCompleted = new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
                bw.DoWork = new DoWorkEventHandler(bw_DoWork);
                bw.RunWorkerAsync("Tank");
            }         
        }

        void bw_DoWork(object sender, DoWorkEventArgs e)
        {       
            // 这里是后台线程， 是在另一个线程上完成的
            // 这里是真正做事的工作线程
            // 可以在这里做一些费时的，复杂的操作
            Thread.Sleep(5000);
            e.Result = e.Argument "工作线程完成";
        }

        void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            //这时后台线程已经完成，并返回了主线程，所以可以直接使用UI控件了
            this.label4.Text = e.Result.ToString();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            Thread thread3 = new Thread(new ParameterizedThreadStart(UpdateLabel3));
            thread3.Priority = ThreadPriority.BelowNormal;
            thread3.Start("更新Label");
        }

        private void UpdateLabel3(object str)
        {
            Thread.Sleep(3000);
            if (label3.InvokeRequired)
            {
                // 当一个控件的InvokeRequired属性值为真时，说明有一个创建它以外的线程想访问它
                Action<string> actionDelegate = (x) =>
                {
                    this.label3.Text = x.ToString();
                };
                // 或者
                // Action<string> actionDelegate = delegate(string txt) { this.label3.Text = txt; };
                this.label3.BeginInvoke(actionDelegate, str);
            }
        }
    }
}