C#多线程代码

C# Thread Demo;

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 BackAndForThread
{
    /// <summary>
    /// Leo.wl
    /// 北京.昌平 2011.4.30
    /// </summary>
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            InitializeMyBackGroundWorkComponent();
        }
        /// <summary>
        /// 初始化后台工作者（BackgroundWorker）是执行异步操作
        /// </summary>
        private void InitializeMyBackGroundWorkComponent()
        {
            this.backgroundWorkerObj = new System.ComponentModel.BackgroundWorker();
            // backgroundWorkerObj
            this.backgroundWorkerObj.RunWorkerCompleted +=
                new System.ComponentModel.RunWorkerCompletedEventHandler(
                  this.backgroundWorkerObj_RunWorkerCompleted);
        }
       
         /// <summary>
         /// 代理实现异步调用以设置TextBox控件text属性
         /// </summary>
         /// <param name="text">string value</param>
        delegate void SetTextCallback(string text);
        /// <summary>
        /// 此线程用来演示线程安全和非安全两种方式来调用一个windows窗体控件
        /// </summary>
        private Thread demoThread = null;
        /// <summary>
        /// 此后台工作者（BackgroundWorker）用来演示执行异步操作的首选方式
        /// </summary>
        private BackgroundWorker backgroundWorkerObj;

        #region Thread Unsafe
        //此事件句柄创建一个ie线程以非安全方式调用一个windows窗体控件
        private void setTextUnsafeBtn_Click(object sender, EventArgs e)
        {
            this.demoThread = new Thread(new ThreadStart(this.ThreadProcUnsafe));
            this.demoThread.Start();
        }

        /// <summary>
        /// 此方法在工作者线程执行并且对TextBox控件作非安全调用
        /// </summary>
		private void ThreadProcUnsafe()
        {
            this.txtResult.Text += "This text was set unsafely.";
        }
        #endregion

        #region Thread Safe
        //此事件句柄创建一个以线程安全方式调用windows窗体控件的线程
        private void setTextSafeBtn_Click(object sender, EventArgs e)
        {
            this.demoThread = new Thread(new ThreadStart(this.ThreadProcSafe));
            this.demoThread.Start();
        }
        /// <summary>
        /// 此方法在工作者线程执行并且对TextBox控件作线程安全调用
        /// </summary>
        private void ThreadProcSafe()
        {
            this.SetText("This text was set safely.");
        }
        /// <summary>
        /// 此方法演示一个对windows窗体控件作线程安全调用的模式
        /// 如果调用线程和创建TextBox控件的线程不同，这个方法创建
        /// 代理SetTextCallback并且自己通过Invoke方法异步调用它
        /// 如果相同则直接设置Text属性
        /// </summary>
        /// <param name="text">值</param>
        private void SetText(string text)
        {
            // InvokeRequired需要比较调用线程ID和创建线程ID
            // 如果它们不相同则返回true
            if (this.txtResult.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
                this.Invoke(d, new object[] { text });
            }
            else
            {
                this.txtResult.Text += text;
            }
        }

        #endregion 
        
        #region BackgroundWorker是执行异步操作的首选方式
        // 此事件句柄通过调用RunWorkerAsync开启窗体的BackgroundWorker
        // 当BackgroundWorker引发RunworkerCompleted事件的时候TextBox
        // 控件的Text属性被设置
        private void setTextBackgroundWorkerBtn_Click(object sender, EventArgs e)
        {
            this.backgroundWorkerObj.RunWorkerAsync();
        }

        // 此事件句柄设置TextBox控件的Text属性，它在创建TextBox控件的线程
        // 中被调用，所以它的调用是线程安全的
        // BackgroundWorker是执行异步操作的首选方式
        private void backgroundWorkerObj_RunWorkerCompleted(
        object sender,
        RunWorkerCompletedEventArgs e)
        {
            this.txtResult.Text += "This text was set safely by BackgroundWorker.";
        }
        #endregion

    }
}