using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data; namespace 异步委托和线程调用{ /// <summary> /// Form1 的摘要说明。 /// </summary> public class Form1 : System.Windows.Forms.Form {#region 默认代码  private System.Windows.Forms.Button button1;  private System.Windows.Forms.Button button2;  private System.Windows.Forms.ProgressBar progressBar1;  /// <summary>  /// 必需的设计器变量。  /// </summary>  private System.ComponentModel.Container components = null;   public Form1()  {   //   // Windows 窗体设计器支持所必需的   //   InitializeComponent();    //   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码   //  }   /// <summary>  /// 清理所有正在使用的资源。  /// </summary>  protected override void Dispose( bool disposing )  {   if( disposing )   {    if (components != null)     {     components.Dispose();    }   }   base.Dispose( disposing );  }   #region Windows 窗体设计器生成的代码  /// <summary>  /// 设计器支持所需的方法 - 不要使用代码编辑器修改  /// 此方法的内容。  /// </summary>  private void InitializeComponent()  {   this.button1 = new System.Windows.Forms.Button();   this.button2 = new System.Windows.Forms.Button();   this.progressBar1 = new System.Windows.Forms.ProgressBar();   this.SuspendLayout();   //    // button1   //    this.button1.Location = new System.Drawing.Point(147, 12);   this.button1.Name = "button1";   this.button1.Size = new System.Drawing.Size(116, 28);   this.button1.TabIndex = 0;   this.button1.Text = "使用线程=>";   this.button1.Click += new System.EventHandler(this.button1_Click);   //    // button2   //    this.button2.Location = new System.Drawing.Point(147, 44);   this.button2.Name = "button2";   this.button2.Size = new System.Drawing.Size(116, 28);   this.button2.TabIndex = 0;   this.button2.Text = "使用异步委托=>";   this.button2.Click += new System.EventHandler(this.button2_Click);   //    // progressBar1   //    this.progressBar1.Location = new System.Drawing.Point(0, 80);   this.progressBar1.Maximum = 1000;   this.progressBar1.Name = "progressBar1";   this.progressBar1.Size = new System.Drawing.Size(412, 12);   this.progressBar1.TabIndex = 1;   //    // Form1   //    this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);   this.ClientSize = new System.Drawing.Size(410, 94);   this.Controls.Add(this.progressBar1);   this.Controls.Add(this.button1);   this.Controls.Add(this.button2);   this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;   this.Name = "Form1";   this.Text = "Form1";   this.Closed += new System.EventHandler(this.Form1_Closed);   this.ResumeLayout(false);   }  #endregion   /// <summary>  /// 应用程序的主入口点。  /// </summary>  [STAThread]  static void Main()   {   Application.Run(new Form1());  }#endregion    //线程  private void button1_Click(object sender, System.EventArgs e)  {   System.Threading.Thread th = new System.Threading.Thread(    new System.Threading.ThreadStart(Fun2));      this.processEvent += new myProcessEventHandle(Form1_processEvent);   th.Start();   button2.Enabled = false;  }   //异步委托  private void button2_Click(object sender, System.EventArgs e)  {   System.Threading.WaitCallback wc = new System.Threading.WaitCallback(Fun);   object obj = this.button1;//这里没用。到时候你可以用来传递参数   this.processEvent += new myProcessEventHandle(Form1_processEvent);   System.Threading.ThreadPool.QueueUserWorkItem(wc,obj);      button1.Enabled = false;  }   public delegate void myProcessEventHandle(int percent);//定义事件  public event myProcessEventHandle processEvent = null;//事件声明      //线程无法带参数启动，和这个函数通讯直接用成员变量就可以了  private void Fun2()  {   int i = 0;   String str = this.Text;   while (i<1000)   {    i++;    //this.Text = i.ToString();    if (this.processEvent != null)    {     this.processEvent(i);    }    System.Threading.Thread.Sleep(8);   }      TelMe();   this.Text = str;  }   //异步委托可以也必须要一个参数，当然不想用就传一个null就可以了  private void Fun(object obj)  {   int i = 0;   String str = this.Text;   while (i<1000)   {    i++;    //this.Text = i.ToString();    if (this.processEvent != null)    {     this.processEvent(i);    }    System.Threading.Thread.Sleep(8);   }      TelMe();   this.Text = str;  }   //不是回调，但是同一个类里写的，就可以直接调用了。  private void TelMe()  {   this.processEvent -= new myProcessEventHandle(Form1_processEvent);   button1.Enabled = true;   button2.Enabled = true;   MessageBox.Show("操作完成！");  }   //事件方式通知主线程进度  private void Form1_processEvent(int percent)  {   this.progressBar1.Value = percent;   this.Text = ((double)percent/10).ToString() + "%";  }   private void Form1_Closed(object sender, System.EventArgs e)  {   System.Environment.Exit(0);//用于退出没有运行结束的线程  } }} //以上代码在vs2003可以运行。以前写的例子。

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