DelegateAndAsync

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace DelegateAndAsync
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class frmMain : System.Windows.Forms.Form
 {

  public delegate DateTime WorkHandler(int sleepMillisecond);

  private System.Windows.Forms.Button CmdStart;
  private System.Windows.Forms.RichTextBox RT001;
  private System.Windows.Forms.ProgressBar PB001;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public frmMain()
  {
   //
   // 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.CmdStart = new System.Windows.Forms.Button();
   this.RT001 = new System.Windows.Forms.RichTextBox();
   this.PB001 = new System.Windows.Forms.ProgressBar();
   this.SuspendLayout();
   //
   // CmdStart
   //
   this.CmdStart.Location = new System.Drawing.Point(104, 232);
   this.CmdStart.Name = "CmdStart";
   this.CmdStart.TabIndex = 0;
   this.CmdStart.Text = "Start";
   this.CmdStart.Click += new System.EventHandler(this.CmdStart_Click);
   //
   // RT001
   //
   this.RT001.Location = new System.Drawing.Point(8, 8);
   this.RT001.Name = "RT001";
   this.RT001.Size = new System.Drawing.Size(272, 96);
   this.RT001.TabIndex = 1;
   this.RT001.Text = "";
   //
   // PB001
   //
   this.PB001.Location = new System.Drawing.Point(8, 152);
   this.PB001.Name = "PB001";
   this.PB001.Size = new System.Drawing.Size(272, 23);
   this.PB001.TabIndex = 2;
   //
   // frmMain
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(292, 273);
   this.Controls.Add(this.PB001);
   this.Controls.Add(this.RT001);
   this.Controls.Add(this.CmdStart);
   this.Name = "frmMain";
   this.Text = "Test";
   this.ResumeLayout(false);

  }
  #endregion

  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new frmMain());
  }

  private void CmdStart_Click(object sender, System.EventArgs e)
  {
   MessageBox.Show("Start");
   WorkHandler wHandle = new WorkHandler(this.StartWork);
   wHandle.BeginInvoke(10000,new AsyncCallback(this.CompleteWork),wHandle);
   
  }

  /// <summary>
  ///
  /// </summary>
  /// <param name="sleepMillisecond"></param>
  /// <returns></returns>
  private DateTime StartWork(int sleepMillisecond)
  {
   this.CmdStart.Enabled = false;
   int val = 0;
   while(true)
   {
    val += 10/(sleepMillisecond/1000);
    System.Threading.Thread.Sleep(1000/(sleepMillisecond/1000));
    this.PB001.Value = val;
    if(val == 100 || val > 100 )
     break;

   }
   return DateTime.Now;
  
  }

  /// <summary>
  /// 当StartWork完成后该做的任务
  /// </summary>
  /// <param name="ar"></param>
  private void CompleteWork(IAsyncResult ar)
  {
   try
   {
    WorkHandler WH=(WorkHandler)ar.AsyncState;
    DateTime dt = WH.EndInvoke(ar);   
    MessageBox.Show(this,dt.ToString());
    this.CmdStart.Enabled = true;
   }
   catch(Exception e)
   {
    Console.Write(e);
   }
  }

  private void CompleteWork()
  {
   
  }

 }
}