定时关闭messagebox

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace WindowsApplication1

{

 public partial class AutoDeleteMessageBox : Form

 {

  [DllImport("user32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]

  private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);

  [DllImport("user32.dll", CharSet = CharSet.Auto)]

  public static extern int PostMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

  public const int WM_CLOSE = 0x10;

  public AutoDeleteMessageBox()

  {

   InitializeComponent();

  }

  private void button1_Click(object sender, EventArgs e)

  {

   StartKiller();

   MessageBox.Show("3秒钟后自动关闭MessageBox窗口", "MessageBox");

  }

  private void StartKiller()

  {

   Timer timer = new Timer();

   timer.Interval = 3000; //3秒启动

   timer.Tick += new EventHandler(Timer_Tick);

   timer.Start();

  }

  private void Timer_Tick(object sender, EventArgs e)

  {

   KillMessageBox();

   //停止Timer

   ((Timer)sender).Stop();

  }

  private void KillMessageBox()

  {

   //按照MessageBox的标题，找到MessageBox的窗口

   IntPtr ptr = FindWindow(null, "MessageBox");

   if (ptr != IntPtr.Zero)

   {

    //找到则关闭MessageBox窗口

    PostMessage(ptr, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);

   }

  }

 }

}