在C# winform编程中实现自动关闭MessageBox对话框，需要配合一个定时器，下面代码是一个timer4定时器的例子。原理是：在打开对话框前，先执行一个函数，该函数的作用时在对话框打开3秒后自动关闭对话框。下面代码直接复制粘贴到主程序区即可。
[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;
//此处定义要打开的对话框的内容*****************
private void button1_Click(object sender, EventArgs e)
{
StartKiller(); //开启定时关闭对话框功能
MessageBox.Show("3秒钟后自动关闭MessageBox窗口", "MessageBox");
}
private void StartKiller()
{
timer4.Interval = 3000; //3秒启动
timer4.Tick += new EventHandler(Timer_Tick);
timer4.Start();
}
private void Timer_Tick(object sender, EventArgs e)
{
KillMessageBox();
timer4.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);
}
}
