当前位置 博文首页 > zcy_wxy的博客：C# 捕获关机事件方法
方法一：
private const int WM_QUERYENDSESSION = 0x0011;
/// <summary>
/// 窗口过程的回调函数
/// </summary>
///<param name="m">
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
//此消息在OnFormClosing之前
case WindowsMessage.WM_QUERYENDSESSION:
//MessageBox.Show(WndProc.WM_QUERYENDSESSION.我要阻止系统关闭！);
//this.Close();
//this.Dispose();
//Application.Exit();
m.Result = (IntPtr)1; //阻止Windows注销、关机或重启
break;
default:
break;
}
base.WndProc(ref m);
} 方法二：
protected override void OnFormClosing(FormClosingEventArgs e)
{
switch (e.CloseReason)
{
case CloseReason.ApplicationExitCall:
e.Cancel = true;
MessageBox.Show(拦截关闭要求事件！);
break;
case CloseReason.FormOwnerClosing:
e.Cancel = true;
MessageBox.Show(拦截自身关闭事件！);
break;
case CloseReason.MdiFormClosing:
e.Cancel = true;
MessageBox.Show(拦截MDI窗体关闭事件！);
break;
case CloseReason.None:
break;
case CloseReason.TaskManagerClosing:
e.Cancel = true;
MessageBox.Show(拦截任务管理器关闭事件！);
break;
case CloseReason.UserClosing:
//注销或关机会触发此事件；
//MessageBox.Show(拦截用户关闭事件！);
e.Cancel = false;
break;
case CloseReason.WindowsShutDown:
e.Cancel = true;
MessageBox.Show(拦截关机事件！);
break;
default:
break;
}
base.OnFormClosing(e);
} 方法三：
//当用户试图注销或关闭系统时发生。
SystemEvents.SessionEnding += new SessionEndingEventHandler(SystemEvents_SessionEnding);
//下面是系统注销或关闭事件处理程序，
private void SystemEvents_SessionEnding(object sender, SessionEndingEventArgs e)
{
if (MessageBox.Show(this, 是否允许系统注销！, 系统提示, MessageBoxButtons.YesNo) != DialogResult.Yes)
{
e.Cancel = true;
}
else
{
e.Cancel = false;
}
SessionEndReasons reason = e.Reason;
switch (reason)
{
case SessionEndReasons.Logoff:
MessageBox.Show(用户正在注销。操作系统继续运行，但启动此应用程序的用户正在注销。);
break;
case SessionEndReasons.SystemShutdown:
MessageBox.Show(操作系统正在关闭。);
break;
}
}?
cs