WPF hide a window in Closing event prevents from application terminating

Question

A simple question again.

I am using a window in a WPF as a child window, where I would rather have the 'X' button hide the window instead of close. For that, I have:

private void Window_Closing(object sender, CancelEventArgs e) { this.Hide(); e.Cancel = true; }

The problem is that when the parent window is closed, this never closes and keeps the app alive.

Is there a clean way to deal with this? I thought of adding a Kill flag to all my user controls (windows):

public bool KillMe; private void Window_Loaded(object sender, RoutedEventArgs e){ KillMe = false; } private void Window_Closing(object sender, CancelEventArgs e) { this.Hide(); if (!KillMe) e.Cancel = true; }

Then in MainWindow_Closing() I would have to set all window KillMe flags to true.

Any better way than creating additional flags and forgetting to set them before closing?

Reed Copsey · Accepted Answer · 2011-01-19 17:27:30Z

You could call Shutdown in the "parent's" closing handler... This will cause your Cancel to be ignored.

From Window.Closing:

If Shutdown is called, the Closing event for each window is raised. However, if Closing is canceled, cancellation is ignored.

Sasha Reminnyi · Accepted Answer · 2011-01-19 17:35:29Z

I usualy have my own AppGeneral static class for such cases. When I'm realy exiting app I'm setting AppGeneral.IsClosing static bool to true. And then, when closing:

private void Window_Closing(object sender, CancelEventArgs e) { if (!AppGeneral.IsClosing) { this.Hide(); e.Cancel = true; } }

Also, you can kill the your own process (that's ugly but working :) ) Process.GetCurrentProcess().Kill();

MegaMilivoje · Accepted Answer · 2013-02-09 16:50:58Z

You should use

Application.Current.Shutdown();

inside your master window closing method.

This should override canceling of any subwindow!

user23719438 · Accepted Answer · 2024-03-21 20:45:41Z

0

I had similar problem and setting ONLY (no extra C# code) ShutdownMode="OnMainWindowClose" (Application element) in App.xaml did the trick.

answered Mar 21, 2024 at 20:45

user23719438

1

1 Comment

Forshank Over a year ago

A ShutdownMode of OnMainWindowClose causes WPF to implicitly call Shutdown when the MainWindow closes, even if other windows are currently open. ref:learn.microsoft.com/en-us/dotnet/api/…

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