WPF Handling Window taskbar closing event

Question

I have a problem in a WPF Application. When I close my application from the Window task bar (Close window) or press Alt + F4 it never hits the Application_exit event handler in my App.xaml file.

<Application x:Class="WPFApplication.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Startup="Application_Startup" Exit="Application_Exit">

Code behind

private void Application_Exit(object sender, ExitEventArgs e) { Application.Current.Shutdown(); }

Why not use this.Close()? It calls Application.Current.Shutdown(). Also, you may need a return statement after your Application.Current.Shutdown(), but I can't remember for sure if that's necessary. — alacy
– alacy, Commented May 8, 2015 at 12:05
@AmatuerDev No i am just using Startup in App.xaml file. and it back end Call LOGIN Form. — Khairullah Rehan
– Khairullah Rehan, Commented May 11, 2015 at 5:43

Cray · Accepted Answer · 2017-03-24 09:44:25Z

You have probably set

ShutdownMode="OnExplicitShutdown"

on your App.xaml (or in code behind).

Therefore you need to set a listener on the Closed event of your MainWindow, which is calling the shutdown method.

Or you have set

ShutdownMode="OnLastWindowClose"

Then you probably have some window open, besides the MainWindow.

Ivan Ling · Accepted Answer · 2015-05-08 07:52:26Z

Your event handler currently shuts down your app:

private void Application_Exit(object sender, ExitEventArgs e) { Application.Current.Shutdown(); }

But if you want to do something, your should add it before `Application.Current.Shutdown();' For example:

`private void Application_Exit(object sender, ExitEventArgs e) { //Do something here, delete unused files etc... Application.Current.Shutdown(); }

Thanks @Ivan Ling for comments. My problem is when i Pressed ALT + F4 keys any where in my Application it close that form but it does't hit This Application_Exit Function. How i possible it when i Pressed Alt+F4 or Close Window from Task Bar it shutdown my Application. Thanks

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