How do you shutdown a WPF app when the "X" button is clicked

Question

I'm new to WPF and have noticed that my application keeps running after I click the "X" button to exit the window. I've programmed GUI's before, so I know that this is common. However, when I look into the issue, whatever solutions I find do not seem to make any sense.

I've found this Applicaton.ShutdownMode solution, but it seems like I am not implementing it correctly. I want my application to shutdown "OnMainWindowClose". This is a question that is pretty much the same as mine that I don't think was explained clearly enough in the accepted answer.

Following the Application.ShutdownMode solution, I have this in my MainWindow.xaml file:

<Window x:Class="CartToolsPrototype1.Window1" Background="White" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" ResizeMode="CanMinimize" Title="{DynamicResource CartTools}" Height="802" Width="950" WindowStartupLocation="CenterScreen" > <Window.Resources> <Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="Window1.xaml" ShutdownMode="OnMainWindowClose" > </Application>

The compiler gives me an error that says, "All objects added to an IDictionary must have a Key attribute or some other type of key associated with them." What exactly am I doing wrong here, and how can I correctly implement my shutdown function?

Thank you.

This most likely isn't a WPF specific problem. My guess would be that you start a thread and it is neither marked as background nor finished when you try to close your application. — Daniel Hilgarth
– Daniel Hilgarth, Commented Jul 15, 2013 at 13:38
Can't I just remove the wpf tag instead of starting a totally new thread? — Eric after dark
– Eric after dark, Commented Jul 15, 2013 at 13:58
Are you sure the problem isn't that my ShutdownMode isn't coded correctly? In my App.xaml file I have ShutdownMode="OneMainWindowClose", but the program continues in the background when I click "x" — Eric after dark
– Eric after dark, Commented Jul 15, 2013 at 14:06

dkozl · Accepted Answer · 2013-07-15 13:51:58Z

2

You don't put Application tag into your Window. In your solution you have app.xaml where you should put your:

ShutdownMode="OnMainWindowClose"

and quoting MSDN:

MainWindow is automatically set with a reference to the first Window object to be instantiated in the AppDomain.

edited Jul 15, 2013 at 13:51

answered Jul 15, 2013 at 13:38

dkozl

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5 Comments

Eric after dark Over a year ago

OOOOH, okay. Lightbulb... I put it in that file, but my Window1 must not be set as the "main window" because the x button doesn't close out the application when I close the main window.

dkozl Over a year ago

What is your StartupUri in app.xaml. Is it your MainWindow?

Eric after dark Over a year ago

StartupUri is "Window1.xaml"

dkozl Over a year ago

My solution just tells you how to change ShutdownMode and deal with compile error you're having but, as @GarryVass suggested, your app should close with default settings any way and I would suggest to do some more debugging to see if there's anything blocking shutdown.

Eric after dark Over a year ago

I marked this as my answer, because technically it did solve my compiler error, but I did find an error during debugging that was preventing shutdown.

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