How to use Application.Exit Event in WPF?

Question

I need to delete some certain files, then user closes program in WPF. So I tried MDSN code from here http://msdn.microsoft.com/en-us/library/system.windows.application.exit.aspx this way:

this code located here App.xml.cs

public partial class App : Application
{
 void App_Exit(object sender, ExitEventArgs e)
    {
       MessageBox.Show("File deleted");
        var systemPath = System.Environment.GetFolderPath(
                                  Environment.SpecialFolder.CommonApplicationData);

                var _directoryName1 = Path.Combine(systemPath, "RadiolocationQ");
                var temp_file = Path.Combine(_directoryName1, "temp.ini");

                if (File.Exists(temp1_file))
                {
                    File.Delete(temp1_file);
                }

    }

}

// App.xaml
<Application x:Class="ModernUIApp1.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml"
             ShutdownMode="OnExplicitShutdown"
             Exit="App_Exit">
    <Application.Resources>

First of all it doesn't delete files, secondly this program stays in the process after I pushed exit button( this is really strange). This code don't give any errors. And finally it doesn't show MessageBox So anything wrong here?

I think he just can`t find this function.

If you put a break point in there, does it get hit? Also show us your logic of the Exit button. — Silvermind
– Silvermind, Commented Dec 3, 2013 at 11:21

Ofir · Accepted Answer · 2013-12-03 09:26:32Z

68

It's quite simple:

Add "Exit" property to the application tag

<Application x:Class="WpfApplication4.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml"
             Exit="Application_Exit">
</Application>

and handle it in the "code behind"

private void Application_Exit(object sender, ExitEventArgs e)
{
    // Perform tasks at application exit
}

The Exit event is fired when the application is shutting down or the Windows session is ending. It is fired after the SessionEnding event. You cannot cancel the Exit event.

answered Dec 3, 2013 at 9:26

Ofir

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4 Comments

Rocketq Over a year ago

Could you look my code one more time, I did exatly like you said, but I get other problems

Ofir Over a year ago

I tied it and it's working fine. what is your issue? give me more details. try to remove the property ShutdownMode="OnExplicitShutdown" and let me know if it works

Rocketq Over a year ago

I have removed ShutdownMode="OnExplicitShutdown" and it started to work properly. Thank you a lot.

Orace Over a year ago

That not how you are supposed to do it. Just protected override void OnExit(ExitEventArgs e) in the code behind. Register to class own events is avoidable, avoid it.

BRAHIM Kamel · Accepted Answer · 2013-12-03 11:16:28Z

14

you should add app_exit in your xaml code

 <Application x:Class="CSharp.App"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  StartupUri="MainWindow.xaml" 
  ShutdownMode="OnExplicitShutdown"
  Exit="App_Exit"
    >
</Application>

you can just hook the event Closing on your main window like this -

 <Window Closing="Window_Closing">

And in your event do all the work you need

    private void Window_Closing(object sender, CancelEventArgs e)
{
     MessageBox.Show("File deleted");
    var systemPath = System.Environment.GetFolderPath(
                              Environment.SpecialFolder.CommonApplicationData);

            var _directoryName1 = Path.Combine(systemPath, "RadiolocationQ");
            var temp_file = Path.Combine(_directoryName1, "temp.ini");

            if (File.Exists(temp1_file))
            {
                File.Delete(temp1_file);
            }
}

edited Dec 3, 2013 at 11:16

answered Dec 3, 2013 at 9:03

BRAHIM Kamel

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1 Comment

Rocketq Over a year ago

Yes I forget to add app_exit event, but here new problem appeared. I updated question

PeymanR34 · Accepted Answer · 2019-11-11 18:29:49Z

7

If you don't like adding Exit event to XAML, you could try this alternative.

Add following method to your App.xaml.cs:

protected override void OnExit(ExitEventArgs e)
{
    base.OnExit(e);
    // Your code here
}

answered Nov 11, 2019 at 18:29

PeymanR34

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1 Comment

Ronnie Overby Over a year ago

Beware that base.OnExit(e); is what invokes the exit event.

Jouan Antoine · Accepted Answer · 2019-02-15 09:05:55Z

5

If you want to follow MVVM principle you can use System.Windows.Interactivity.WPF.

MainWindow.xaml

<Window x:Class="Endonext.View.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006">

<i:Interaction.Triggers>
    <i:EventTrigger EventName="Closing">
        <i:InvokeCommandAction Command="{Binding WindowClosingCommand, Mode=OneTime}" />
    </i:EventTrigger>
</i:Interaction.Triggers>

MainWindowViewModel.cs

public class MainWindowViewModel 
{
    ICommand WindowClosingCommand => new RelayCommand(arg => this.WindowClosing());

    private void WindowClosing()
    {
      // do what you want.
    }
}

This approach is more testable. Have a nice day.

answered Feb 15, 2019 at 9:05

Jouan Antoine

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2 Comments

dmedine Over a year ago

Please note: stackoverflow.com/questions/46556240/…

dmedine Over a year ago

You also need to implement RelayCommand in order for this solution to work.

icernos · Accepted Answer · 2017-09-19 16:39:19Z

0

Make sure that the namespace (MyApp) matches "x:Class=MyApp..."
Under properties for <Application></Application>, double click on the textbox next to 'Exit'.
If you get "Unable to add event handler" then Rebuilding the project fixed it for me.

XAML

<Application x:Class="MyApp.App"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         StartupUri="MainWindow.xaml"
         Exit="Application_Exit"
>

Code behind

using System.Windows;

namespace MyApp
{ 
   public partial class App : Application
   {
     private void Application_Exit(object sender, ExitEventArgs e)
     {
         //your code
     }
  }
}

answered Sep 19, 2017 at 16:39

icernos

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