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.

Answer 1

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.