Application Exit not called on windows restart

• .NET Core Version: 6.0
• Windows version: 19044.2130
• Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes
• Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc…)? No

Problem description: When a WPF application is running and the I restart Windows. The Application Exit method defined in App.xaml is not called. Additionally when I override the OnExit method it is also not called.

I have (I think) turned off Fast Startup and the issue still occurs.

Actual behavior: OnExit override and Application Exit method are not called when restarting Windows with application running and visible.

Expected behavior: OnExit override and Application Exit methods are invoked when Windows is restarted.

Minimal repro:

App.xaml

 <Application x:Class="ShutdownTest.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:ShutdownTest"
             StartupUri="MainWindow.xaml"
             Exit="Application_Exit"
             SessionEnding="Application_SessionEnding"
             ShutdownMode="OnMainWindowClose">
    <Application.Resources>
         
    </Application.Resources>
</Application>

App.xaml.cs

    public partial class App : Application
    {
        protected override void OnExit(ExitEventArgs e)
        {
            using(var sw = new StreamWriter(@"c:\logs\test.txt"))
            {
                sw.WriteLine($"{nameof(OnExit)} - called");
            }
            base.OnExit(e);
        }

        private void Application_Exit(object sender, ExitEventArgs e)
        {
            using (var sw = new StreamWriter(@"c:\logs\test2.txt"))
            {
                sw.WriteLine($"{nameof(Application_Exit)} - called");
            }
        }

        private void Application_SessionEnding(object sender, SessionEndingCancelEventArgs e)
        {
            using (var sw = new StreamWriter(@"c:\logs\test3.txt"))
            {
                sw.WriteLine($"{nameof(Application_SessionEnding)} - called");
            }
        }
    }

[Daniellled]

Interestingly enough if I modify the App.xaml code to not call SessionEnding=“Application_SessionEnding” zero files are created.

<Application x:Class="ShutdownTest.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:ShutdownTest"
             StartupUri="MainWindow.xaml"
             Exit="Application_Exit"
             
             ShutdownMode="OnMainWindowClose">
    <Application.Resources>
         
    </Application.Resources>
</Application>

It is almost like the behavior is as follows.

If a SessionEnding method is defined the SessionEnding method is fully invoked. And the OnExit override is partially invoked but cut short by the OS. While the Exit=“Application_Exit” method defined in App.xaml is never invoked.

If a SessionEnding method is not defined. The OnExit override method is not called as well as the Exit=“Application_Exit” method defined in App.xaml.

[Daniellled]

If you have 64-bit preferred then yes. But I can reproduce it under debugger only anyway, and I suspect the debugger process is just shutting it down in panic. Sounds like I don’t really have repro then. Just to rule out the obvious - it’s a normal desktop app, correct? You don’t start as a console or service…

I just went into Microsoft Visual Studio Enterprise 2022 (64-bit) Version 17.0.1 and created a new WPF project and added the modifications posted in the issue.

So I would say it is a normal desktop app.