Running app one day without touching it craching after move to other page

[danies8]

Description

Hi,
I have app that when i run it all day without touching it after login
and move to next page is carched.

Steps to Reproduce

1.Run the app.
2.Login
3Leavethe app running to one day and later move to another page.
4.App crached.
FlyoutExample (1).zip

Link to public reproduction project repository

...

Version with bug

8.0.3 GA

Is this a regression from previous behavior?

No, this is something new

Last version that worked well

7.0.101

Affected platforms

Windows

Affected platform versions

....

Did you find any workaround?

No

Relevant log output

Faulting application name: XXXXXXX, version: 1.0.0.0, time stamp: 0x65680000
Faulting module name: KERNELBASE.dll, version: 10.0.19041.1387, time stamp: 0x0b9a844a
Exception code: 0xc000027b
Fault offset: 0x000000000010b302
Faulting process id: 0x30c0
Faulting application start time: 0x01da802338803cbe
Faulting application path: XXXXXXXXXX
Faulting module path: C:\Windows\System32\KERNELBASE.dll
Report Id: 06ccce96-ab0d-447e-bace-eeb686ce73c8
Faulting package full name: 
Faulting package-relative application ID:

[danies8]

There is a timer running in main page , please look on OnAppearing+ OnDisappearing event.

[danies8]

Before you run the app published as exe
set maui as start project
right click on project name and open in terminal.
dotnet publish -f net8.0-windows10.0.19041.0 -c Release -p:WindowsPackageType=None -p:WindowsAppSDKSelfContained=true -p:RuntimeIdentifierOverride=win10-x64

[Zhanglirong-Winnie]

Verified this issue with Visual Studio 17.10.0 Preview 2(8.0.14). Can repro on windows platform with sample project.

[danies8]

Did you reproduced on windows platform.
What I need to do to fix it

[drasticactions]

protected override void OnAppearing()
    {
        base.OnAppearing();
   
        MainThread.BeginInvokeOnMainThread(() =>
        {
            serviceButton.TextColor = Color.FromRgb(0, 128, 0);
        });

        if (_timer == null)
        {
            var dispatcher = this.Dispatcher;

            _timer = dispatcher.CreateTimer();
            _timer.Interval = TimeSpan.FromSeconds(30);
            _timer.Tick += (s, e) =>
            {
                MainThread.BeginInvokeOnMainThread(() =>
                {
                    serviceButton.TextColor = Color.FromRgb(128, 0, 0);
                });

            };
            _timer.IsRepeating = true;

            _timer.Start();
        }


    }

    protected override void OnDisappearing()
    {
        base.OnDisappearing();
        if (_timer != null)
        {
            _timer.Stop();
        }
    }

If you remove this DispatchTimer, does it stop crashing?

[danies8]

@drasticactions
I will check.
I need timer , i did'nt created it well ? no possible to create timer with MAUI ?

[drasticactions]

It's trying to isolate if the issue is MAUI specific, or if having an ever-increasing DispatcherTimer is causing issues in Windows in general.

The code you're calling is from MAUI essentials, which implements Windows functions. If you ran the underlying code creating the Dispatcher Timer in a WinUI app and had the same crash after leaving it on, it would most likely be a WinUI/Windows issue.

If you remove the timer and it still crashes, then there testing would be more needed to isolate why it crashes for you.

[danies8]

Evrerything is OK.
You can close the ticket.
Thank you.

[danies8]

Thank you