[BUG] CameraView crashes if exited too quickly on Windows

[zhitaop]

Is there an existing issue for this?

• I have searched the existing issues

Did you read the "Reporting a bug" section on Contributing file?

• I have read the "Reporting a bug" section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

Current Behavior

On Windows, if the app exits from the CameraView page while the view is still loading, the app crashes with an exception:

This can happen if user click the "back" button quickly enough to navigate away from the CameraView when the view is still loading

Expected Behavior

The app should not crash

Steps To Reproduce

1. Open and run project from the reproduction repo
2. Click the "Open and exit camera page" button. This button simulates opening the camera view page and navigate back by Navigation.PopAsync() after a certain time delay. Optionally set the time delay for camera page to exit, default is 50ms.
3. Observe the bug

Link to public reproduction project repository

https://github.com/zhitaop/MctCameraViewSample

Environment

- .NET MAUI CommunityToolkit.Maui.Camera: v6.0.0
- OS: Windows 11 Enterprise
- .NET MAUI: 10.0.41

Anything else?

No response

[pictos]

Instead of changing our code, why not wrap your code in a try/catch block? Didn't work?

[zhitaop]

@pictos Using a try/catch block in application code doesn't seem to work for me. I've tried adding a try/catch in my reproduction sample app: https://github.com/zhitaop/MctCameraViewSample/blob/323cf7acc956d61bd87fa2b7d2382ef3bbe5043c/MainPage.xaml.cs#L19-L33. The app still crashes with an exception.

Moreover, I think it's the library's responsibility to handle this issue as the bug is caused by a race inside CameraViewHandler lifecycle management. Consumers of the library should not need special exception handling for normal connect/disconnect navigation.