[BUG] CameraView StopCameraPreviewCommand is not working

[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

The CameraView.StopCameraPreviewCommand is not working correctly. When binding this command to a button, the app raises the following exception:

System.InvalidCastException: 'Unable to cast object of type 'Microsoft.Maui.Controls.Command' to type 'Microsoft.Maui.Controls.Command`1[System.Threading.CancellationToken]'.'

Expected Behavior

The StopCameraPreviewCommand should work as expected.

Steps To Reproduce

1. Run the CommunityToolkit.Maui.Sample app with the latest main branch on Windows (Note: might have to revert the commit 9aca2fc due to the issue [BUG] CommunityToolkit sample app crashes opening CameraView page on Windows #3155)
2. Open the CameraView Page from the Views side menu
3. Observe that the above exception is thrown
4. Continue running the app. Observe that the "Stop Camera Preview" button does not work as expected.

Link to public reproduction project repository

https://github.com/CommunityToolkit/Maui/tree/main/samples

Environment

- .NET MAUI CommunityToolkit: v14.0.1
- .NET MAUI CommunityToolkit.Maui.Camera: v6.0.0
- OS: Windows 11 Enterprise
- .NET MAUI: 10.0.41

Anything else?

No response

[ne0rrmatrix]

@zhitaop please test #3157 and report back if that fixes your issue.

[zhitaop]

@ne0rrmatrix I've tested your branch locally. Opening the CameraView page does not throw the InvalidCastException anymore. However, the "Stop Camera Preview" button still does not work as expected.

I've opened a PR #3158 which I believe should fix this issue properly. I've tested locally and the command is working as expected. Would you be able to take a look?