[BUG] MediaElement throw ObjectDisposedException when wrapped in CollectionView

[WolfgangPhy]

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 MAUIELEMENT.Handler?.DisconnectHandler() throws an ObjectDisposedException when the MediaElement is wrapped in a ContentView inside a CollectionView.

This issue occurs only when the MediaElement is wrapped in a ContentView (e.g., the VideoPlayer in the reproduction repository). If the MediaElement itself is used as the ItemTemplate, the DisconnectHandler() works as expected.

Expected Behavior

The DisconnectHandler() not throw an exception.

Steps To Reproduce

1. Open the app in the reproduction project
2. Click on the CollectionView button
3. Click on the go back arrow in the NavigationBar

Link to public reproduction project repository

https://github.com/WolfgangPhy/MediaElementInCollectionViewBug.git

Environment

- .NET MAUI CommunityToolkit: 9.1.1
- OS: Android (not tested on iOS yet)
- .NET MAUI: 8

Anything else?

I investigated the issue as thoroughly as I could to identify the root cause. By debugging the MediaElement source code, I found that the exception originates here: [SOURCE] (

Maui/src/CommunityToolkit.Maui.MediaElement/Views/MauiMediaElement.android.cs

Line 94 in 9741f1a

playerView.Dispose();

).

(My issue might be related to the ExoPlayer issue mentioned in the comments a few lines above.)

You can see a screenshot of the exception here: Source of the exception

Given that the error only occurs when the MediaElement is wrapped, I strongly suspect that CollectionView recycling is the cause of this issue.

[dotnet-policy-service]

Hi @WolfgangPhy! We have added the needs reproduction label to this issue, which indicates that we are unable to take further action until you provide a reproduction sample that we can use to reproduce + fix your bug. In accordance with the Reporting a bug section of our Contributing.md that you confirmed reading before you submitted this Issue, we ask that every Issue author provide a link to an open-source repository containing the reproduction sample app. This issue will be closed automatically in 5 days if we do not receive a reproduction sample from you. Please feel free to re-open this Issue once you have provided a reproduction sample.

[ne0rrmatrix]

The reproduction sample is not public or has been deleted. Please update the sample. Can you try latest version of media element and look at the changes for it?

[dotnet-policy-service]

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 3 days. It will be closed if no further activity occurs within 2 days of this comment. If it is closed, feel free to comment when you are able to provide the additional information and we will re-investigate.

[dotnet-policy-service]

We haven't received a reproduction sample from you. The issue is closed.