System.ArgumentNullException Occurs When Assigning Empty Class Object to ListView ItemSource on Windows Platform

[HarishKumarSF4517]

Description

The Windows app crashes with a System.ArgumentNullException when running the sample code that includes a CustomViewCell inside a ListView. The exception occurs when trying to interact with or render the CustomViewCell in the ListView, leading to an immediate crash.

Steps to Reproduce

1. Launch the app on a Windows device - Issue935.zip
2. Run the sample code with a CustomViewCell inside a ListView.
3. The app will crash with a System.ArgumentNullException during the rendering of the ListView or upon interaction with the CustomViewCell.

Expected Behavior:

The ListView should render and display the CustomViewCell without any exceptions, and the ItemTapped event should fire correctly when interacting with the cell. The app should not crash.

Actual Behavior:

The app crashes on Windows with a System.ArgumentNullException when the CustomViewCell is rendered or tapped. The exception is thrown during the interaction with the ListView, preventing the UI from being displayed as expected.

Link to public reproduction project repository

No response

Version with bug

9.0.40 SR4

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

No response

Affected platforms

Windows

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

[rmarinho]

Can we test if this was a regression, or if it worked on net8 ?

Thanks

[Ying-6]

Hi @HarishKumarSF4517 I haven't repro your issue on 9.0.40. When I use your repo to debug on Windows, only a gray background bar is displayed, and nothing happens when I click on the background bar. Could you confirm that your repro is stable? And could you help me confirm whether the App page deployed on Windows is consistent with mine? By the way, I changed MainPage = new Issue935(); in the App.xaml.cs file, because there seems to be an error in your previous code MainPage = new Issue417();

[jfversluis]

Please have a look at the comment above and double-check, thanks! :)

[HarishKumarSF4517]

Hi @HarishKumarSF4517 I haven't repro your issue on 9.0.40. When I use your repo to debug on Windows, only a gray background bar is displayed, and nothing happens when I click on the background bar. Could you confirm that your repro is stable? And could you help me confirm whether the App page deployed on Windows is consistent with mine? By the way, I changed MainPage = new Issue935(); in the App.xaml.cs file, because there seems to be an error in your previous code MainPage = new Issue417();

Hi @Ying-6 ,
I updated the App.xaml.cs file and replaced it with a new zip file. When running the test in the Maui Host App (Issue ID: Issue935), an ArgumentNullException is thrown. However, in a simple sample, the UI renders without the label. The expected behavior is for the label to display the text "I have been Selected".

[Ying-6]

According to the user's comment, this issue has been verified Visual Studio 17.14 Preview 1(9.0.40 & 9.0.0). Can repro this issue on Windows platform. The UI renders without the label that display the text "I have been Selected" on simple sample.