Binding CollectionView/CarouselView to lists of primitive types doesn't work on Release Builds

[stefanpirkl]

Description

A CollectionView/CarouselView bound to an IList with primitive types doesn't render items on release builds.

Tested on Windows and Android, both don't work.

Debug:

Release:

Steps to Reproduce

1. Create a new .NET MAUI project

2. Add a view model with a list property of type List and some elements:
   ` internal class MainPageViewModel : BindableObject
   {
   private IList _items = new List { "first value", "second value", "third value" };

    public IList<string> Items
    {
        get { return _items; }
        set { _items = value; OnPropertyChanged(nameof(Items)); }
    }
   

   }`

3. Bind the view model to MainPage.xaml.cs:
   ` public partial class MainPage : ContentPage
   {
   MainPageViewModel viewModel = new MainPageViewModel();

    public MainPage()
    {
        InitializeComponent();
   
        BindingContext = viewModel;
    }
   

   }`

4. Add a CollectionView to MainPage.xaml, bound to the list in MainPageViewModel:
   <CollectionView ItemsSource="{Binding Items}"> <CollectionView.ItemTemplate> <DataTemplate> <Label Text="{Binding}" /> </DataTemplate> </CollectionView.ItemTemplate> </CollectionView>

5. Do a release build, observe that nothing is rendered.

Link to public reproduction project repository

https://github.com/stefanpirkl/bugreport-maui-collectionview-primitive-list-on-release

Version with bug

8.0.0-preview.5.8529

Last version that worked well

Unknown/Other

Affected platforms

Android, Windows, I was not able test on other platforms

Affected platform versions

Windows 10, Android 9 and up

Did you find any workaround?

Changing the List to a custom model class with a single string property in it.

Relevant log output

No response

[XamlTest]

Verified this on Visual Studio Enterprise 17.7.0 Preview 6.0. Repro on Windows 11 and Android 13.0-API33 .NET 8 with below Project:
CollectionViewBinding.zip

[IsmailHassani]

I've encountered the same issue with Release build.
It has to do with the issue #20002 that states you have to specify the x:DataType to fix the binding.
For strings i use:
<DataTemplate x:DataType="x:String">

[stefanpirkl]

I've encountered the same issue with Release build. It has to do with the issue #20002 that states you have to specify the x:DataType to fix the binding. For strings i use: <DataTemplate x:DataType="x:String">

Wow, thank you! This did really fix it.