I have a collection view with an external view for the DataTemplate. The views show for the CollectionView with the data correctly bound (it’s not using a VM fas it’s simple app). The data model that fills the CollectionView contans a property called Id (an int). This is fed as the ClassId for the Frame within the ContentView used by the DataTemplate.

I’ve added a SelectionChanged event to the CollectionView which fires fine. However, when I examine the object passed in, it looks like the ClassId is not being propogagated to the ContentView selected.

My code in the event looks like this

void ItemSelected_Clicked(object? sender, SelectionChangedEventArgs e)
{
    var template = ((CollectionView)sender).ItemTemplate;

     var frame = (CollectionTemplateView)template.LoadTemplate();
     if (frame != null)
     {
         var theframe = frame.Content;
         if (theframe.BackgroundColor is null)
         {
             MainThread.BeginInvokeOnMainThread(() => theframe.BackgroundColor = Colors.Beige);
         }
     }
 }

If I set a break point on the inner if, the ClassId is null. If I set the ClassId in the ContentView to be some text, it shows fine (so it is the correct View).

ClassId is a bindable property, so I’m not sure if I’ve uncovered a bug here in MAUI.

Oddly, setting the background colour also has no effect on the Frame either. Am I missing something here?