[risolto] CollectionView.IndexOf .NET MAUI

Question

I wanted to use CollectionView.IndexOf to retrieve the index of the specified item but indexof does not exist

if I add using System.Windows.Data;

var collectionView = (CollectionView)container;

gives me error converting Microsoft.Maui with System.Windows

this is what I would like to accomplish

protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
       {
            var collectionView = (System.Windows.Data.CollectionView)container;
            var index = collectionView.ItemsSource.IndexOf(item);
            return index%2 == 0 ? unoTemplate : dueTemplate;
        }

Answer 1

certainly, the error was in casting an object to a type not compatible with the object itself.

this is the instruction that fixed my problem
IList collection = (IList)collectionView.ItemsSource;

I put the complete code below

protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
        {
            var collectionView = (CollectionView)container;
            IList collection = (IList)collectionView.ItemsSource;
            var index = collection.IndexOf(item);
            return index%2==0 ? unoTemplate : dueTemplate;
        }