Getting index of an item in an ObservableCollection inside the item

Question

I\'d like to be able to display an index value from within a DataTemplate, but I don\'t want the data to be persisted or backed by the model or viewmodel. In other

Answer 1

I would use a converter to do this.

The trick is giving it the source collection, either on the ConverterParameter or a Dependency Property. At that point, conversion is as simple as using IndexOf.

Here's a sample converter that does this:

public class ItemToIndexConverter : IValueConverter
{
    public object Convert(...)
    {
        CollectionViewSource itemSource = parameter as CollectionViewSource;
        IEnumerable