Question

I have an ObservableCollection of an object in C#. This object implements an interface. I would like to be able to convert the ObservableCollection of the object to an ObservableCollection of the interface without having to parse through the collection.

So for example:

I have an object “Guitar” which implements an interface called “IMusicalInstrument”. I bind an ObservableCollection of Guitar objects to MyListBox. I want the following line of code to be able to convert listbox itemsSource to an ObservableCollection.

    ObservableCollection<IMusicalInstrument> InstrumentList = 
(ObservableCollection<IMusicalInstrument>)MyListBox.ItemsSource;

Currently, that is giving me an InvalidCastException.

Is there a way to accomplish this (without having to parse through the collection)?

Thanks,
Seth

Answer 1

Unless MyListBox.ItemsSource is an instance of ObservableCollection<IMusicalInstrument>, then no, you cannot cast it.