Why does List not implement IOrderedEnumerable?

Question

I would like to work with ordered enumerables, and use interfaces as return types rather than the concrete types. I need to return an ordered set of objects. Bu

Answer 1

Well, you are wrong: List is NOT ordered by a particular key. The elements inside the list are in the order you put them in. That's the reason, why List doesn't implement IOrderedEnumerable.
Just return the following:

ViewModel.SeriesRepository.OfType().OrderBy();