Question

I have a class that inherits from ObservableCollection<T> to re-use the INotifyCollection functionality, but acts like a HashSet. I’ve called it ObservableHashSet<T>. I use both ObservableCollection and ObservableHashSet in my app.

I’ve reached a point where I want to pass either an ObservableCollection or an ObservableHashSet into a method, but the only functionality I’m interested in is IEnumerable<T> and INotifyCollectionChanged.

My question is: is it possible to have a single method that takes as its parameter either of these classes? i.e.

ObservableCollection<IExample> a = new ...
ObservableHashSet<IExample> b = new ...
MyMethod(a);
MyMethod(b);

I’m using .NET 4, in case there are any juicy features in there that are useful…

Answer 1

If you’ve inherited from ObservableCollection then using that as the parameter type should work.