Collection properties should be read only

Question

I am using FxCop for my WPF MVVM assembly and it gives me the error

Collection properties should be read only

But in my propert

Answer 1

If you make your collection an ObservableCollection then the "important" events will be when items are added and removed from the collection, not when the collection is instatiated. I agree, with FxCop. Make the collection readonly, but make it an ObservableCollection