Why is ReadOnlyObservableCollection.CollectionChanged not public?

Question

Why is ReadOnlyObservableCollection.CollectionChanged protected and not public (as the corresponding ObservableCollection.CollectionChanged is)?

What is the use of a col

Answer 1

I know this post is old, however, people should take their time to understand the patterns used in .NET before commenting. A read only collection is a wrapper on an existing collection that prevents consumers from modifying it directly, look at ReadOnlyCollection and you will see that it is a wrapper on a IList which may or may not be mutable. Immutable collections are a different matter and are covered by the new immutable collections library

In other words, read only is not the same as immutable!!!!

That aside, ReadOnlyObservableCollection should implicitly implement INotifyCollectionChanged.