How can I make a read-only ObservableCollection property?

Question

I\'d like to expose a property on a view model that contains a list of objects (from database).

I need this collection to be read-only. That is, I want to prevent A

Answer 1

Use ReadOnlyObservableCollection< T >

public ReadOnlyObservableCollection ReadOnlyFoo
{
    get { return new ReadOnlyObservableCollection (_CollectionOfFoo); }
}

As has been pointed out, please use Eric J's answer as this one mistakenly is returning a new instance every time.