Best practice: How to expose a read-only ICollection

Question

I have an ICollection called foos in my class which I want to expose as read-only (see this question). I see that the interface defines a

Answer 1

You can make "foos" a ReadOnlyCollection like this:

ReadOnlyCollection readOnlyCollection = foos.ToList().AsReadOnly();

Then you can expose it as a property of your class.

EDIT:

    class FooContainer
    {
        private ICollection foos;
        public ReadOnlyCollection ReadOnlyFoos { get { return foos.ToList().AsReadOnly();} }

    }

Note: You should remember that once you get the ReadOnlyFoos collection is no longer "synchronized" with your foos ICollection. See the thread you referenced.