Question

In the .Net Framework, List<T> implements the ICollection<T> interface. However when looking at the List class in Visual Studio, I see no IsReadOnly property, which is supposedly in the ICollection<T> interface.

How is it possible for a class to implement an interface… but not really implement it?

Answer 1

It uses explicit interface implementation. For example:

public interface IFoo 
{
    void Bar();
}

public Foo : IFoo
{
    // Note the lack of public here
    void IFoo.Bar() {}
}