Do adding properties to an interface prevent creating private/protected “set” in derived types?

Question

Edit: It turns out I missed something obvious, but I\'m going to leave the question open in case someone else makes the same obvious mistake. Thanks to

Answer 1

It's possible on interfaces, but not on abstract/virtual properties - you may have these two mixed up.

Answer 2

This is perfectly legal. You don't need the override keyword (in fact it wouldn't compile) but there's nothing stopping you from doing this:

interface IField
{
    bool IsValid { get; }
}

class Field : IField
{
    public bool IsValid { get; protected set; }
}