Why can't I have protected interface members?

Question

What is the argument against declaring protected-access members on interfaces? This, for example, is invalid:

public interface IOrange
{
    public OrangePee         


        

Answer 1

Interface members are a public API; things like protected etc are implementation details - and interfaces don't have any implementation. I suspect what you are looking for is explicit interface implementation:

public class NavelOrange : IOrange
{
    public OrangePeel Peel { get { return new OrangePeel(); } }
    OrangePips IOrange.Seeds { get { return null; } }
}