Question

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Why can't I have protected interface members?

as title, in C#. Is there no possibility that someone might want to have a protected or an internal interface?

Answer 1

Because Interface is in crude terms ‘a view to the outside world’ and since it is for the outside world, there is no point making its members protected or private.

Or in other words, it is a contract with the outside world which specifies that class implementing this interface does a certain set of things. So, hiding some part of it doesn’t make sense.

However, interfaces themselves can have access specifiers like protected or internal etc. Thus limiting ‘the outside world’ to a subset of ‘the whole outside world’.