C#-interface

1. Interface members cannot have access modifiers, which are public by default.

2. An interface member can only give a signature and cannot have a specific implementation.

3. Classes that inherit an interface must all implement interface members.

4. The interface is multi-inherited.

5. In the process of implementing inheritance, the base class must be placed at the front of all interfaces.

6. An interface cannot instantiate an object.

7. An interface is a reference type.

C#-interface