What Are Interfaces in C

An interface contains definitions for a group of related functionalities that a non-abstract class or a struct must implement. An interface may define static methods, which must have an implementation. Beginning with C# 8.0, an interface may define a default implementation for members.

Why are interfaces public?

Interfaces are meant to define the public API of a type – and only that, not its implementation. So any method (or static member) you define in an interface is by definition public . Since an interface can’t contain any concrete implementation, there is no way to call any member methods from within.

Why interface is public in C#?

public : Interface members in C# are public by default, so this works. internal : If single interface members could be declared as internal , it would mean that a part of the interface could only be implemented by classes from the assembly that the interface resides in.