C# interface

In C#, an interface is a type that defines a set of abstract methods and properties that a class can implement. An interface can be used to define a contract between a class and the rest of the program. It specifies the methods and properties that the class must implement, but it does not provide any implementation details.

To define an interface, you use the interface keyword followed by the name of the interface. Here's an example:

public interface IMyInterface
{
    void MyMethod1();
    void MyMethod2();
}

In this example, the IMyInterface interface defines two methods that any class implementing the interface must implement.

To implement an interface in a class, you use the :symbol followed by the name of the interface. Here's an example:

public class MyClass : IMyInterface
{
    public void MyMethod1()
    {
        // implementation of MyMethod1
    }

    public void MyMethod2()
    {
        // implementation of MyMethod2
    }
}

In this example, the MyClass class implements the IMyInterface interface by providing implementations for the MyMethod1 and MyMethod2 methods.

Interfaces are useful for defining a common set of methods and properties that multiple classes can implement. This allows for polymorphism and can help to make the code more flexible and maintainable. Interfaces can also be used to enforce certain behaviors and ensure that classes adhere to a certain standard or contract.