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Inheritance and Generics in Interfaces

Inheritance and Generics in Interfaces

Learn about generic interfaces and inheritance between interfaces.

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Inheritance in interfaces

Classes implement interfaces, but interfaces can derive from other interfaces. Everything we learned about inheritance is applicable to interfaces, except that iInterfaces can’t be marked as sealed.

There’s no way to prevent interfaces from inheriting from other interfaces. Also, when we implement an interface, we must implement all members that the interface inherited from its base interfaces:

Let’s see it in code:

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Program.cs
MultimediaFile.cs
IShareable.cs
IDownloadable.cs
using System;



namespace Interfaces

{

    // Must implement all members that are declared

    // across the chain of inheritance

    public class MultimediaFile : IShareable

    {

        // Method declared in IDownloadable

        public void Download()

        {

            Console.WriteLine("Downloading...");

        }



        public void ShareViaBluetooth()

        {

            Console.WriteLine("Sharing via bluetooth...");

        }



        public void ShareViaCloud()

        {

            Console.WriteLine("Sharing via cloud...");

        }



        public void ShareViaMail()

        {

            Console.WriteLine("Sharing via mail...");

        }

    }

}

In the code above, ...