C# | Inheritance in interfaces

Last Updated : 23 Aug, 2024

C# allows the user to inherit one interface into another interface. When a class implements the inherited interface then it must provide the implementation of all the members that are defined within the interface inheritance chain.
Important Points:

If a class implements an interface, then it is necessary to implement all the method that defined by that interface including the base interface methods. Otherwise, the compiler throws an error.
If both derived interface and base interface declares the same member then the base interface member name is hidden by the derived interface member name.

Syntax:

// declaring an interface
access_modifier interface interface_name 
{
   // Your code
}

// inheriting the interface
access_modifier interface interface_name : interface_name
{
    // Your code
}

Example 1:

CSharp

// C# program to illustrate the concept // of inheritance in interface using System;  // declaring an interface public interface A {          // method of interface     void mymethod1();     void mymethod2(); }  // The methods of interface A  // is inherited into interface B public interface B : A {          // method of interface B     void mymethod3(); }   // Below class is inheriting // only interface B // This class must  // implement both interfaces class Geeks : B {          // implementing the method     // of interface A     public void mymethod1()     {         Console.WriteLine("Implement method 1");     }          // Implement the method      // of interface A     public void mymethod2()     {         Console.WriteLine("Implement method 2");     }          // Implement the method     // of interface B     public void mymethod3()     {         Console.WriteLine("Implement method 3");     } }  // Driver Class class GFG {      // Main method     static void Main(String []args)     {                  // creating the object         // class of Geeks         Geeks obj = new Geeks();                  // calling the method          // using object 'obj'         obj.mymethod1();         obj.mymethod2();         obj.mymethod3();     } }

Output

Implement method 1 Implement method 2 Implement method 3

Example 2:

CSharp

// C# program to illustrate the concept // of inheritance in the interface using System;  // declaring an interface public interface Votes  {          // method of interface      void vote_no(int a); }  // The methods of interface Votes // is inherited into interface Details public interface Details : Votes  {          // method of interface Details     void detailsofauthor(string n, int p); }  // Below class is inheriting  // the interface Details // This class must implement  // the methods of both interface // i.e. Votes and Details class TechnicalScriptWriter : Details  {      // implementing the method      // of interface Votes     public void vote_no(int a)     {         Console.WriteLine("Total number of votes is: {0}", a);     }          // implementing the method      // of interface Details      public void detailsofauthor(string n, int p)     {         Console.WriteLine("Name of the author is: {0}", n);                  Console.WriteLine("Total number of published" +                                  " article is: {0}", p);     } }  // Driver Class class GFG {      // Main method     static void Main()     {          // Creating the objects of          // TechinalScriptWriter class         TechnicalScriptWriter obj = new TechnicalScriptWriter();                  // calling the methods by passing         // the required values         obj.vote_no(470045);         obj.detailsofauthor("Siya", 98);     } }

Output

Total number of votes is: 470045 Name of the author is: Siya Total number of published article is: 98

C# | Inheritance in interfaces

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C# | Inheritance in interfaces

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