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C# - Multiple-Inheritance Using Interface Implementation

In this example, we will learn how to implement multiple-inheritance using the interface using C# program?
Submitted by Nidhi, on October 14, 2020 [Last updated : March 21, 2023]

Here, we will implement multiple-inheritance using interfaces, as we know that we cannot implement multiple-inheritance directly in C#.

C# program to implement multiple-inheritance using the interface

The source code to implement multiple-inheritance using interfaces is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

//C# program to implement multiple-inheritance 
//using the interface

using System;

interface MyInf1
{
    //Method Declaration
    void Method1();
}

//Parent class 1
class Sample1 : MyInf1
{
    public void Method1()
    {
        Console.WriteLine("Method1() called");
    }
}

interface MyInf2
{
    //Method Declaration
    void Method2();
}

//Parent class 2
class Sample2 : MyInf2
{
    public void Method2()
    {
        Console.WriteLine("Method2() called");
    }
}

class Sample3 : MyInf1,MyInf2
{
    Sample1 S1 = new Sample1();
    Sample2 S2 = new Sample2();

    public void Method1()
    {
        S1.Method1();
    }

    public void Method2()
    {
        S2.Method2();
    }
}

class Program
{
    public static void Main(String[] args)
    {
        Sample3 S = new Sample3();

        S.Method1();
        S.Method2();
    }
}

Output

Method1() called
Method2() called
Press any key to continue . . .

Explanation

Here, we created two interfaces MyInf1, MyInf2, and two-parent classes Sample1, Sample2. Here, we implemented both interfaces into Sample1 and Sample2 classes. After that, we created a child class Sample3, here we inherited the interfaces MyInf1, MyInf2.

In the Sample3 class we created the object of Sample1 and Sample2 class and here we defined two more methods Method1(), Method2(), and called Method1 of Sample1 class inside Method1() method of Sample3, and called Method2 of Sample2 class inside Method2() method of Sample3.

Now look the Program class that contains the Main() method. The Main() method is the entry point for the program. Here we created the object S of Sample3 class and called Method1() and Method2() that will print the corresponding message on the console screen.

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