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How does C# implement the concept of interfaces and why are they used?

Gautam Ramesh14002-Jul-2023

How does C# implement the concept of interfaces and why are they used?

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Updated on 04-Jul-2023
Gautam Ramesh

Gautam Ramesh

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I am Gautam Ramesh from Uttar Pradesh. Have completed my B. Tech. course from MNNIT campus Prayagraj in 2022. I have good knowledge of computer networking.

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2 Answers

Aryan Kumar

Aryan Kumar

04-Jul-2023

In C#, an interface is a contract that defines a set of methods that a class must implement. Interfaces are used to achieve a number of goals, including:

  • Abstraction: Interfaces can be used to abstract away the implementation details of a class. This can make code more readable and maintainable.
  • Polymorphism: Interfaces can be used to achieve polymorphism. Polymorphism allows you to treat objects of different types in the same way. For example, you can create a collection of objects that all implement the same interface, and then iterate through the collection using a generic loop.
  • Loose coupling: Interfaces can be used to achieve loose coupling. Loose coupling means that two classes are not tightly coupled together. This can make code more flexible and reusable.

C# implements the concept of interfaces using the interface keyword. An interface definition looks like this:

C#

interface IAnimal
{
    void Speak();
    void Move();
}

The IAnimal interface defines two methods: Speak() and Move(). Any class that implements the IAnimal interface must provide implementations for both of these methods.

To implement an interface, a class uses the implements keyword. For example:

C#

class Dog : IAnimal
{
    public void Speak()
    {
        Console.WriteLine("Woof!");
    }

    public void Move()
    {
        Console.WriteLine("Run!");
    }
}

The Dog class implements the IAnimal interface by providing implementations for the Speak() and Move() methods.

Once a class has implemented an interface, it can be used in any context that requires an object that implements the interface. For example:

C#

List<IAnimal> animals = new List<IAnimal>();
animals.Add(new Dog());
animals.Add(new Cat());

foreach (IAnimal animal in animals)
{
    animal.Speak();
}

The animals list can contain objects of any type that implements the IAnimal interface. In this example, the list contains objects of type Dog and Cat. The foreach loop iterates through the list and calls the Speak() method on each object.

Interfaces are a powerful tool that can be used to achieve a number of goals in C#. They can be used to abstract away implementation details, achieve polymorphism, and achieve loose coupling.

Gulshan Negi

Gulshan Negi

03-Jul-2023

Hello this is Gulshan Negi

Well, in C#, an interface is a language construct that defines a contract for classes to follow. It specifies a set of methods, properties, events, or indexers that a class implementing the interface must provide. The class that executes a connection point consents to stick to the point of interaction's agreement by carrying out every one of the individuals characterized in the connection point.

This is how defining interface in C

public interface IShape
{
   void Draw();
   double CalculateArea();
}
 

Thanks 

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