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Visual Studio.NET IDE

Define C#.NET

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C#.Net Interface

Interfaces are declared in a same way as classes, but with the keyword interface. Interface can’t be instantiated as a class. Interface can’t contain any code that implements its member. A class can support multiple interface and multiple classes can support the same interface. If a class implements an interface it has to define all its members otherwise class has to be declared abstract.

Interface IMyInterface
	// interface members

The keyword abstract and sealed is not applicable with interface. Interface inheritance is also possible like class inheritance.

public interface IMyInterface :IMyBaseInterface, IMyBaseInterface2
	// interface members
interface circle
	float area(float r);
class example : circle
	public float area(float r)
		float a = 3.14f * r * r;
		return a;
class Program
	static void Main(string[] args)
		example ex = new example();
		circle cir=ex;
		float f = cir.area(5.0f);