About Interface

Question

1) Can we create instance of Interface like class ?

Amit Kumar · Answer

Hi Yes we can create an instance of Interface but using derived class. public interface IAnimal { string Speak(); } public class Dog : IAnimal { public string Speak() { return Woof woof; } } class Program { static void Main(string[] args) { IAnimal animal = new Dog(); Console.WriteLine(animal.Speak()); } }

Jasbeer Singh · Answer

Hi Murari You cannot instantiate interface.You can create instance of a class that implements the interface. e.g interface I1 { void Func1(); } class C1: I1 { public Func1() { //one implementation } } class C2 : I1 { public Func1() { //the other implementation } } I1 tmp = new C1: (); tmp = new C2(); Mark this as answer if it solves your problem.

Subash · Answer

Interface is mainly used for the to acheive the inheritance concept in C#. in the interface you can't implementation in the derived class only you implement the interface method (note:the signature should be same)