Introduction: What is interface in Dot Net ? How it is used in WCF Services?

An interface looks like a class, but it has no implementation. It contains:-

  1. Definitions of events, indexers, methods and properties.

  2. An interface inherited by classes.

  3. An interface defined with keyword "interface".

  4. In WCF, we use interface inside the [ServiceContract] attribute.

  5. Interfaces don't have their own objects.

What are the benefits of using interface in our WCF application?

  • Interfaces can extend/inherit other interfaces .

  • A single class can implement multiple interfaces .

  • You can modify the implementation of a service without breaking the contract .

Code:

[ServiceContract]
 Public Interface IHello
{
[OperationContract]
 string HelloWorld();

[OperationContract]
 string HelloComputer();
}
 public class Hello : IHello
{
 string IHello.HelloWorld()
{
 return "Hello world";
}
 string IHello.HelloComputer()
{
 return "Hello computer";
}
}