What is an Interface in OOPS? - .Net Programming Classes in SLA Groups T Nagar Chennai

An interface is a contract. If you are defining an interface, then you are describing a set of rules. A class can follow the rules specified by the interface. When a class fulfills the contract or rules specified by the interface, we could say that a class implements the interface.

Interfaces in C# provide a way to achieve runtime polymorphism. Using interfaces we can invoke functions from different classes through the same interface reference, whereas using virtual functions we can invoke functions from different classes in the same inheritance hierarchy through the same reference.

Public interface <interface name>

{

//specify the contract

}

An interface looks like a class, but has no implementation. The only thing it contains are declarations of events, indexers, methods, and /or properties. The reason interfaces only provide declarations is that they are inherited by classes and structs, which must provide an implementation for each interface member declared.

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