An interface works like a contract, the classes that implements an interface are guaranteed to implement the methods declared in the interface. This allows for the use of polymorphism in that a function can specify that it wants an object handle to an object that implements a certain interface. The function can then call the methods on this interface without having to know the exact type of the object that it is working with.
// The interface declaration
interface MyInterface
{
void DoSomething();
} // A class that implements the interface MyInterface
class MyClass : MyInterface
{
void DoSomething()
{
// Do something
}
}
A class can implement multiple interfaces; Simply list all the interfaces separated by a comma.