You can include a parameter in a method whose type is an interface, allowing you to pass interface variables into the method.
For example, we can write a method that takes variable of type IMoo.
1 2 3 4 5 | private static void DoSomeMooing(IMoo mooer){ for (int i = 0; i < 3; i++) mooer.Moo();} |
We can now pass into this method a reference to any object that implements IMoo.
We might pass in an interface variable:
1 2 3 | Cow bessie = new Cow("Bessie", 4);IMoo viaMoo = bessie;DoSomeMooing(viaMoo); |
We could also just pass an instance of a Cow directly into the method. It will be implicitly cast to a reference of typeIMoo and so the DoSomeMooing method will have access only to the members of Cow that are part of IMoo.
1 2 3 | Cow bessie = new Cow("Bessie", 4);DoSomeMooing(bessie); |