Introducing Polymorphism
Polymorphism is another key concept in the object-oriented programming. As its name implies, polymorphism enables an object to assume different forms. In .NET development, it basically means that you can treat an object as another one, due to the implementation of common members. A first form of polymorphism is when you assign base classes with derived classes. For example, both Contact
and Customer
classes are derived of the Person
class. Now consider the following code:
The new instance of the Person
class receives an assignment from an instance of the Contact
class. This is always possible because Person
is the parent ...
Get Visual Basic® 2010 Unleashed now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.