Murach's Visual Basic 2005
How to work with inheritance

This chapter shows you how inheritance is used throughout the .NET classes and how you can use inheritance in your own Visual Basic classes. When you're done, you'll know how to create base and derived classes, how polymorphism works, and how to use casting with inheritance. To make sure that you get all of that, this chapter presents a complete application that uses a Product base class, Book and Software derived classes, and a ProductList class that inherits the List() class (one of the new typed collection classes available from .NET 2.0). Wow!
Chapter 19 How to work with inheritance
An introduction to inheritance 624
How inheritance works 624
How the .NET Framework uses inheritance 626
Methods inherited from the System.Object class 628
How to use inheritance in your applications 630
Basic skills for working with inheritance 632
How to create a base class 632
How to create a derived class 634
How polymorphism works 636
An inheritance version of the Product Maintenance application 638
The operation of the Product Maintenance application 638
The code for the Product, Book, and Software classes 640
The code for the ProductList class 644
The code for the Product Maintenance form 646
The code for the New Product form 648
Object types and casting 650
How to use the Type class to get information about an object's type 650
How to use casting with inheritance 652
How to work with abstract and sealed classes 654
How to work with abstract classes 654
How to work with sealed classes 656


© Copyright 1998-2008 Mike Murach & Associates, Inc.  All rights reserved.

Murach's VB 2005

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