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Inheritance is a form of code reuse. It allows one class to acquire and extend the functionality of another class. For example, you could create a class called TaxableProduct that inherits (or derives) from Product. The TaxableProduct class would gain all the same fields, methods, properties, and events of the Product class. (However, it wouldn t inherit the constructors.) You could then add additional members that relate to taxation. Here s an example that adds a read-only property named TotalPrice:

public class TaxableProduct : Product { private decimal taxRate = 115M; public decimal TotalPrice { get { // The code can access the Price property because it's // a public part of the base class Product // The code cannot access the private price variable, however return (Price * taxRate); } } // Create a three-argument constructor that calls the three-argument constructor // from the Product class public TaxableProduct(string name, decimal price, string imageUrl) : base(name, price, imageUrl) { } } There s an interesting wrinkle in this example With inheritance, constructors are never inherited However, you still need a way to initialize the inherited details (in this case, that s the Name, Price, and ImageUrl properties) The only way to handle this problem is to add a constructor in your derived class (TaxableProduct) that calls the right constructor in the base class (Product) using the base keyword.

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In the previous example, the TaxableProduct class uses this technique It includes a single constructor that requires the familiar three arguments and calls the corresponding three-argument constructor from the Product class to initialize the Name, Price, and ImageUrl properties The TaxableProduct constructor doesn t contain any additional code, but it could; for example, you could use it to initialize other details that are specific to the derived class Inheritance is less useful than you might expect In an ordinary application, most classes use containment and other relationships instead of inheritance, because inheritance can complicate life needlessly without delivering many benefits Dan Appleman, a renowned NET programmer, once described inheritance as the coolest feature you ll almost never use However, you ll see inheritance at work in ASPNET in at least one place Inheritance allows you to create a custom class that inherits the features of a class in the .

RetainedCanvas is a subclass of GameCanvas. This MIDlet takes advantage of GameCanvas s easy key polling and the simple rendering loop. To load the retained mode world, an M3G Loader class is used. The sole purpose of a Loader is to load in and reconstitute an instance of an Object3D subclass. Object3D subclasses include many of the objects you ve encountered, such as VertexBuffer, VertexArray, Material, PolygonMode, and so on. World is also an Object3D subclass. A World is a complete serialized 3D world, including all the 3D objects, transformation, light, camera, animation, etc. Also, a World is a specialized Group, another M3G class. A Group can contain multiple other Nodes. A Node can be a Camera, Mesh, Light, Group, or Sprite3D. This forms the data structure that

Note The full code for the MSMQ event handler can be found in the code download for the book, available

NET class library For example, when you create a custom web form, you actually inherit from a basic Page class to gain the standard set of features There are many more subtleties of class-based programming with inheritance For example, you can override parts of a base class, prevent classes from being inherited, or create a class that must be used for inheritance and can t be directly created However, these topics aren t covered in this book, and they aren t required to build ASPNET applications For more information about these language features, consult a more detailed book that covers the C# language, like Andrew Troelsen s Pro C# 2010 and the NET 4 Platform (Apress, 2010)..

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