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Inheritance
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Inheritance actually belongs to classes, but I want to give it its own section because it is a very important part of OOP. A class can be a child of another class and have child classes of its own. Basically, a class inherits all the traits of its parent. Here s a classic example that I see in nearly every OOP book: imagine you have a class called Fruit. Fruit is the parent class or superclass. Fruit has some child classes say, Apple, Orange, and Peach. All three subclasses Apple, Orange, and Peach inherit from their parent class Fruit. So they all know they are a fruit and have all the traits of the Fruit class (in other words, they are edible containers for the seed of a plant). So what is the advantage of inheritance Imagine if you didn t have inheritance. In the preceding example, you would have to tell Apple, Orange, and Peach via code that they are all edible containers for the seed of a plant. That would mean you would have to write the code three times, once for each class. That is a big waste of time, and most importantly, it s prone to errors, because if you type a block of code once, you have one chance of getting it wrong; type it three times, you have three chances of getting it wrong. With inheritance, your classes can all share the code of a superclass, and this saves you a lot of time because it generates fewer errors maybe not for this fruit example, but certainly for large applications with hundreds of thousands of lines of code.
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Modularity
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OOP encompasses the concept of modularity, which was first presented by Information & Systems Institute, Inc., at the National Symposium on Modular Programming in 1968. Modularity basically means
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C#, XAML, AND OBJECT-ORIENTED PROGRAMMING
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that large applications should be built-in modules that each have their own specific purpose. Further, these modules act independently within the application. The advantage to this type of programming is that modules can be reused in other applications or duplicated and used more than once in the same application. Another big advantage to this type of programming is that if you change the functionality of one module, you will not affect the functionality of any other module, as they have the ability to function independently of one another. Silverlight takes full advantage of this concept with classes and UserControls, which I cover in depth later in this book.
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Because OOP makes use of objects in its applications, and because these objects use classes that are built to be modular, the code is much easier to maintain than that of a traditional, procedural application. Say, for instance, you have a class called Foo. Foo has some complex functionality (exactly what is not important for this example). Foo has total encapsulation and is completely modular. So, if you go in and change Foo to give it some additional functionality, you know that you will not break the application, because no other object needs Foo in order to do its job. In procedural programming (non-OOP languages such as C, whereby the code is read line by line from top to bottom), it was very common for changes in one line of code in your application to cause some other part of your code to fail, because it was dependent on the line of code you changed, and thus the application would break. I think that is a pretty adequate outline of why OOP is worth using. But I have yet to finish telling you why C# is a great programming language. Let s continue.
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