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The boss notices that with the object-oriented code, he can create as many shapes as he wants in a logical way, whereas the procedural code expects him to have a mental note of the shapes he wants to work with. He isn t without his concerns, though. More lines of code means more time required, he says. Is it worth taking the objectoriented route if it means more lines of code, more time, and more hassles The object-oriented developer has heard this complaint before, and immediately springs into action. Try dealing with a large number of random shapes, he says. The boss isn t entirely up to date with modern development trends, but when he discovers that many new types of shapes can be produced easily by copying and pasting the existing classes with some minor tweaks, he begins to be won over. He also realizes that if a shape could be stored as an object referenced by a single variable, and that if each shape class accepted the same methods, the type of shape presented wouldn t matter (this quality is often referred to as polymorphism). He could call the perimeter or area method on any shape without worry. The procedural code, on the other hand, is just a jumble of different routines, and the developer would be forced to keep track of the different types of shapes to know which procedures to run. The Shape class also provides a way to give general functionality to all the different types of shapes if it s necessary in the future. The boss knows which code to choose! Object-oriented code requires a little more setup, but when it comes to scaling that code to fit real-life requirements, there s no contest! he says.

Figure 7-9. Adding the import declarations for Repository.Item and System results in a Cannot resolve error for both As you found in 6, resolving Repository.Item requires adding a reference to the Repository schema, contained in Repository.dll. Let s go ahead and add that reference by right-clicking on References in the right pane, and selecting Add Reference (see Figure 7-10).

Note It s worth noting that in the latter triangle example, the data provided is erroneous (how can a side

be 7.81 units long, yet the base be 6 units long ). The beauty of object-oriented programming, however, is that since the triangle is a single object, it would be easy to add a validation routine to check the parameters used to define the object and reject or recalculate those that are incorrect. With the procedural code, the developer would need to perform any checks manually every time he wanted to work with a triangle built from fresh data!

<UserControl.Resources> <Style x:Key="TextBoxStyle" TargetType="TextBox"/> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="White" > <StackPanel HorizontalAlignment="Left" VerticalAlignment="Top"> <TextBox Text="TextBox" TextWrapping="Wrap" Style="{StaticResource TextBoxStyle}"/> <TextBox Text="TextBox" TextWrapping="Wrap"/> <Button Content="Button"/> <Button Content="Button"/> </StackPanel> </Grid> 5. Next, you will set the different style attributes for your TextBoxStyle. Make certain that the TextBoxStyle is still in the Objects and Timeline panel, and from the

The basic advantage with object-oriented programming is that even if there s more structure involved in setting up your code, it s easy for a non-expert to understand how classes and objects relate, and it s easier to maintain and update the code to deal with real-life situations.

Let s recap the basic knowledge of classes and objects that you acquired over the past few chapters: A class is a blueprint for objects. You have only one class called Shape, but with it you can create multiple instances of shapes (Shape objects), all of which have the methods and attributes defined by the Shape class. An object is an instance of a class. If Shape is the class, then x = Shape.new creates a new Shape instance and makes x reference that object. You would then say x is a Shape object, or an object of class Shape.

Properties panel, set the following properties: FontSize: 22 FontFamily: Trebuchet MS Foreground: #FFFF0000 Margin: 5,5,5,5 If you now examine the XAML, you will see that Expression Blend has added a number of Setter elements to the TextBoxStyle, as follows:

In 2 you created some classes and added methods to them. To recap, here s a simple demonstration of a class with two methods, and how to use it. First, here s the class itself: class Square def initialize(side_length) @side_length = side_length end def area @side_length * @side_length end end Next, let s create some square objects and use their area methods: a = Square.new(10) b = Square.new(5) puts a.area puts b.area

Figure 7-10. Preparing to add a reference to the Repository schema This will bring up an Add Reference dialog box, as shown in Figure 7-11. Click the Browse tab, and browse to the folder containing the Repository.dll file. This will typically be in the Bin folder where Microsoft SQL Server was installed, which for the November CTP is normally