Open Visual Studio. 2. Click File in C#

Creator Quick Response Code in C# Open Visual Studio. 2. Click File

1. Open Visual Studio. 2. Click File
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New Project.
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3. Select Silverlight as the project type. 4. Select Silverlight Application as the template. 5. Name the project OOP, as shown in Figure 3-2. 6. Click OK.
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C#, XAML, AND OBJECT-ORIENTED PROGRAMMING
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Figure 3-2. Create a new Silverlight application called OOP.
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7. When the New Silverlight Application dialog box appears, uncheck Host the Silverlight
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application in a new Web site, as shown in Figure 3-3, and then click OK.
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Figure 3-3. Uncheck the Host the Silverlight application in a new Web site check box.
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The first thing you are going to do is create an object. In keeping with the preceding discussion on OOP, you will call this object Fruit. You ll then add some common features that all fruits share. That is, all fruits are edible containers for a seed. So, let s create our Fruit object now:
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1. In Visual Studio s Solution Explorer, right-click the OOP project. 2. Click Add
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Class, as shown in Figure 3-4.
Figure 3-4. Add a new class.
3. When the Add New Item dialog box appears, name the new class Fruit, and click Add.
Now you can start adding your properties. You will make two Boolean properties IsEdible and HasSeed and set them both to true.
4. Inside the class, type private bool _IsEdible = true, as shown in Figure 3-5.
Figure 3-5. The _IsEdible class
5. Next, right-click the new property, click Refactor
and click OK.
Encapsulate Field, and then click OK.
6. When the Encapsulate Field dialog box shows up, uncheck Preview Reference Changes
What this does is turn your private variable into a public variable, and it also creates getters and setters for it, as shown in the following code: namespace OOP {
C#, XAML, AND OBJECT-ORIENTED PROGRAMMING
public class Fruit { private bool _IsEdible = true; public bool IsEdible { get { return _IsEdible; } set { _IsEdible = value; } } } } A requirement of our fruit is that it is always edible, and therefore no other object can ever set the IsEdible property to false. To fix this, what you do is remove the setter. Then other objects will be able to read the IsEdible property, but not set it. So, now your code should look like this: namespace OOP { public class Fruit { private bool _IsEdible = true; public bool IsEdible { get { return _IsEdible; } } } } Now that you have your Fruit superclass, you need to create a child for it. Let s create the Apple class.
7. Follow the same steps as you did previously to create a new class, but name this one Apple. 8. When the new class s code appears, enter : Fruit after the class declaration of public
class Apple, as shown here: namespace OOP { public class Apple : Fruit { } } This means that the Apple class extends the Fruit class, and thus is one of its children. And as you know from the discussion on inheritance, Apple will inherit everything that Fruit contains, namely IsEdible. You can prove this by going to MainPage.xaml.cs and instantiating (creating) an instance of Apple.
9. In MainPage.xaml.cs, instantiate an Apple object called apple (all lowercase) under the
InitializeComponent(); line, as shown here:
namespace OOP { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); Apple apple = new Apple(); } } } Now you can write some code that proves that Apple really is a child of Fruit.
10. Write a conditional statement that will tell you if the Apple class s IsEdible property is true,
as shown here: namespace OOP { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); Apple apple = new Apple(); if (apple.IsEdible == true) { MessageBox.Show("apple IsEdible is True"); } } } }
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11. You could actually stop here, because when you typed apple and then a period, Intellisense
showed you that one of the properties of apple is IsEdible. Since you have not even written any code in Apple, there is no way it could have this property if it weren t a child of Fruit. But to be complete, press F5 to compile and run the application, and you will see the message box shown in Figure 3-6.
Figure 3-6. The message box showing the value of IsEdible
C#, XAML, AND OBJECT-ORIENTED PROGRAMMING
12. Now let s create a new class called Orange. Follow the preceding steps to create the Orange
class, and make it extend Fruit. Your code should look like the following: namespace OOP { public class Orange: Fruit { } }
13. Now go back to MainPage.xaml.cs and instantiate an instance of the Orange class, as shown
here: namespace OOP { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); Apple apple = new Apple(); if (apple.IsEdible == true) { MessageBox.Show("apple IsEdible is True"); } Orange orange = new Orange(); } } } Now, you know full well that the new Orange object is going to have an IsEdible property, and that property is set to true, so let s do something a little more fun. What I want to do is to have each Fruit have its own color. I could easily go into the superclass and make a public string variable called color and set it to, say, Green. I would also put a setter on it so each fruit could either accept the default color of green, change its color property itself, or have some other object change it. But say I want to set the default color in the Fruit superclass to Empty or None, and I want to demand that the children of this class define a color for themselves. I could use something called an interface to do exactly that. Let s do that now:
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