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Sooner or later, you re likely to encounter cases where you ll want to customize your application depending on whether a dark or a light theme is currently active. For example, you may have a beautiful custom graphic within your application that simply does not render well when the background theme colors are changed; instead you would like to show a different graphic depending on the currently active theme. The following walkthrough shows you how to accomplish just that it detects the currently selected theme and adjusts the message based on whether the current theme has a light or a dark background. 1. Launch Visual Studio 2010 Express and select the Windows Phone Application template. Change the Project Name to DetectTheme, select OK, and Visual Studio will set up a new project.

The code begins by creating an instance of XPathDocument. An XPathNavigator is then obtained by calling CreateNavigator(). Then the code iterates through the document. The navigation logic should be familiar to you because we used it in previous examples. With each iteration, the employeeid attribute is checked against the value supplied from the text box. If they match, the ReadSubtree() method of XPathNavigator is called. In this case, this returns an instance of XmlReader that contains one <employee> node and all its child nodes. The returned XmlReader is passed to a helper function called DisplayDetails(), shown in Listing 4-9. Listing 4-9. DisplayDetails() Helper Function private void DisplayDetails(XmlReader reader) { while (reader.Read()) { if (reader.NodeType == XmlNodeType.Element) { switch (reader.Name) { case "firstname": label6.Text = reader.ReadString(); break; case "lastname": label7.Text = reader.ReadString(); break; case "homephone": label8.Text = reader.ReadString(); break; case "notes": label9.Text = reader.ReadString(); break; } } } reader.Close(); } The DisplayDetails() function iterates through the supplied XmlReader object calling its Read() method. With each iteration, the values of the <firstname>, <lastname>, <homephone>, and <notes> nodes are retrieved by using the ReadString() method of the XmlReader class and assigned to the labels. Finally, the reader is closed by calling its Close() method.

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CHAPTER 6 ROCK RAIN LIVE!

Open MainPage.xaml in design mode, and add a TextBlock to the page. For this walkthrough, you will simply modify the message within this TextBlock; for real-world applications, you will probably choose to do something a bit more exotic than this, such as showing different images. Open MainPage.xaml.cs (right-click MainPage.xaml in Solution Explorer and choose View Code) and add the following code to the MainPage() constructor, right below the InitializeComponent() method: Visibility v = (Visibility)Resources["PhoneLightThemeVisibility"]; if (v == System.Windows.Visibility.Visible) { textBlock1.Text = "Let there be light!"; } else { textBlock1.Text = "It's dark!"; }

Note The position of XPathNavigator remains unaffected even after calling the ReadSubtree() method.

Notice how you are using the Visibility property to determine whether the light theme is visible, and to then take action accordingly. Press F5 to run the application. If you still have a light background selected from the previous walkthrough, you will see a Let there be light! message. Otherwise, a It s dark! message will be displayed. In the previous sections of this chapter, we touched on the basics of theming and took a look at how to make your application theme-aware and how to customize its behavior based on the theme selected. Now, you will look at the controls provided as part of Windows Phone 7 Developer tools, since it s those controls that really complete the Metro experience.

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