Manipulating XAML Elements Programmatically in .NET

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Manipulating XAML Elements Programmatically
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A very useful feature of code-behind pages when programming .NET Silverlight applications is the ability to access and manipulate the controls defined by XAML elements. XAML is very limited when it comes to providing functionality to a Web site. That is where the code-behind pages come in. With the code-behind pages, you can programmatically access XAML elements to modify the user interface dynamically to provide a much better experience for the user. The following sections take you through the basics of accessing XAML elements, creating new XAML elements, and deleting existing XAML elements.
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Programming Silverlight Applications
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Accessing namescoped XAML elements
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The first step in accessing XAML element is to give them a name using the x:Name attribute. The x:Name exposes the XAML element as an object in the code-behind page by adding it to the XAML namescope when the XAML is parsed. Objects in the namescope are accessible in the code-behind pages using C# or Visual Basic. For example, the following XAML TextBlock element uses x:Name= myText to expose the XAML element:
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<TextBlock x:Name= myText Text= Some Plain Text HorizontalAlignment= Center VerticalAlignment= Top />
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From the code-behind page, you can access the TextBlock element and get the value of the Text attribute by using the following C# code:
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String textValue = myText.Text;
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Using this method, you can access almost all attributes, methods, and events of the Silverlight XAML elements.
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Modifying existing Silverlight XAML elements
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You can also modify the Silverlight XAML elements from code-behind pages by accessing the exposed object. You can change values, add event handlers, and use any of the object s methods. Most of the programming that you do with Silverlight involves using the code-behind pages to manipulate the XAML elements that are rendered to the browser. Consider the following code in Listing 8.1 of a basic Silverlight XAML file that adds a TextBlock and a Button control to a Grid.
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Simple XAML File That Implements the x:Name Attribute to a TextBlock and Button Element
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<UserControl x:Class= proj0801.Page xmlns= xmlns:x= Width= 400 Height= 200 > <Grid x:Name= LayoutRoot Background= White > <TextBlock x:Name= myText Text= Some Plain Text HorizontalAlignment= Center VerticalAlignment= Top />
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Programming .NET Silverlight Applications
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<Button x:Name= myButton Content= Change Text Height= 30 Width= 80 /> </Grid> </UserControl>
The TextBlock element is added to the XAML namescope as myText and the Button is added as myButton. Using the C# code-behind file in Listing 8.2, the TextBlock control can be modified.
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C# Code-Behind File That Accesses the TextBlock XAML Element and Modifies It Dynamically
using using using using using using System; System.Windows; System.Windows.Controls; System.Windows.Input; System.Windows.Media; System.Windows.Media.Animation;
namespace proj0801 { public partial class Page : UserControl { public Page() { InitializeComponent(); myButton.Click += new RoutedEventHandler(myButton_Click); } void myButton_Click(object sender, RoutedEventArgs e) { myText.FontFamily = new FontFamily( Comic Sans MS ); myText.FontSize = 30; myText.Text = Some Cool Text ; myButton.Content = Clicked ; } } }
Part III
Programming Silverlight Applications
The code in Listing 8.2 is able to implement an event handler for the Button element using the following line of code because the Button element was added to the namescope as myButton:
myButton.Click += new RoutedEventHandler(myButton_Click);
Figure 8.1 shows the results of clicking the button in the Web browser. Inside the event handler for the button, the code in Listing 8.2 is able to modify the FontFamily, FontSize, and Text attributes of the TextBlock element and modify the Content attribute of the Button element using the myText and myButton names in the namespace.
FIGURE 8.1 Simple Silverlight application that adds a Button and TextBlock element to the namescope and then modifies them programmatically when the button is clicked
Dynamically adding/removing XAML elements
In addition to modifying existing XAML elements, Silverlight provides the ability to dynamically add and remove elements. This gives you the flexibility to change the complete look and feel of your application during runtime. For example, you could create a Silverlight form element that implements a series of TextBlock and TextBox elements to collect data and then when the data is entered, remove all of the TextBlock and TextBox elements and replace them with a rich media view with images and movies. The following sections describe the process and give an example of creating and removing elements from a Silverlight application.