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CHAPTER 8
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The Navigation Framework is a feature in Silverlight that allows developers to implement a way to navigate through different pages within a Silverlight application, creating an experience similar to browsing through different pages of a web site. The framework also allows developers to create a history that can integrate with the browser enabling users to navigate forward and backward through the history using the browser s back and forward buttons. In this chapter, you will explore Silverlight s Navigation Framework and try out a couple of examples involving the different aspects of the framework.
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The two main objects that are contained in the Navigation Framework are the Frame and Page objects (see Figure 8-1). The Frame object is very similar to a ContentPlaceHolder in ASP.NET master pages and is the place holder for the different views to be loaded onto the page.
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Figure 8-1. Frame and Page objects
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CHAPTER 8 NAVIGATION FRAMEWORK
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Try It Out: Creating a Silverlight Navigation Application
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This exercise demonstrates creating a Silverlight application with navigation support from scratch using the Navigation Framework. In the exercise, you will build a simple application that will contain two HyperlinkButtons and a Frame. Clicking the links will load one of two Pages into the Frame. Let s get started. 1. 2. Start Visual Studio 2010 and select File New Project from the main menu. In the New Project dialog box, select Silverlight as the project type and Silverlight Application as the template. Name the project NavAppFromScratch, as shown in Figure 8-2.
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Figure 8-2. Creating a new Silverlight application 3. When the New Silverlight Application dialog appears, select the default to host the Silverlight application in a new ASP.NET web application named NavAppFromScratch.Web. Press OK to continue. By default the MainPage.xaml file will be created and opened for editing. You will start by editing that file. In the Grid definition, add ShowGridLines="True" so you can see how your cells are laid out. You can turn this property off later so your application is cleaner. Next you want to define the Grid cells. You will simply have two rows, one for the links and one for the navigated content.
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CHAPTER 8 NAVIGATION FRAMEWORK
<Grid ShowGridLines="True" x:Name="LayoutRoot" Background="White"> <Grid.RowDefinitions> <RowDefinition Height="30" /> <RowDefinition></RowDefinition> </Grid.RowDefinitions> </Grid> 6. Now that you have the two rows, you want to add your HyperlinkButtons that will be used to navigate to the different views. You will do this in a horizontal StackPanel. For the Click property, create an event handler called LinkClick. <Grid ShowGridLines="True" x:Name="LayoutRoot" Background="White"> <Grid.RowDefinitions> <RowDefinition Height="30" /> <RowDefinition></RowDefinition> </Grid.RowDefinitions> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <HyperlinkButton Content="View 1" Click="LinkClick" Padding="5" /> <HyperlinkButton Content="View 2" Click="LinkClick" Padding="5" /> </StackPanel> </Grid> 7. The next step will be to add support for the Navigation Framework in your project. The first step is to add a reference to System.Windows.Controls. Navigation.dll by right-clicking on the References folder in your Silverlight project and choosing Add Reference, as shown in Figure 8-3.
CHAPTER 8 NAVIGATION FRAMEWORK
Figure 8-3. The Silverlight navigation application contents 8. When the Add Reference dialog appears, be sure the .NET tab is selected and then browse through the list until you find System.Windows.Controls. Navigation, as shown in Figure 8-4. Select the entry and press OK to add the reference to the project.
CHAPTER 8 NAVIGATION FRAMEWORK
Figure 8-4. The Silverlight navigation application references 9. When the assembly is added you will see it appear under References in the Solution Explorer, as shown in Figure 8-5.
CHAPTER 8 NAVIGATION FRAMEWORK
Figure 8-5. The Silverlight navigation application contents with reference 10. Now that you have added the reference to the Navigation Framework, you need to add the navigation objects to your application. You will start by adding the XML namespace for System.Windows.Controls.Navigation to the UserControl definition. <UserControl x:Class="NavAppFromScratch.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:nav="clr-namespace:System.Windows.Controls; assembly=System.Windows.Controls.Navigation" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" Background="White" ShowGridLines="True"> <Grid.RowDefinitions> <RowDefinition Height="30" /> <RowDefinition></RowDefinition> </Grid.RowDefinitions>
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