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Try it Out: Uri Mapping and the Navigation Framework
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In this example, you will work through implementing Uri Mapping with the project that you have been working with earlier in the chapter . 1. 2. Begin by opening the project Ch7_NavAppFromScratch you were working on in the previous section. There are three views in your solution that you would like to add Uri Mapping for: View1.xaml, View2.xaml, and InnerView1.xaml. For these, you will add simple Uri Maps that point these to View1, View2, and InnerView. Start by opening the App.xaml file and adding the xml namespace for the navigation framework.
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<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="Ch8_NavAppFromScratch.App" xmlns:nav="clrnamespace:System.Windows.Navigation;assembly=System.Windows.Controls.Navigation"> <Application.Resources> </Application.Resources> </Application> 3. Now that the namespace is added, you need to add the UriMapper section to the Application Resources.
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<Application.Resources> <nav:UriMapper x:Key="uriMapper"> </nav:UriMapper> </Application.Resources> 4. Within the UriMapper section you now need to add two UriMapping elements, one for View1.xaml and one for View2.xaml. Each mapping will contain two attributes: The Uri attribute is the name representing the mapping that will appear in the browser address bar, and the MappedUri attribute represents the actual Uri mapped to by the UriMapping.
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<Application.Resources> <nav:UriMapper x:Key="uriMapper"> <nav:UriMapping Uri="View1" MappedUri="/View1.xaml" /> <nav:UriMapping Uri="View2" MappedUri="/View2.xaml" /> </nav:UriMapper> </Application.Resources> 5. You now can update MainPage.xaml to navigate to the views using the UriMappings.
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CHAPTER 7 NAVIGATION FRAMEWORK
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<StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <HyperlinkButton Content="View 1" Click="LinkClick" Tag="View1" Padding="5" /> <HyperlinkButton Content="View 2" Click="LinkClick" Tag="View2" Padding="5" /> </StackPanel> 6. Next, you will shift your attention to the InnerView1.xaml. If you recall in the previous section on passing data to a navigation view, you are passing the color to InnerView1.xaml via the QuervString. Because of this, you need that to be taken into account in your UriMapping. Open up the code behind for View1.xaml and modify the Button_Click method so it navigates to InnerView/{0}.
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private void Button_Click(object sender, RoutedEventArgs e) { string color = Color.SelectionBoxItem.ToString(); NavigationService.Navigate( new Uri(string.Format("InnerView/{0}", color), UriKind.Relative)); } 7. In order for this navigate to work, you need to add an additional UriMapping to the Application.Resources.
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<Application.Resources> <nav:UriMapper x:Key="uriMapper"> <nav:UriMapping Uri="View1" MappedUri="/View1.xaml" /> <nav:UriMapping Uri="View2" MappedUri="/View2.xaml" /> <nav:UriMapping Uri="InnerView/{c}" MappedUri="/InnerView1.xaml Color={c}" /> </nav:UriMapper> </Application.Resources> 8. Next, in the MainPage.xaml, add the UriMapper property to the Navigation Frame object.
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<navigation:Frame x:Name="ContentFrame" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" Margin="10" Grid.Row="1" BorderThickness="2" BorderBrush="Black" UriMapper="{StaticResource uriMapper}" />
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CHAPTER 7 NAVIGATION FRAMEWORK
You are now ready to run the solution. Select Debug Start Debugging or press F5 to run the application. When Internet Explorer opens the application, click on the View 1 link at the top. Notice that the URL now reads:
Ch8_NavAppFromScratchTestPage.aspx#View1 10. Now select Red and click on the Navigate to Inner View and once again inspect the URL: Ch8_NavAppFromScratchTestPage.aspx#InnerView/Red As you have seen in this example, UriMapping provide a way to create more user friendly Url addresses and also provide a way to hide application specific information from appearing in your application.
URI ROUTING
In addition to Uri Mapping, the Navigation Framework in Silverlight 3 supports Uri Routing. For example, if you placed all of your navigation views in a subdirectory named Views, you can follow a naming convention that you set. Then setup Uri Routes such as the following:
<nav:UriMapping Uri="{}{p}" MappedUri="/Views/{p}.xaml" />
This mapping will map all files within the Views directory to its filename minus the extension. For example, /Views/View1.xaml would map to View1 and /Views/AboutPage.xaml would map to AboutPage. As you can see if you are able to set a naming convention that you can follow, Uri Routing can really help you handle default mappings with the navigation framework.
Silverlight Navigation Application Template
While it is very possible to utilize the Navigation Framework from within a standard Silverlight application, Visual Studio 2008 contains a project template that will create a base Silverlight Navigation Application.
Try it Out: Using the Silverlight Navigation Application Template
In this example, you will create a base Silverlight application with navigation support using the built in Silverlight Navigation Application template included in Visual Studio 2008. 1. 2. Start Visual Studio 2008 and select File menu. New Project from the main
In the New Project dialog box, select Silverlight as the project type and Silverlight Navigation Application as the template. Name the project Ch7_UsingNavTemplate, as shown in Figure 7-16.
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