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CHAPTER 13 ISOLATED STORAGE
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Figure 13 1. Using isolated storage API In this chapter, you will learn how to work with a phone s isolated storage. The first example will show you a technique to cache an image downloaded from the Web into the isolated storage file. The second demo will show you how to save and retrieve name and value pairs using isolated storage settings.
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We ll begin by building an application to work with the local storage on a phone. The application, IsolatedStorageStoreImageDemo, whose UI is shown in Figure 13 2, demonstrates the basic functions available through the isolated storage APIs, including the following: Retrieve application-specific isolated storage Get isolated storage quota Save and retrieve isolated storage files
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In this demo, when the Get Image button is clicked for the first time, the application checks to see whether there is enough space available in isolated storage. If there is, the image will be downloaded from the web site and then saved to isolated storage via isolated storage file stream. If the button is clicked again, the image will be loaded into an isolated storage file.
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Figure 13 2. IsolatedStorageStoreImageDemo You ll build the demo in three steps. First, you need to create a new Visual Studio project. Next you ll build the project s user interface and finish up by adding code to respond to commands from the user.
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Creating the IsolatedStorageStoreImageDemo Project
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To set up the IsolatedStorageStoreImageDemo project, follow the steps you ve used for previous examples in this book: 1. 2. Open Microsoft Visual Studio 2010 Express for Windows Phone on your workstation. Create a new Windows Phone Application by selecting File New Project on the Visual Studio command menu. Select the Windows Phone Application template, name the application IsolatedStorageStoreImageDemo, and click OK, as shown in Figure 13 3.
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Figure 13 3. Windows Phone Application template for creating IsolatedStorageStoreImageDemo
Coding the User Interface
You ll first code the user interface, which we ve chosen to implement in XAML. Sometimes it is faster to work with XAML than with managed code, especially when you re working with a simple example, like this one, which requires only a few controls. Go to the Solution Explorer, open MainPage.xaml, and replace the XAML you find there with the code that appears in the following sections.
Selecting the UI Resources
Begin by adding the following XAML markup to MainPage.xaml to identify where the resource to build the application s main page will be found. <phone:PhoneApplicationPage x:Class="IsolatedStorageStoreImageDemo.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
CHAPTER 13 ISOLATED STORAGE
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" shell:SystemTray.IsVisible="True"> Referencing the namespace as xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" allows you to use common Windows Phone controls such as text boxes, buttons, and list boxes to create the main page. The code snippet also includes a reference to a code-behind class (x:Class="IsolatedStorageStoreImageDemo.MainPage") that will handle the main page controls events.
Building the Main Page and Adding Components
Next, to create the main application page and populate it with controls, add the following XAML markup to the preceding block of code, also in MainPage.xaml. <Grid x:Name="LayoutRoot" Background="{StaticResource PhoneBackgroundBrush}"> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <!--TitleGrid is the name of the application and page title--> <Grid x:Name="TitleGrid" Grid.Row="0"> <TextBlock Text="IsolatedStorageStoreImageDemo" x:Name="textBlockPageTitle" Style="{StaticResource PhoneTextTitle1Style}" FontSize="28" /> </Grid> <!--ContentGrid is empty. Place new content here--> <Grid x:Name="ContentGrid" Grid.Row="1"> <Image Height="458" HorizontalAlignment="Left" Margin="20,134,0,0" Name="image1" Stretch="Uniform" VerticalAlignment="Top" Width="423" /> <Button Content="Get Image" Height="70" HorizontalAlignment="Left" Margin="0,598,0,0" Name="btnGetImage" VerticalAlignment="Top" Width="443" Click="btnGetImage_Click" /> <TextBox Height="72" HorizontalAlignment="Left" Margin="12,29,0,0" Name="txtImageUrl" Text="http://res1.newagesolution.net/Portals/0/twitter2_icon.jpg" VerticalAlignment="Top" Width="460" /> </Grid> </Grid> </phoneNavigation:PhoneApplicationPage>
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Once you ve loaded the XAML code for the main page, you should see the layout shown in Figure 13 4. Now it s time to use the Isolated Storage APIs to add behavior to the application, as you ll learn in the next section.
Figure 13 4. IsolatedStorageStoreImageDemo design view
Coding the Application
In Solution Explorer, open MainPage.xaml.cs and replace the code there with the following C# code blocks, in precisely the order in which they are presented.
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