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Testing the Finished Application
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To test the completed application, press F5 on your keyboard and run it. In this brief demo, you ve learned to work with isolated storage files by storing a downloaded image into the isolated storage and then retrieving the image from the isolated storage. In the next demo, you will learn to interact with the name and value dictionary of the isolated storage settings.
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Working with Isolated Storage Settings
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In this section, you ll build an application that demonstrates CRUD operation (create, read, update, and delete) of System.IO.IsolatedStorage.IsolatedStorageSettings. We ve named it IsolatedStorageSettingsDemo. Figure 13 5 shows how its UI will look on a Windows Phone.
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CHAPTER 13 ISOLATED STORAGE
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Figure 13 5. IsolatedStorageSettingsDemo In the IsolatedStorageSettingsDemo application, as shown in Figure 13 5, when the Save button is clicked, the value in the Value text box will be added to the isolated storage settings using the key in the Key text box. Whenever new key-value pair data is added to the isolated storage settings, the key will be added to the list box of keys. When any of the keys in the list box of keys is selected, the Key text box and the Value text box will be populated with the data retrieved from the isolated storage settings. The Delete button will delete the selected key from the isolated storage settings. To build the demo, you ll first create a new project, then add XAML markup to create a new main page and its controls. Finally, you ll add behavior to the application with C# code that makes use of isolated storage APIs to save and retrieve key-value pairs.
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Creating a New Project
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To create the new IsolatedStorageSettingsDemo project, open Microsoft Visual Studio 2010 Express for Windows Phone. Select File New Project on the Visual Studio menu, select the Windows Phone Application template on the New Project dialogue, name the application IsolatedStorageSettingsDemo, and click OK, as shown in Figure 13 6. Now you ll build the application main page.
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Figure 13 6. Windows Phone Application template for creating IsolatedStorageSettingsDemo
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Building the Application UI (XAML)
To create the UI for IsolatedStorageSettingsDemo, go to Solution Explorer, open MainPage.xaml, and replace XAML with the following chunks of XAML markup in the sequence shown.
Selecting the UI Resources
The following code identifies where to find the UI controls that will be used to build this main page for this application. Using the namespace xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" will allow you to add common Windows Phone controls like text boxes, buttons, and list boxes, which will be used to create the main page. Also we are adding a reference to a code-behind class (x:Class="IsolatedStorageSettingsDemo.MainPage") that will handle the main page controls events. <phone:PhoneApplicationPage x:Class="IsolatedStorageSettingsDemo.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
CHAPTER 13 ISOLATED STORAGE
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" 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" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" shell:SystemTray.IsVisible="True">
Building the Main Page and Adding Controls
Now add the various controls and layouts you need to create the UI shown in Figure 13 5. <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="Isolated Storage Settings Demo" x:Name="textBlockListTitle" Style="{StaticResource PhoneTextTitle1Style}" FontSize="30" /> </Grid> <!--ContentGrid is empty. Place new content here--> <Grid x:Name="ContentGrid" Grid.Row="1"> <TextBox Height="72" HorizontalAlignment="Left" Margin="172,46,0,0" Name="txtKey" Text="" VerticalAlignment="Top" Width="212" /> <Button Content="Save" Height="70" HorizontalAlignment="Left" Margin="78,228,0,0" Name="btnSave" VerticalAlignment="Top" Width="160" Click="btnSave_Click" /> <ListBox Height="168" HorizontalAlignment="Left" Margin="94,392,0,0" Name="lstKeys" VerticalAlignment="Top" Width="274" BorderThickness="1" SelectionChanged="lstKeys_SelectionChanged" /> <TextBlock Height="39" HorizontalAlignment="Left" Margin="94,62,0,0" Name="textBlock1" Text="Key" VerticalAlignment="Top" /> <TextBox Height="74" HorizontalAlignment="Left" Margin="172,124,0,0" Name="txtValue" Text="" VerticalAlignment="Top" Width="212" /> <TextBlock Height="39" HorizontalAlignment="Left" Margin="94,140,0,0" Name="textBlock2" Text="Value" VerticalAlignment="Top" /> <Button Content="Delete" Height="70" HorizontalAlignment="Left" Margin="224,228,0,0" Name="btnDelete" VerticalAlignment="Top" Width="160" Click="btnDelete_Click" /> <TextBlock Height="39" HorizontalAlignment="Left" Margin="94,347,0,0" Name="textBlock3" Text="List of Keys" VerticalAlignment="Top" />
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</Grid> </Grid> </phoneNavigation:PhoneApplicationPage> Once you ve added the XAML markup blocks displayed in this section to MainPage.xaml, you should see the UI shown on the Visual Studio Design View tab in Figure 13 7.
Figure 13 7. IsolatedStorageSettingsDemo design view Now it s time to add behavior to the application.
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