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CHAPTER 9 ISOLATED STORAGE IN SILVERLIGHT
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private void btnOpenFile_Click(object sender, RoutedEventArgs e) { } } 13. Run the application. Once again, press F5 to start debugging. Barring any typos, the Silverlight application should appear as shown in Figure 9-5.
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Figure 9-5. Application with left portion layout It s looking good so far! You are almost finished with the application layout. Now, let s move on to the right column and add the final controls. At the bottom of your Grid definition within Grid.Row and Grid.Column (0,1), place another StackPanel. Within it, add a TextBox named txtFileName that will contain the name of the file being edited, along with a Button control named btnSave, which will save the file referred to in txtFileName. Your XAML should look as follows:
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<Grid x:Name="LayoutRoot" Background="White" ShowGridLines="True"> ... </StackPanel> <StackPanel VerticalAlignment="Bottom" Orientation="Horizontal" Grid.Row="0" Grid.Column="1"> <TextBox x:Name="txtFileName" Text="File1.txt" Margin="5" Width="300" Height="30" FontSize="15"> </TextBox> <Button x:Name="btnSave" Margin="5" Content="Save" Width="100" Height="30" Click="btnSave_Click"> </Button> </StackPanel> </Grid> 14. While you are at it, go ahead and have Visual Studio create the event handler for btnSave_Click. Right-click it and choose the Navigate to Event Handler option to add the following handler: public partial class MainPage : UserControl { ... private void btnSave_Click(object sender, RoutedEventArgs e) { } } 15. Navigate back to the XAML.Within Grid.Row and Grid.Column (1,1), add a TextBox named txtContents, which will display the contents of the opened file, as follows:
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<Grid x:Name="LayoutRoot" Background="White" ShowGridLines="True"> ... </StackPanel> <TextBox x:Name="txtContents" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Auto" AcceptsReturn="True" BorderBrush="Black" BorderThickness="2" Margin="5" Grid.Column="1" Grid.Row="1" FontSize="15" FontFamily="Courier"> </TextBox> </Grid> Since this should be a multiline TextBox, you set the AcceptsReturn property to True. You also set the VerticalScrollBarVisibility property to Visible, which makes it always appear, and the HorizontalScrollBarVisibility property to Auto, which makes it appear only when there is enough text to require left and right scrolling. 16. Within Grid.Row and Grid.Column (1,2), place a StackPanel that contains five TextBlock controls, some that are simply cosmetic, and some that will be populated in the application s code, as follows: <Grid x:Name="LayoutRoot" Background="White" ShowGridLines="True"> ... </StackPanel> <TextBox x:Name="txtContents" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Auto" AcceptsReturn="True" BorderBrush="Black" BorderThickness="2" Margin="5" Grid.Column="1" Grid.Row="1" FontSize="15" FontFamily="Courier"> </TextBox> <StackPanel VerticalAlignment="Bottom" Orientation="Horizontal" Margin="5" Grid.Column="1" Grid.Row="2"> <TextBlock FontSize="13" Text="Available Space in Isolated Storage: " /> <TextBlock x:Name="txtAvalSpace" FontSize="13" Text="123" />
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<TextBlock FontSize="13" Text="kb / " /> <TextBlock x:Name="txtQuota" FontSize="13" Text="123" /> <TextBlock FontSize="13" Text="kb" /> </StackPanel> </Grid> With this, you are finished creating the application layout! You can now turn your attention to the code behind.
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Now let s add the functionality that demonstrates accessing Silverlight s isolated storage. 1. When the file explorer is started, it will do two things. First, it will load some sample directories and files in isolated storage. Second, it will populate the directories and files ListBox controls, as well as update the informative TextBlock controls. You will encapsulate these tasks into two methods: LoadFilesAndDirs() and GetStorageData(). Create a Loaded event handler and add these two method calls to the event. public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { LoadFilesAndDirs(); GetStorageData(); } private void LoadFilesAndDirs() { } private void GetStorageData() { } private void btnUpDir_Click(object sender, RoutedEventArgs e) { }
CHAPTER 9 ISOLATED STORAGE IN SILVERLIGHT
private void btnOpenDir_Click(object sender, RoutedEventArgs e) { } private void btnOpenFile_Click(object sender, RoutedEventArgs e) { } private void btnSave_Click(object sender, RoutedEventArgs e) { } 2. }
Next, add references to two namespaces for your application. Also, create a global string variable called currentDir, which will store the current directory. using ... using System.IO; using System.IO.IsolatedStorage; namespace ISExplorer { public partial class MainPage : UserControl { private string currentDir = ""; public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } } ...
} 3.
Let s implement the LoadFilesAndDirs() method. The first step is to get an instance of the user s isolated storage for the application using the IsolatedStorageFile class s GetUserStoreForApplication() method. You will do this within a C# using statement so the instance is disposed of automatically. private void LoadFilesAndDirs() { using (var store = IsolatedStorageFile.GetUserStoreForApplication()) { } }
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