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Figure 8-20. Multiple navigation frames
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In this chapter, you looked at the Navigation Framework in-depth and saw how it can be used to build Silverlight applications that contain multiple page views. You explored the different objects within the Navigation Framework, such as the NavigationContext and NavigationService, as well as how to implement Uri Mapping within your applications.
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Isolated Storage in Silverlight
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Localized storage in Silverlight is handled by its isolated storage feature, which is a virtual file system that can be used to store application data on the client s machine. As just a few examples, you might use local storage in your application to store user settings, undo information, shopping cart contents, or a local cache for your commonly used objects. Implementations of this feature are really limited only by your imagination. In this chapter, you will explore Silverlight s isolated storage. I will walk you through building a virtual storage explorer to view the directories and files contained within isolated storage for an application. In addition, you will look at the isolated storage quota and how to increase the quota size for your Silverlight applications.
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Note Silverlight 4 adds the ability for developers to create out-of-browser applications with elevated security. With this elevated access comes the ability to access the client s local hard drive. In this chapter we are discussing the isolated storage features of Silverlight only. For more information on creating applications with elevated security, see 16.
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Working with Isolated Storage
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Storing application information has always been a challenge for developers of traditional web applications. Often, implementing such storage means storing information in cookies or on the server, which requires using a postback to retrieve the data. In the case of desktop applications, implementing storage for application information is significantly easier, as developers have more access to the user s hard drive. Once again, Silverlight bridges the gap between desktop applications and web applications by offering isolated storage. Using the Silverlight classes for working with isolated storage, you can not only store settings locally, but also create files and directories, as well as read and write files within isolated storage.
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Using the Isolated Storage API
The classes for accessing isolated storage are contained within the System.IO.IsolatedStorage namespace. This namespace contains the following three classes: IsolatedStorageFile IsolatedStorageFileStream IsolatedStorageSettings
You ll look at each class to see what it represents.
The IsolatedStorageFile class represents the isolated storage area, and the files and directories contained within it. This class provides the majority of the properties and methods used when working with isolated storage in Silverlight. As an example, in order to get an instance of the user s isolated storage for a given application, use the static method GetUserStoreForApplication(), as follows: using (var store = IsolatedStorageFile.GetUserStoreForApplication()) { //... } Once the storage instance has been retrieved, a number of operations are available, including CreateDirectory(), CreateFile(), GetDirectoryNames(), and GetFileNames(). Also, the class has properties, such as Quota and AvailableFreeSpace. The following example creates a directory in isolated storage called Directory1, and then it retrieves the total and available free space in isolated storage: using (var store = IsolatedStorageFile.GetUserStoreForApplication()) { store.CreateDirectory("Directory1"); long quota = store.Quota; long availableSpace = store.AvailableFreeSpace; }
The IsolatedStorageFileStream class represents a given file. It is used to read, write, and create files within isolated storage. The class extends the FileStream class, and in most cases, developers will use a StreamReader and StreamWriter to work with the stream. As an example, the following code creates a new file named TextFile.txt and writes a string to the file:
using (var store = IsolatedStorageFile.GetUserStoreForApplication()) { IsolatedStorageFileStream stream = store.CreateFile("TextFile.txt"); StreamWriter sw = new StreamWriter(stream); sw.Write("Contents of the File); sw.Close(); }
The IsolatedStorageSettings class allows developers to store key/value pairs in isolated storage. The key/value pairs are user-specific and provide a very convenient way to store settings locally. The following example demonstrates storing the user s name in IsolatedStorageSettings: public partial class MainPage : UserControl { private IsolatedStorageSettings isSettings = IsolatedStorageSettings.ApplicationSettings; public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); this.cmdSave.Click += new RoutedEventHandler(cmdSave_Click); } void cmdSave_Click(object sender, RoutedEventArgs e) { isSettings["name"] = this.txtName.Text; SetWelcomeMessage(); } void Page_Loaded(object sender, RoutedEventArgs e) { SetWelcomeMessage(); } private void SetWelcomeMessage() { if (isSettings.Contains("name")) { string name = (string)isSettings["name"]; this.txtWelcome.Text = "Welcome " + name; }
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