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Table 2-38 shows the most important IsolatedStorageFileStream methods.
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Table 2-38 IsolatedStorageFileStream Methods
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Name Close Flush
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Description Closes the stream and releases any resources associated with it. (Inherited from the Stream class.) Clears any buffers within the stream and forces changes to be written to the underlying system or device. (Inherited from the Stream class.) Prevents other processes from changing all or part of the file. (Inherited from the FileStream class.) Performs a sequential read of a specified number of bytes from the current position and updates the position to the end of the read upon completion of the operation. (Inherited from the Stream class.) Performs the read of a single byte and updates the position by moving it by one. This method is identical to calling Read to read a single byte. (Inherited from the Stream class.) Sets the position within the stream. (Inherited from the Stream class.) Specifies the length of the stream. Will truncate the stream if the new length is less than the old length and will expand the stream if the reverse is true. (Inherited from the Stream class.) Allows other processes to change all or part of the underlying file. (Inherited from the FileStream class.) Writes information to the stream as a number of bytes and updates the current position to reflect the new write position. (Inherited from the Stream class.) Writes a single byte to the stream and updates the position. This method is identical to calling Write with a single byte. (Inherited from the Stream class.)
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ReadByte
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Seek SetLength
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Lesson 4: Working with Isolated Storage
Reading and Writing Data to Isolated Storage
Creating data within isolated storage is just like writing any other data into the file system, with the exception that you must use the IsolatedStorageFileStream class. You create a new IsolatedStorageFileStream object by creating a new instance of the class, specifying a relative file name and including a store object to specify which store to include it within. The following code snippet provides an example:
' VB Dim userStore as IsolatedStorageFile = _ IsolatedStorageFile.GetUserStoreForAssembly() Dim userStream As IsolatedStorageFileStream = New _ IsolatedStorageFileStream("UserSettings.set", _ FileMode.Create, _ userStore) // C# IsolatedStorageFile userStore = IsolatedStorageFile.GetUserStoreForAssembly(); IsolatedStorageFileStream userStream = new IsolatedStorageFileStream("UserSettings.set", FileMode.Create, userStore);
After creating a store, you can create a file stream by specifying the file name, the FileMode to use in opening or creating the file, and the store object you created. Once you have an instance of the IsolatedStorageFileStream class, working with it is identical to working with any file stream (like we did in Lesson 2). This is because IsolatedStorageFileStream derives from FileStream. The following code snippet provides an example:
' VB Dim userWriter As StreamWriter = New StreamWriter(userStream) userWriter.WriteLine("User Prefs") userWriter.Close() // C# StreamWriter userWriter = new StreamWriter(userStream); userWriter.WriteLine("User Prefs"); userWriter.Close();
In this example, you use a standard StreamWriter object to write data into your stream. Again, once you have the userStream object, working with it is identical to working with any file in the file system.
2
Input/Output (I/O)
Preparing to read the data back is as simple as creating a stream object by opening the file instead of creating it, as shown here:
' VB Dim userStream As IsolatedStorageFileStream = New _ IsolatedStorageFileStream("UserSettings.set", _ FileMode.Open, _ userStore) // C# IsolatedStorageFileStream userStream = new IsolatedStorageFileStream("UserSettings.set", FileMode.Open, userStore);
By simply changing the FileMode to Open, you can open the file instead of creating a new one. Unlike the application programming interface (API) for files stored arbitrarily in the file system, the API for files in Isolated Storage does not support checking for the existence of a file directly like File.Exists does. Instead, you need to ask the store for a list of files that match a particular file mask. If it is found, you can open the file, as shown in this example:
' VB Dim files() As String = userStore.GetFileNames("UserSettings.set") If files.Length = 0 Then Console.WriteLine("No data saved for this user") Else '... End If // C# string[] files = userStore.GetFileNames("UserSettings.set"); if (files.Length == 0) { Console.WriteLine("No data saved for this user"); } else { // ... }
You can use the GetFileNames method of the IsolatedStorageFile class to get a list of files that match your file name (or other file masks such as *.set). This replacement is adequate to test for the existence of the file before trying to read, delete, or replace the file.
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