WORKING WITH DATA in VB.NET

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CHAPTER 6 WORKING WITH DATA
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Table 6-12. Properties of the System.IO.IsolatedStorageFile Class
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The free isolated storage space, in bytes, for the current application; read-only property. A static property defines whether the isolated storage is enabled. Note that isolated storage for full .NET application is always enabled. This is a new read-only property in Silverlight 4. The maximum space allocated, in bytes, for the current application; read-only property. Provides total used isolated storage, in bytes. This is a new read-only property in Silverlight 4.
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Quota
long
UsedSize
long
Table 6-13. Key Methods of the System.IO.IsolatedStorageFile Class
Name
CopyFile
Description
Copy an existing file to a new file (or optionally overwrite an existing file). This is a new method in Silverlight 4. Attempts to create a directory based on the string path passed in. It can create a tree of directories by passing in a path such as \root\data. Attempts to create a file at the specified string path. If successful, it returns an instance of the IsolatedStorageFileStream class. Attempts to remove a directory from isolated storage. The directory must be empty for the delete to succeed. Attempts to delete a specific file from isolated storage. Returns true if the specified directory exists, and false otherwise. Implements IDisposable.Dispose() to release all resources used by the IsolatedStorageFile. Returns true if the specified file exists, and false otherwise. Returns the date and time of a specified file or directory when created.
CreateDirectory
CreateFile
DeleteDirectory
DeleteFile DirectoryExists Dispose
FileExists GetCreationTime
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GetDirectoryNames
Overloaded. The parameter-less version returns a string array of directory names from the root of the store. The overload accepts a string search expression to search subdirectories and also uses wildcards: the matches a single character and the * matches multiple characters. If no results are found, the Length property of the returned array will be 0. Overloaded. The parameter-less version returns a string array of files in the root of the store. The overload accepts a string search expression to search subdirectories and also uses wildcards: the matches a single character and the * matches multiple characters. If no results are found, the Length property of the returned array will be 0. Provides the date and time when the file or directory was last accessed. This is a new property in Silverlight 4. Provides the date and time when the file or directory was last written to. This is a new property in Silverlight 4. Static method. Used to get a reference to the isolated storage for the current user and application. Enables an application to increase the quota to a certain size, specified in bytes. Expanding the size of an isolated store causes a confirmation dialog to appear for user confirmation. It returns true if the new quota is accepted by the user, and false otherwise. Moves a specified directory and its content to a new specified location. This is a new property in Silverlight 4. Moves a specified file to a new specified location with or without rename. This is a new property in Silverlight 4. Overloaded. Opens a specified file from the store using the requested FileMode and, optionally, FileAccess and FileShare options. If successful, it returns an instance of the IsolatedStorageFileStream class. Removes all contents from the isolated storage and the store itself.
GetFileNames
GetLastAccessTime
GetLastWriteTime
GetUserStoreFor Application IncreaseQuotaTo
MoveDirectory
MoveFile
OpenFile
Remove
The System.IO.FileMode enumeration, a required parameter of all of the OpenFile overloads, contains the following options. Append: Appends to an existing file or creates the file if it does not exist. Create: Creates a file if one doesn t exist. If a file does exist, OpenFile will fail. CreateNew: Creates a file if one doesn t exist, and re-creates it if it does exist (use with caution).
CHAPTER 6 WORKING WITH DATA
Open: Opens a file. Unless Append is specified, it also sets the file pointer at the beginning of the file. OpenOrCreate: Opens the file if it exists, and creates it otherwise. Truncate: Removes all contents from the file. The System.IO.FileAccess enumeration contains the following options. It is used to specify the type of access requested to the file. Read: Allows only reading from the file. ReadWrite: Allows reading from and writing to the file. Write: Allows only writing to the file. The System.IO.FileShare enumeration contains the following options. It is used to specify the type of access concurrently granted to other FileStream objects. Delete: Allows the file to be deleted by others. Inheritable: Allows the file handle to be inherited by others. None: Disallows shared access. Read: Allows others to read from but not write to the file. ReadWrite: Allows others to read from and write to the file. Write: Allows others to write to the file but not read from it. To get more ideas about various isolated storage tasks regarding creating, reading, updating, and deleting files, visit http://msdn.microsoft.com/en-us/library/8dzkff1s.aspx. To get an IsolatedStoreFile object to work with isolated storage you need to use the IsolatedStoreFile.GetUserStoreForApplication static method. Following best practices in .NET, it s a good idea to always wrap this in a using statement so that Dispose is automatically called. using (IsolatedStorageFile rootStore = IsolatedStorageFile.GetUserStoreForApplication()) { // can now interact with isolated storage files/directories/etc. } The XmlReader example uses isolated storage to store an object in XML format. The IsolatedStorageFileStream inherits from System.IO.FileStream, so we can use it directly with the Serialize method since it can write to any Stream. XmlSerializer ser = new XmlSerializer(typeof(List<WebDeveloper>)); using (IsolatedStorageFile rootStore = IsolatedStorageFile.GetUserStoreForApplication()) { using (IsolatedStorageFileStream fs = new IsolatedStorageFileStream("WebDevelopers.xml", FileMode.Create, rootStore)) { ser.Serialize(fs, WebDevelopers); } }
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