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The simplest level of file access just involves retrieving information about existing files and directories and performing typical file system operations such as copying files and creating directories. These tasks don t involve actually opening or writing a file (both of which are tasks you ll learn about later in this chapter). The .NET Framework provides a few basic classes for retrieving file system information. They are all located in the System.IO namespace (and, incidentally, can be used in desktop applications in the same way they are used in web applications). They include the following: Directory and File: These classes provide static methods that allow you to retrieve information about any files and directories that are visible from your server. DriveInfo, DirectoryInfo, and FileInfo: These classes use similar instance methods and properties to retrieve the same information. These two sets of classes provide similar methods and properties. The key difference is that you need to create a DirectoryInfo or FileInfo object before you can use any methods, whereas the static methods of the Directory and File classes are always available. Typically, the Directory and File classes are more convenient for one-off tasks. On the other hand, if you need to retrieve several pieces of information, it s better to create DirectoryInfo and FileInfo objects. That way you don t need to keep specifying the name of the directory or file each time you call a method. It s also faster. That s because the FileInfo and DirectoryInfo classes perform their security checks once when you create the object instance. The Directory and File classes perform a security check every time you invoke a method.

The DirectoryInfo and FileInfo classes mirror the functionality in the Directory and File classes. In addition, they make it easy to walk through directory and file relationships. For example, you can easily retrieve the FileInfo objects of files in a directory represented by a DirectoryInfo object. Note that while the Directory and File classes expose only methods, DirectoryInfo and FileInfo provide a combination of properties and methods. For example, while the File class had separate GetAttributes() and SetAttributes() methods, the FileInfo class exposes a read-write Attributes property. Another nice thing about the DirectoryInfo and FileInfo classes is that they share a common set of properties and methods because they derive from the common FileSystemInfo base class. Table 13-3 describes the members they have in common. Table 13-3. DirectoryInfo and FileInfo Members

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Every XSL file has a root <stylesheet> element. The <stylesheet> element can contain one or more templates (the sample file has four). In this example, the first <template> element searches for the root element. When it finds it, it outputs the tags necessary to start an HTML page and then uses the <apply-templates> command to branch off and perform processing for any contained <DVD> elements, as follows: <xsl:template match="/"> <html> <body> <xsl:apply-templates select="//DVD" /> </body> </html> </xsl:template> Each time the <DVD> tag is matched, a horizontal line is added, and a heading is created. Information about the <Title>, <Price>, and <Director> tag is extracted and written to the page using the <value-of> command. Here s the full template: <xsl:template match="DVD"> <hr/> <h3><u><xsl:value-of select="Title" /></u></h3> <b>Price: </b> <xsl:value-of select="Price" /><br/> <b>Director: </b> <xsl:value-of select="Director" /><br/> <xsl:apply-templates select="Starring" /> </xsl:template>

The Directory and File classes provide a number of useful methods. Tables 13-1 and 13-2 tell the whole story. Note that every method takes the same parameter: a fully qualified path name identifying the directory or file you want the operation to act on. Table 13-1. Directory Methods

Allows you to retrieve or set attributes using a combination of values from the FileAttributes enumeration. Allows you to set or retrieve the creation time, last access time, and last write time using a Date object. Returns True or False depending on whether the file or directory exists. In other words, you can create FileInfo and DirectoryInfo objects that don t actually correspond to current physical directories, although you obviously won t be able to use properties such as CreationTime and methods such as MoveTo(). Returns a string that represents the fully qualified name, the directory or filename (with extension), or the extension on its own, depending on which property you use. Removes the file or directory, if it exists. When deleting a directory, it must be empty, or you must specify an optional parameter set to True. Updates the object so it s synchronized with any file system changes that have happened in the meantime (for example, if an attribute was changed manually using Windows Explorer). Creates the specified directory or file. Copies the directory and its contents or the file. For a DirectoryInfo object, you need to specify the new path; for a FileInfo object, you specify a path and filename.

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