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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 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

CreateDirectory()

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Creates a new directory. If you specify a directory inside another nonexistent directory, ASP.NET will thoughtfully create all the required directories. Deletes the corresponding empty directory. To delete a directory along with its contents (subdirectories and files), add the optional second parameter of true. Returns true or false to indicate whether the specified directory exists. Returns a DateTime object that represents the time the directory was created, accessed, or written to. Each Get method has a corresponding Set method, which isn t shown in this table. Returns an array of strings, one for each subdirectory, file, or drive in the specified directory (depending on which method you re using). This method can accept a second parameter that specifies a search expression (such as ASP*.*). Drive letters are in the format of c:\.

A second attribute, called , controls which widget is used when the field should be output into the HTML, but not shown to the user. This shouldn t have to be overridden, as the default widget is sufficient for most fields. Some fields, like the , need to specify more than one value, so a special is used on those cases. In addition to specifying individual widget classes for these situations, fields can also define a method to specify a set of attributes that should be added to whatever widget is used to render the field in HTML. It receives two arguments, the usual as well as ,a fully-instantiated widget object that any new attributes will be attached to. Rather than attaching the attributes directly, should return a dictionary of all the attributes that should be assigned to the widget. This is the technique the built-in uses to assign a attribute to the HTML input field.

Delete()

Exists() GetCreationTime(), GetLastAccessTime(), and GetLastWriteTime() GetDirectories(), GetFiles(), and GetLogicalDrives()

GetParent()

Widgets, as mentioned in the previous section, are how fields represent themselves in a Web page as HTML. While fields themselves deal more with data validation and conversion, widgets are concerned with presenting the form and accepting user input. Each field has a widget associated with it, which handles the actual interaction with the user. There are a variety of widgets provided by Django, from basic text inputs to checkboxes and radio buttons, even multiple-choice list boxes. Each field provided by Django has, as its attribute, the widget that is most appropriate for the most common use cases for that field, but some cases may find need for a different widget. These widgets can be overridden on an individual field basis by simply supplying a different class to the field s constructor as the argument.

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