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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. .NET provides five basic classes for retrieving this sort of information. They are all located in the System.IO namespace (and, incidentally, can be used in desktop applications in exactly the same way they are used in web applications). They include the following: The Directory and File classes, which provide static methods that allow you to retrieve information about any files and directories visible from your server The DirectoryInfo and FileInfo classes, which use similar instance methods and properties to retrieve the same sort of information The DriveInfo class, which provides static methods that allow you to retrieve information about a drive and the amount of free space it provides In 3, you saw how a class can provide two types of members. Static members are always available you just use the name of the class. But instance members are only available if you have a live object. With the file access classes, static methods are more convenient to use because they don t require you to create an instance of the class. That means you can use a quick one-line code statement to perform a simple task like checking whether a file exists. On the other hand, if you need to retrieve several pieces of information from the same file or directory, it s easier to use the instance members. That way, you don t need to keep specifying the name of the directory or file each time you call a method. The instance approach is also a bit faster in this

Many of these options are fairly self-explanatory. For example, x_axis_colour controls the color of the x axis lines. The y_ticks parameter is a comma-delimited list of three parameters, which control the ticks (the small lines that point to numeric labels) on the left side of the graph. The first y_ticks parameter is the distance from the ticks to the labels, the second is the distance from the labels to the chart itself, and the third is the total number of ticks. You can get a full list of parameters from http://teethgrinder.co. uk/open-flash-chart/. The final line of the code converts the hash into key=value pairs surrounded by ampersands, which is the data format required by Open Flash Chart.

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situation. 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, which adds more overhead. You ll learn about all of these classes in this chapter. But first, it s worth taking a detour to look at another class that can simplify code that deals with the file system: the Path class.

A major part of Ajax is manipulating the DOM adding, showing, hiding, and removing elements, and so on. Although none of this code is terribly hard to write, it can get repetitious. To simplify this, Prototype adds static methods to the Element class (or in the case of browsers that do not properly support Element, it adds the class) that we can use to manipulate parts of the DOM. Let s start with simplifying hiding or showing elements. How often have you seen code like Listing 3-1

Along with the five classes outlined in the previous section, .NET also includes a helper class named Path in the same System.IO namespace. The Path class doesn t include any real file management functionality. It simply provides a few static methods that are useful when manipulating strings that contain file and directory paths. For example, the Path class includes a GetFileName() method that pulls the file name out of a full string. Here s an example: string file = Path.GetFileName( @"c:\Documents\Upload\Users\JamesX\resume.doc"); // file now contains "resume.doc"

Summary

In C#, you need to take special care when creating strings that hold file paths or directory paths. That s because in C#, the directory separation character (\) also has another meaning it indicates the start of a special character sequence. To indicate that you really want a backward slash and not a special character sequence, you need two slashes, as shown here: string myDirectory = "c:\\Temp\\MyFiles"; Another option is to precede your string with the at sign (@). This tells C# to interpret the string exactly as written. Here s an example of this syntax: string myDirectory = @"c:\Temp\MyFiles"; The approach you use is entirely up to you, although the @ syntax makes it easier to read long paths (and easier to avoid typos).

The Path class also includes a Combine() method that can tack a relative path on the end of an absolute path. Here it is at work, fusing two strings together: string absolutePath = @"c:\Users\MyDocuments"; string subPath = @"Sarah\worksheet.xls"; string combined = Path.Combine(absolutePath, subPath); // combined now contains "c:\Users\MyDocuments\Sarah\worksheet.xls" You could perform all of these tasks on your own, but the Path class is a great way to avoid errors. Table 18-1 lists the methods of the Path class.

Listing 3-1. Hide/Show (The Old Way)

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