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How to Enumerate Drives
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You follow this procedure to access the drives in a system: 1. Call the static GetDrives method (or a shared one in Visual Basic) of the DriveInfo class. 2. Loop through the array of DriveInfo objects returned by GetDrives. The following code example illustrates this process:
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' VB Dim drives() As DriveInfo = DriveInfo.GetDrives() Dim drive As DriveInfo For Each drive In drives Console.WriteLine("Drive: {0}", drive.Name) Console.WriteLine("Type: {0}", drive.DriveType) Next // C# DriveInfo[] drives = DriveInfo.GetDrives(); foreach (DriveInfo drive in drives) { Console.WriteLine("Drive: {0}", drive.Name); Console.WriteLine("Type: {0}", drive.DriveType); }
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As you can see, the GetDrives method of the DriveInfo object greatly simplifies the process of enumerating the drives in a system.
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NOTE Optical drives
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All types of optical drives (CD, CD/R, DVD, DVD/R, and so on) are marked as DriveInfo.CDRom.
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Lesson 1: Navigating the File System
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The Path Class
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The Path class provides methods for manipulating a file system path. Table 2-10 shows the most important Path methods.
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Table 2-10 Static Path Methods
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Name ChangeExtension
Description Takes a path and returns a new path with the file name s extension changed. (Note that only the path string changes, not the actual file name extension.) Combines two compatible path strings. Returns the name of the directory in the specified path. Returns the name of the file extension in the specified path. Returns the name of the file in the specified path. Returns the file name without the extension in the specified path. Returns a full path to the specified path. This method can be used to resolve relative paths. Returns the root directory name in the specified path. Generates a random file name. Generates a temporary file in the file system and returns the full path to the file. Returns the path to the temporary file directory for the current user or system. Indicates whether a specified path s file name has an extension. Indicates whether the specified path includes a root directory.
Combine GetDirectoryName GetExtension GetFileName GetFileNameWithoutExtension GetFullPath GetPathRoot GetRandomFileName GetTempFileName GetTempPath HasExtension IsPathRooted
2
Input/Output (I/O)
How to Change a File Extension
The Path class allows you interrogate and parse the individual parts of a file system path. Instead of writing your own string parsing code, the Path class allows you to answer most common questions you would have about a file system path. For example, if you want to get and change the extension of a file, you can do so with the Path class, as shown in the following code snippet:
' VB Dim ourPath As String = "c:\boot.ini" Console.WriteLine(ourPath) Console.WriteLine("Ext: {0}", Path.GetExtension(ourPath)) Console.WriteLine("Change Path: {0}", _ Path.ChangeExtension(ourPath, "bak")) // C# string ourPath = @"c:\boot.ini"; Console.WriteLine(ourPath); Console.WriteLine("Ext: {0}", Path.GetExtension(ourPath)); Console.WriteLine("Change Path: {0}", Path.ChangeExtension(ourPath, "bak"));
By using the GetExtension method of the Path class, you can get the current extension of a file system path. However, because the original goal was to change the path, you use the ChangeExtension method of the Path class.
The FileSystemWatcher Class
The FileSystemWatcher class provides methods for monitoring file system directories for changes. Table 2-11 shows the most important FileSystemWatcher properties.
Table 2-11 FileSystemWatcher Properties
Name EnableRaisingEvents
Description Gets or sets whether the watcher object should raise events. Normally, it s used to turn on and off the watching of a directory and/or files. Gets or sets the file filter to use to determine which file changes to monitor. A blank filter indicates all files.
Filter
Lesson 1: Navigating the File System
Table 2-11 FileSystemWatcher Properties
Name IncludeSubdirectories
Description Gets or sets an indicator of whether the watching of a directory is to include subdirectories or only the directory specified in the Path property. Gets or sets the type of changes to watch for. By default, all changes (creation, deletion, renamed files, and modifications) are notified. Gets or sets the path to the directory to monitor.
NotifyFilter
Path
Table 2-12 shows the most important FileSystemWatcher method.
Table 2-12 FileSystemWatcher Method
Name WaitForChanged
Description Synchronous method for watching a directory for changes and for returning a structure that contains all the changes
Table 2-13 shows the most important FileSystemWatcher events.
Table 2-13 FileSystemWatcher Events
Name Changed Created Deleted Renamed
Description Occurs when a file or directory has changed in the watched directory Occurs when a file or directory has been created in the watched directory Occurs when a file or directory has been deleted in the watched directory Occurs when a file or directory has been renamed in the watched directory
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