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What Are the File System Classes
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Inside the System.IO namespace are a set of classes used to navigate and manipulate files, directories, and drives. The file system classes are separated into two types of classes: informational and utility. Most of the informational classes derive from the FileSystemInfo base class. These classes expose all the system information about file system objects specifically, files, directories, and drives. These classes are named FileInfo and DirectoryInfo. In addition, the DriveInfo class represents a drive in the file system, but although it is still an informational class, it does not derive from the FileSystemInfo class because it does not share the common sorts of behavior (for example, you can delete files and folders, but not drives). The utility classes provide static methods (or shared ones for Visual Basic) to perform certain operations on file system objects such as files, directories, and file system paths. These utility classes include the File, Directory, and Path classes.
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The FileSystemInfo Class
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The FileSystemInfo class provides the basic functionality for all informational file system classes. Table 2-1 shows the most important FileSystemInfo properties.
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Input/Output (I/O)
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Table 2-1
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FileSystemInfo Properties
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Name Attributes CreationTime Exists Extension FullName LastAccessTime LastWriteTime Name
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Description Gets or sets FileAttributes of the current file or directory. Gets or sets the time that the current file or directory was created. Determines whether the file or directory exists. Gets a string representation of the extension part of the file or directory. Gets the full path to the file or directory. Gets or sets the time the file or directory was accessed. Gets or sets the time the file or directory was last written to. Gets the simple name for the file or directory. For a file, this is the name within the directory. For a directory, this is the last directory name in the directory hierarchy.
Table 2-2 shows the most important FileSystemInfo methods.
Table 2-2
FileSystemInfo Methods
Name Delete Refresh
Description Removes the file or directory from the file system Updates the data in the class with the most current information from the file system
The FileInfo Class
The FileInfo class provides the basic functionality to access and manipulate a single file in the file system. Table 2-3 shows the most important FileInfo properties.
Lesson 1: Navigating the File System
Table 2-3
FileInfo Properties
Name Directory DirectoryName IsReadOnly Length
Description Gets the DirectoryInfo object that represents the directory that this file is stored within Gets the name of the directory that this file is stored within Gets or sets the flag that dictates whether the file can be modified or deleted Gets the length of the file
Table 2-4 shows the most important FileInfo methods.
Table 2-4
FileInfo Methods
Name AppendText CopyTo Create CreateText Decrypt Encrypt MoveTo Open OpenRead OpenText OpenWrite Replace
Description Creates a new StreamWriter that will allow appending text to the file. See Lesson 2 for more information. Makes a copy of the file in a new location. Creates a file based on the current file information. Creates a new StreamWriter and a new file for writing text. See Lesson 2 for more information. Decrypts a file that was encrypted by the current user. Encrypts a file so that only the current user can decrypt the information within the file. Moves the file to a new location. Opens the file with specific privileges (read, read/write, and so on). Opens the file with read-only access. Opens the file and returns a StreamReader to allow reading of text within the file. Opens the file with write-only access. Replaces a file with the information in the current FileInfo object.
2
Input/Output (I/O)
How to Get Information about a File
To obtain information about a specific file, follow this procedure:
Create a new FileInfo object by using the path to the file. Access the FileInfo object s properties.
For example, you can check whether a file exists by calling the FileInfo object s Exist property, as shown in the following code:
' VB Dim ourFile As FileInfo = New FileInfo("c:\boot.ini") If ourFile.Exists Then Console.WriteLine("Filename : {0}", ourFile.Name) Console.WriteLine("Path : {0}", ourFile.FullName) End If // C# FileInfo ourFile = new FileInfo(@"c:\boot.ini "); if (ourFile.Exists) { Console.WriteLine("Filename : {0}", ourFile.Name); Console.WriteLine("Path : {0}", ourFile.FullName); }
Using the FileInfo object this way allows code to interrogate the information about a file in the file system.
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