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What Classes Facilitate Reading and Writing Data
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A number of classes take part in the process of reading and writing files. Most operations begin with the File class. This class exposes static methods (or shared methods in Visual Basic) that allow for opening and creating files. The File class can perform several types of operations:
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Atomic operations to read or write all the contents of a file
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Lesson 2: Reading and Writing Files
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Operations to create or open files for reading Operations to create or open files for writing Simple file operations (File.Exists, File.Delete, and so on)
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When a file is opened or created, the File class can return several types of objects. The most rudimentary of these is the FileStream object. This is a simple stream class, but it represents a file in the file system. In addition, the File class also has methods that return StreamReaders and StreamWriters. These classes wrap a FileStream to support sequential reading and writing to a stream. The simple file operations that the File class supports are identical to those of the FileInfo class discussed in Lesson 1. In addition to these classes, the MemoryStream class is a specialized stream for manipulating data in memory. This class is often used to create stream objects in memory for optimizations.
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The File Class
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The File class provides the basic functionality to open file streams for reading and writing. Table 2-16 shows the most important File static/shared methods.
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Table 2-16 File Static/Shared Methods
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Name AppendAllText AppendText
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Description Appends a specified string into an existing file, alternatively creating the file if it does not exist. Opens a file (or creates a new file if one does not exist) and returns a StreamWriter that is prepared to allow text to be appended to the file. Copies a file to a new file. The new file must not exist for Copy to be successful. Creates a new file and returns a FileStream object. Creates or opens a file and returns a StreamWriter object that is ready to have text written into it. Moves a file from one place to another.
Copy Create CreateText Move
2
Input/Output (I/O)
Table 2-16 File Static/Shared Methods
Name Open OpenRead OpenText OpenWrite ReadAllBytes ReadAllLines ReadAllText WriteAllBytes
Description Opens an existing file and returns a FileStream object. Opens an existing file and returns a read-only FileStream object. Opens an existing file and returns a StreamReader object. Opens an existing file for writing and returns a StreamWriter object. Opens a file, reads the contents of it into a byte array, and closes the file in one atomic operation. Opens a file, reads the contents of it into an array of strings (one per line), and closes the file in one atomic operation. Opens a file, reads the contents of it into a string, and closes the file in one atomic operation. Opens a file, writes the contents of a byte array into it (overwriting any existing data), and closes the file in one atomic operation. Opens a file, writes the contents of a string array into it (overwriting any existing data), and closes the file in one atomic operation. Opens a file, writes the contents of a string into it (overwriting any existing data), and closes the file in one atomic operation.
WriteAllLines
WriteAllText
The Directory Class
As it does with the File class, the .NET Framework supports the Directory class, which presents a static/shared interface for manipulating and creating directories in the file system. The Directory class provides the basic functionality to open file streams for reading and writing. Table 2-17 shows the most important Directory static/shared methods.
Lesson 2: Reading and Writing Files
Table 2-17 Directory Static/Shared Methods
Name CreateDirectory Delete Exists GetCreationTime GetCurrentDirectory GetDirectories GetDirectoryRoot GetFiles GetFileSystemEntries GetLastAccessTime GetLastWriteTime GetLogicalDrives GetParent Move SetCreationTime SetCurrentDirectory SetLastAccessTime SetLastWriteTime
Description Creates all the directories in a supplied path Deletes a specified directory Determines whether a directory exists in the file system Returns the creation time and date of a directory Returns a DirectoryInfo object for the current working directory of the application Gets a list of names for subdirectories in a specified directory Returns the volume and/or root information for a specified directory Returns the names of files in a directory Returns a list of subdirectories and files in the specified directory Returns the time that a specified directory was last accessed Returns the time that a specified directory was last written to Gets a list of drives in the current system as strings with the pattern of C:\ Gets the parent directory of the specified directory Moves a file or directory (and its contents) to a specified place Sets the time a specific directory was created Sets the specified directory to be the current working directory for an application Sets the last time a directory was accessed Sets the last time a directory was written to
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