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Input/Output (I/O)
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The FileAccess Enumeration
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The FileAccess enumeration provides members that are used to determine the rights required when opening a file. Table 2-18 shows the FileAccess members.
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Table 2-18 FileAccess Enumeration Members
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Name Read Write ReadWrite
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Description Specifies that the file should be opened with read-only access. Specifies that the file should be opened to be written to. The file cannot be read, only appended to. Specifies full access to the file for reading or writing. Equivalent to combining Read and Write values.
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The FileMode Enumeration
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The FileMode enumeration provides members that specify how a file is to be opened or created. Table 2-19 shows most of the FileMode members.
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Table 2-19 FileMode Enumeration Members
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Name Append Create CreateNew Open OpenOrCreate Truncate
Description Opens a file and moves the pointer in the FileStream to the end of the file. Can be used only with FileAccess.Write. Creates a new file. If the file already exists, it is overwritten. Creates a new file. If the file already exists, an exception is thrown. Opens an existing file. If the file does not exist, an exception is thrown. Opens an existing file. If the file does not exist, it creates a new file. Opens an existing file but empties the existing file so that it is zero bytes long.
Lesson 2: Reading and Writing Files
The FileStream Class
The FileStream class provides the basic functionality to open file streams for reading and writing. Table 2-20 and Table 2-21 show the most important FileStream properties and methods, respectively.
Table 2-20 FileStream Properties
Name CanRead CanSeek CanTimeout CanWrite Handle Length Name Position
Description Determines whether the stream supports reading. (Inherited from the Stream class.) Determines whether the stream supports seeking. (Inherited from the Stream class.) Determines whether the stream can time out. (Inherited from the Stream class.) Determines whether the stream can be written to. (Inherited from the Stream class.) Gets the stream s underlying file handle. Gets the length (in bytes) of the stream. (Inherited from the Stream class.) Gets the name of the file. Gets or sets the virtual cursor for determining where in the stream the current position is. The value of Position cannot be greater than the stream s length. (Inherited from the Stream class.) Gets or sets the stream s timeout for read operations. (Inherited from the Stream class.) Gets or sets the stream s timeout for write operations. (Inherited from the Stream class.)
ReadTimeout WriteTimeout
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Input/Output (I/O)
Table 2-21 FileStream Methods
Name Close Flush
Description Closes the stream and releases any resources associated with it. (Inherited from the Stream class.) Clears any buffers within the stream and forces changes to be written to the underlying system or device. (Inherited from the Stream class.) Prevents other processes from changing all or part of the file. Performs a sequential read of a specified number of bytes from the current position and updates the position to the end of the read upon completion of the operation. (Inherited from the Stream class.) Performs the read of a single byte and updates the position by moving it by one. Identical to calling Read to read a single byte. (Inherited from the Stream class.) Sets the position within the stream. (Inherited from the Stream class.) Specifies the length of the stream. Will truncate the stream if the new length is less than the old length and will expand the stream if the reverse is true. (Inherited from the Stream class.) Allows other processes to change all or part of the underlying file. Writes information to the stream as a number of bytes and updates the current position to reflect the new write position. (Inherited from the Stream class.) Writes a single byte to the stream and updates the position. Identical to calling Write with a single byte. (Inherited from the Stream class.)
Lock Read
ReadByte
Seek SetLength
Unlock Write
WriteByte
Lesson 2: Reading and Writing Files
The StreamReader Class
The StreamReader class provides the basic functionality to read data from a Stream derived class. Table 2-22 and Table 2-23 show the most important StreamReader properties and methods, respectively.
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