Writing data Open the stream While more data exists Write the data Close the stream Reading data in .NET

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Writing data Open the stream While more data exists Write the data Close the stream Reading data
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Streams, File Access, and Serialization
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Open the stream While more data exists Read the data Process the data Close the stream
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The .NET Framework provides stream classes, which are classes that derive from System.IO.Stream, and helper classes, which are wrapper classes that use a stream and provide additional methods to simplify stream access. The helper classes are typically called reader and writer classes. Figure 10.1 shows the relationship between the stream and reader/writer classes.
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Stream
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The Stream class is an abstract base class for all stream classes. The constructor for this class is protected, which means that it is not possible to create a new instance of this class. The Stream class members are shown in Table 10.1. The Stream class has a Close method, which releases all resourses, such as file handles and windows sockets. The opening of the stream is accomplished in the constructor of the Stream class. Using one of the available streams helps to isolate the programmer from the low-level operating system and device details. All stream classes handle the movement of binary data using bytes or byte arrays. The System.Text.Encoding class provides routines for converting bytes and byte arrays to and from Unicode text.
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Stream Helpers
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BinaryWriter TextReader BinaryReader TextWriter
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StreamReader
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StringReader
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Stream
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BufferedStream
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FileStream
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CryptoStream
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NetworkStream
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Figure 10.1 Stream class children and stream helper classes.
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10
Table 10.1 Stream Properties and Methods DESCRIPTION A static property that can be used to send data to the bit bucket. Use this when a stream is required, but there is no desire to actually move data. Returns a Boolean, indicating whether the stream can be read. This is an abstract method that must be overridden. Returns a Boolean, indicating whether this stream supports seeking. This is an abstract method that must be overridden. Returns a Boolean, indicating whether this stream can be written to. This is an abstract method that must be overridden. Returns a Long, indicating the length of the stream. This is an abstract method that must be overridden. This changeable property can be used to get or set the position within the stream. The stream must support seeking to use this property. This is an abstract method that must be overridden. Starts an asynchronous read from the stream. Starts an asynchronous write from the stream. Closes the stream. This method will also flush all data that is buffered. All resources, including file and socket handles will be released. Called to wait for a pending asynchronous read operation to complete. Called to wait for a pending asynchronous write operation to complete. Forces the movement of any data that is in memory to its destination. This is an abstract method that must be overridden. If the stream supports reading, this method is used to retrieve a sequence of bytes from the stream and update the position within the stream. This is an abstract method that must be overridden. If the stream supports reading, this method is used to read a single byte from a stream and update the position within the stream.
STREAM MEMBER Null
CanRead CanSeek
CanWrite
Length Position
BeginRead BeginWrite Close
EndRead EndWrite Flush
Read
ReadByte
Streams, File Access, and Serialization
Table 10.1 (continued) DESCRIPTION This method is used to set the position within the stream. The stream must support seeking to execute this method. This method requires an offset and a relative origin. The relative origin can be Begin, Current, or End. This is an abstract method that must be overridden. If the stream supports writing and seeking, this method can be used to expand or truncate the current stream. This is an abstract method that must be overridden. If the stream supports writing, this writes a sequence of bytes to the current stream and advances the position. This is an abstract method that must be overridden. If the stream supports writing, this method writes a byte to the current stream and advances the position.
STREAM MEMBER Seek
SetLength
Write
WriteByte
FileStream
The FileStream class provides the ability to move data to and from a disk file. This class inherits all the methods in the Stream class and has additional filecentric properties and methods.