StreamReader Constructor (Stream, Encoding, Boolean, Int32)
Initializes a new instance of the StreamReader class for the specified stream, with the specified character encoding, byte order mark detection option, and buffer size.
Assemblies: mscorlib (in mscorlib.dll)
System.IO (in System.IO.dll)
new : stream:Stream * encoding:Encoding * detectEncodingFromByteOrderMarks:bool * bufferSize:int -> StreamReader
- Type: System.IO.Stream
The stream to be read.
- Type: System.Text.Encoding
The character encoding to use.
- Type: System.Boolean
Indicates whether to look for byte order marks at the beginning of the file.
- Type: System.Int32
The minimum buffer size.
The buffer size, in number of 16-bit characters, is set by the bufferSize parameter. If bufferSize is less than the minimum allowable size (128 characters), the minimum allowable size is used.
This constructor allows you to change the encoding the first time you read from the StreamReader object. The detectEncodingFromByteOrderMarks parameter detects the encoding by looking at the first three bytes of the stream. It automatically recognizes UTF-8, little-endian Unicode, and big-endian Unicode text if the file starts with the appropriate byte order marks. Otherwise, the user-provided encoding is used. See the Encoding.GetPreamble method for more information.
When reading from a Stream, it is more efficient to use a buffer that is the same size as the internal buffer of the stream.
When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.
For a list of common I/O tasks, see Common I/O Tasks.