When overridden in a derived class, obtains a decoder that converts an encoded sequence of bytes into a sequence of characters.
A System.Text.Decoder that converts an encoded sequence of bytes into a sequence of characters.
The Decoder.GetChars(Byte, int, int, Char, int) method converts sequential blocks of bytes into sequential blocks of characters, in a manner similar to the Encoding.GetChars(Byte) method of this class. However, a System.Text.Decoder maintains state information between calls so it correctly decodes byte sequences that span blocks. The System.Text.Decoder also preserves trailing bytes at the end of data blocks and uses the trailing bytes in the next decoding operation. Therefore, Encoding.GetDecoder and Encoding.GetEncoder are useful for network transmission and file operations, because those operations often deal with blocks of data instead of a complete data stream.