c# - Convert input file or stream to UTF8 and detect if it's UTF8 or not (asp.net) -

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what best way in c#/asp.net following: - detect if file reliably utf8 or not; - convert input stream or file on disk utf8 programmatically.

cheers askar

for checking if stream utf8 see: http://utf8checker.codeplex.com/

for converting can use streamreader:

new streamreader(stream, encoding.utf8))

in fact, using contructor prevents previous check, can use it.

msdn:

the character encoding set encoding parameter, , buffer size set 1024 bytes. streamreader object attempts detect encoding looking @ first 3 bytes of stream. automatically recognizes utf-8, little-endian unicode, , big-endian unicode text if file starts appropriate byte order marks. otherwise, user-provided encoding used. see encoding.getpreamble method more information.

if wish not detect little-endian unicode , big-endian unicode call following contructor:

new streamreader(stream, encoding.utf8, false))

the false turn off encoding detection, , call allways encode file using utf 8.


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