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Determine a string's encoding in C#
Many text editorsr (like Notepad++) can detect encoding of arbitrary file. Can I detect encodoing of file in C#?
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Have you searched the web for examples of encoding detection in c#?Matt Ellen– Matt Ellen2010-09-19 16:39:26 +00:00Commented Sep 19, 2010 at 16:39
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duplicate of stackoverflow.com/questions/1025332/…Matt Ellen– Matt Ellen2010-09-19 16:40:34 +00:00Commented Sep 19, 2010 at 16:40
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1 Answer
A StreamReader will try to automatically detect the encoding of a file if there's a BOM when trying to read:
public class Program
{
static void Main(string[] args)
{
using (var reader = new StreamReader("foo.txt"))
{
// Make sure you read from the file or it won't be able
// to guess the encoding
var file = reader.ReadToEnd();
Console.WriteLine(reader.CurrentEncoding);
}
}
}
6 Comments
Jon Hanna
+1, though its worth adding that this is not foolproof; many encodings "look" the same to the simple detection method used. Even the best (which is used by the likes of google that can afford to do a lot of crunching and has lots of data to compare streams with) that will consider different possible meanings of "high" octets, aren't 100% perfect. If at all possible, it's best to convey this information precisely.
Tyler Liu
It works for common encodings, but not for all encodings.
Mark
StreamReader does NOT attempt to detect the encoding, it simply uses the default. See the very documentation you linked, where it says: "The default character encoding and default buffer size are used."
Giles
The MSDN documentation does say that the default character encoding will be used, but I've tried passing different BOMs to a StreamReader, and it correctly identified them (i.e. reader.CurrentEncoding returned the expected encoding). I tested with UTF-8, UTF-16-BE and UTF-16LE. Note @Darin's comment though - it won't work if you don't read some data.
tomexou
reader.Peek() is enough
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