Create Text File Without BOM

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Well it writes the BOM because you are instructing it to, in the line

Encoding utf8WithoutBom = new UTF8Encoding(true);

true means that the BOM should be emitted, using

Encoding utf8WithoutBom = new UTF8Encoding(encoderShouldEmitUTF8Identifier: false);

writes no BOM.

My objective is create a file using UTF-8 as Encoding and 8859-1 as CharSet

Sadly, this is not possible, either you write UTF-8 or not. I.e. as long as the characters you are writing are present in ISO Latin-1 it will look like a ISO 8859-1 file, however as soon as you output a character that is not covered by ISO 8859-1 (e.g. ä,ö, ü) these characters will be written as a multibyte character.

To write true ISO-8859-1 use:

Encoding isoLatin1Encoding = Encoding.GetEncoding("ISO-8859-1");

Edit: After balexandre’s comment

I used the following code for testing …

var filePath = @"c:\temp\test.txt";
var sb = new StringBuilder();
sb.Append("dsfaskd jlsadfj laskjdflasjdf asdkfjalksjdf lkjdsfljas dddd jflasjdflkjasdlfkjasldfl asääääjdflkaslj d f");

Encoding isoLatin1Encoding = Encoding.GetEncoding("ISO-8859-1");

TextWriter tw = new StreamWriter(filePath, false, isoLatin1Encoding);
tw.WriteLine(sb.ToString());
tw.Close();

And the file looks perfectly well. Obviously, you should use the same encoding when reading the file.

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