How to avoid writing a BOM when saving an XmlDocument to a file?

Question

I read XML from WCF and I need to save the XML to my disk but I get a BOM character when I save it. I don't want this character included, so I tried different ways to write the document without it, but it is not working, I don't know what is wrong. Any idea?

XmlDocument xmlDoc = new XmlDocument();

xmlDoc.LoadXml(vReply.xmlDocumento);

////-------------------------- Save without BOM ï»¿ -----------------------

var bytes = Encoding.UTF8.GetBytes(vReply.xmlDocumento);
var stream = new MemoryStream(bytes);

XmlWriterSettings settings = new XmlWriterSettings();
settings.Encoding = new UTF8Encoding(false); // The false means, do not emit the BOM.
using (XmlWriter w = XmlWriter.Create("c://temp/my.xml", settings))
{
    xmlDoc.Save(w);
}

Possible duplicate of [How can I remove the BOM from XmlTextWriter using C#?](https://stackoverflow.com/questions/1755958/how-can-i-remove-the-bom-from-xmltextwriter-using-c) — Sami Kuhmonen, Apr 10 '19 at 03:54
wcf is using http so you need to convert any http special character to/from their http values using System.Net.WebUtility.HtmlEncode(string) and System.Net.WebUtility.HtmlDecode(string). See Wiki : https://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references — jdweng, Apr 10 '19 at 08:59
I can't reproduce your problem, see https://dotnetfiddle.net/4VzxJd. The bytes written to the file do not contain a BOM, they correctly start with the bytes `60,63,120,109,108,32,118,101,114,115,105,111,110,61,34,49,46,48,34,32,101,110,99,111,100,105,110,103,61,34,117,116,102,45,56,34,63,62` which correspond to the XML declaration ``. Notice no BOM is included. Can you please [edit] your question to share a [mcve]? — dbc, Apr 10 '19 at 18:49
(Of course the bytes in the `MemoryStream stream` might contain a BOM since you did not write them using `UTF8Encoding(false)`. Only the file `"c://temp/my.xml"` should be written without the BOM.) — dbc, Apr 10 '19 at 18:50
@KlingCan that's not a BOM; that's xml preamble; a BOM would be 0xEFBBBF as the first 3 bytes of the file - you want `settings.OmitXmlDeclaration = true;` — Marc Gravell, May 22 '19 at 09:07

How to avoid writing a BOM when saving an XmlDocument to a file?

0 Answers0