c# - When saving an XmlDocument, it ignores the encoding in the XmlDeclaration (UTF8) and uses UTF16

Question

i have the following code:

var doc = new XmlDocument();

XmlDeclaration xmlDeclaration = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
doc.AppendChild(xmlDeclaration);

XmlElement root = doc.CreateElement("myRoot");
doc.AppendChild(root);
root.InnerText = "myInnerText";

StringWriter sw = new StringWriter();
doc.Save(sw);
Console.WriteLine(sw.ToString());

Console.WriteLine();

MemoryStream ms = new MemoryStream();
doc.Save(ms);
Console.WriteLine(Encoding.ASCII.GetString(ms.ToArray()));

And here is the output:

<?xml version="1.0" encoding="utf-16"?>
<myRoot>myInnerText</myRoot>

???<?xml version="1.0" encoding="UTF-8"?>
<myRoot>myInnerText</myRoot>

Basically what it does is make an xml file, and set the encoding to utf8, but when it saves it to stringwriter it ignores my encoding and uses utf16. However, when using a memory stream, it uses utf8 (with the extra BOM chars)

Why is this? Why isn't it honouring my explicit encoding setting of utf-8?

Thanks a lot

Answer 1

Because all you are doing is setting an XML element that says it's UTF-8, you aren't actually saving it as UTF-8. You need to set the output stream to use UTF-8, like this:

var doc = new XmlDocument();
XmlElement root = doc.CreateElement("myRoot");
doc.AppendChild(root);
root.InnerText = "myInnerText";
using(TextWriter sw = new StreamWriter("C:\output.txt", false, Encoding.UTF8)) //Set encoding
{
    doc.Save(sw);
}

Once you do that, you don't even have to add the XML declaration. It figures it out on its own. If you want to save it to a MemoryStream, use a StreamWriter that wraps the MemoryStream.