How do I pass a string as XML document?

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When i tried to pass a string as an xml document using string writer i am geting invalid xml string.

what i expected is

<?xml version="1.0" encoding="utf-8" standalone="yes"?><data><child>myvalue</child></data>

But I am getting

<?xml version=\"1.0\" encoding=\"utf-16\" standalone=\"yes\"?><data><child>myvalue</child></data>

There is "\" charecter and its encoded as utf-16

What I have tried:

protected string BuildFindXmlSTR(string AgentName)
{
XmlWriterSettings setting = new XmlWriterSettings();
setting.Encoding = Encoding.UTF8;
string test = string.Empty;

StringBuilder sb = new StringBuilder();

using (StringWriter writer = new StringWriter(sb))
using (XmlWriter w = XmlWriter.Create(writer, setting))
{

w.WriteStartDocument(true);
w.WriteStartElement("data");

w.WriteElementString("child", "myvalue");

w.WriteEndElement();//data

}

test = sb.ToString();
return test;

}

Posted 30-Dec-19 9:19am

AnieMVC

Updated 30-Dec-19 10:00am

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[no name] 30-Dec-19 15:46pm

Please read this: Force XmlWriter or XmlTextWriter to use Encoding Other Than UTF-16 : C# 411[^]

And this seems also an interesting read: XmlWriterSettings.Encoding Property (System.Xml) | Microsoft Docs[^]

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Kris Lantz · Accepted Answer · 2019-12-30T10:00:00

StringWriter is going to force a UTF16 encoding, overwriting the XMLWriter utf8 setting. You'll need to tell SW that you only want a UTF8 encode. Again, take a look at Jon Skeet's answer here about subclassing the StringWriter's UTF encoding.
c# - XmlWriter to Write to a String Instead of to a File - Stack Overflow[^]

Edit: Quick and dirty mashup of Jon's example and your code. Does return utf-8.

C#

public class Utf8StringWriter : StringWriter
{
    public override Encoding Encoding
    {
        get { return Encoding.UTF8; }
    }
}

protected static string BuildFindXmlSTR(string AgentName)
{
    string test = string.Empty;

    using (TextWriter writer = new Utf8StringWriter())
    {
        using (XmlWriter w = XmlWriter.Create(writer))
        {
            w.WriteStartDocument(true);
            w.WriteStartElement("data");

            w.WriteElementString("child", "myvalue");

            w.WriteEndElement();//data
        }
        return writer.ToString();
    }
}