使用UTF8编码在C＃中创建XML

Question

I know that there is a lot of tutorials about this and even answered questions here, but I have problem I'm trying to resolve for hours and I read almost everything here, but this still remains mistery for me. Please help:

I'm creating XML, and it's created, but the problem is that encoding is UTF-16, and it should be UTF-8. This is what I tried so far, but still is UTF-16:

        var xmlText = new StringBuilder();

        using (var xml = XmlWriter.Create(xmlText))
        {
            xml.WriteStartDocument();
            xml.WriteStartElement("Weather");


            if (model.ModuleList[0] != null)
            {
                foreach (var weather in model.ModuleList)
                {
                    var AddProperty = new Action<XmlWriter, ModuleModel>((a, forc) =>
                    {
                        xml.WriteStartElement("Forecast");
                        a.WriteElementString("Description", forc.Description);
                        a.WriteElementString("Date", forc.Date.ToString());
                        a.WriteElementString("MinTemp", forc.Min_Temp.ToString());
                        a.WriteElementString("MaxTemp", forc.Max_Temp.ToString());
                        a.WriteElementString("Pressure", forc.Pressure.ToString());
                        a.WriteElementString("Humidity", forc.Humidity.ToString());                           
                        xml.WriteEndElement();
                    });
                    AddProperty(xml, weather);
                }
            }             

            xml.WriteEndElement();
            xml.WriteEndDocument();
        }
        var xmlresult = xmlText.ToString();

How to set encoding to my XML to UTF-8? Please help...

Answer 1

The result of your code is a string xmlresult - and strings do not have an encoding, they are always Unicode.

You use an encoding when you convert a string to a sequence of byte - so your problem is not in the piece of code you posted, but in the code you use to write that string to a file.

Something like this:

 using (StreamWriter writer = new StreamWriter(fileName, true, Encoding.UTF8))
 {
     writer.Write(xmlresult);
 }

will write a UTF-8 file - where filename contains the path of the file.

If you need UTF-8 encoded bytes in memory use:

var utf8Bytes = Encoding.UTF8.GetBytes("xmlresult");