Why is my XDocument saving the declaration when I don't want it to?

Question

I have the following code:

class Program
{
    static void Main(string[] args)
    {
        using (var stream = File.Create(@\"C:\\test.xml\"))
        {
           


        

Answer 1

Instead XDocument.Save() you can use XmlWriter with XmlWriterSettings.OmitXmlDeclaration set to true

using System.IO;
using System.Xml;
using System.Xml.Linq;

XmlWriterSettings xws = new XmlWriterSettings();
xws.OmitXmlDeclaration = true;
xws.Indent = true;

using (var stream = File.Create(@"C:\test.xml"))
using (XmlWriter xw = XmlWriter.Create(stream, xws))
{
    var xml = new XElement(
        "root",
        new XElement("subelement1", "1"),
        new XElement("subelement2", "2"));

    xml.Save(xw);
}

Answer 2

You can do this using XmlWriter with a custom XmlWriterSettings (you'll need a using directive for System.Xml):

using System;
using System.IO;
using System.Xml;
using System.Xml.Linq;

class Program
{
    static void Main(string[] args)
    {
        var xml =
            new XElement("root",
                         new XElement("subelement1", "1"),
                         new XElement("subelement2", "2"));

        var doc = new XDocument(xml);
        var settings = new XmlWriterSettings
        {
            OmitXmlDeclaration = true
        };
        using (var stream = File.Create(@"test.xml"))
        {
            using (var writer = XmlWriter.Create(stream, settings))
            {
                doc.Save(writer);
            }
        }
    }
}

That's assuming you want to specify the Stream - you can also create an XmlWriter from the filename:

using (var writer = XmlWriter.Create("test.xml", settings))
{
    doc.Save(writer);
}

(If you don't need the XDocument for anything else, you can just call Save on the root element, of course, in the same way.)