Sowvik Roy Sowvik Roy - 1 month ago 13
C# Question

Generate XML with multiple namespaces using XDocument

I have XML like this:

<stream:stream to="lap-020.abcd.co.in" from="sourav@lap-020.abcd.co.in" xml:lang="en" xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" version="1.0"/>


Try to generate the XML using
XDocument
like this

private readonly XNamespace _streamNamespace = "http://etherx.jabber.org/streams";
private readonly XName _stream;

_stream = _streamNamespace + "stream";

XDocument xdoc=new XDocument(
new XElement(_stream,
new XAttribute("from", "sourav@lap-020.abcd.co.in"),
new XAttribute("to","lap-020.abcd.co.in"),
new XAttribute("xmlns:stream","http://etherx.jabber.org/streams"),
new XAttribute("version","1.0"),
new XAttribute("xml:lang","en")
));


But I get an exception:


Additional information: The ':' character, hexadecimal value 0x3A, cannot be included in a name.

Answer

To add namespace declaration you can use XNamespace.Xmlns, and to reference the predefined namespace prefix xml use XNamespace.Xml, for example :

XNamespace stream = "http://etherx.jabber.org/streams";
var result = new XElement(stream + "stream",
                    new XAttribute("from", "sourav@lap-020.abcd.co.in"),
                    new XAttribute("to","lap-020.abcd.co.in"),
                    new XAttribute(XNamespace.Xmlns + "stream", stream),
                    new XAttribute("version","1.0"),
                    new XAttribute(XNamespace.Xml+"lang","en"),
                    String.Empty);
Console.WriteLine(result);
//above prints :
//<stream:stream from="sourav@lap-020.abcd.co.in" to="lap-020.abcd.co.in" 
//               xmlns:stream="http://etherx.jabber.org/streams" version="1.0" 
//               xml:lang="en">
//</stream:stream>