How can I write xml with a namespace and prefix with XElement?

Question

This may be a beginner xml question, but how can I generate an xml document that looks like the following?

Answer 1

Try this code:

string prefix = element.GetPrefixOfNamespace(element.Name.NamespaceName);
string name = String.Format(prefix == null ? "{1}" : "{0}:{1}", prefix, element.Name.LocalName);`

Answer 2

I hope you will get some useful information from this thread - XElement default namespace on attributes provides unexpected behaviour

EDIT:

Another FAQ at - http://social.msdn.microsoft.com/Forums/en-US/xmlandnetfx/thread/c0648840-e389-49be-a3d2-4d5db17b8ffffd

Answer 3

Here is a small example that creates the output you want:

using System;
using System.Xml.Linq;

class Program
{
    static void Main()
    {
        XNamespace ci = "http://somewhere.com";
        XNamespace ca = "http://somewhereelse.com";

        XElement element = new XElement("root",
            new XAttribute(XNamespace.Xmlns + "ci", ci),
            new XAttribute(XNamespace.Xmlns + "ca", ca),
                new XElement(ci + "field1", "test"),
                new XElement(ca + "field2", "another test"));
    }
}

Answer 4

XNamespace ci = "http://somewhere.com";
XNamespace ca = "http://somewhereelse.com";
XElement root = new XElement(aw + "root",
    new XAttribute(XNamespace.Xmlns + "ci", "http://somewhere.com"),
    new XAttribute(XNamespace.Xmlns + "ca", "http://somewhereelse.com"),
    new XElement(ci + "field1", "test"),
    new XElement(ca + "field2", "another test")
);
Console.WriteLine(root);

This should output

<root xmlns:ci="http://somewhere.com" xmlns:ca="http://somewhereelse.com">
    <ci:field1>test</ci:field1>
    <ca:field2>another test</ca:field2>
</root>

Answer 5

For XmlDocument it's similar:

XmlAttribute attribute1 = sessionXml.CreateAttribute("s", "Attribute1", namespaceURI);
XmlAttribute attribute2 = sessionXml.CreateAttribute("s", "Attribute2", namespaceURI);
XmlAttribute attribute3 = sessionXml.CreateAttribute("s", "Attribute3", namespaceURI);
XmlAttribute attribute4 = sessionXml.CreateAttribute("s", "Attribute4", namespaceURI);