How to create XML containing namespace declarations and prefixed names with an XmlDocument?

Question

I am struggling to output the following XML using the XmlDocument object in .NET. Any suggestions?

This is what I would like to output...

<l:config
    xmlns:l="urn:LonminFRConfig"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="urn:LonminFRConfig lonminFRConfigSchema.xsd">

</l:config>

The namespaces are really giving me a hard time!

Rubens Farias · Accepted Answer · 2009-10-14 14:53:28Z

2

Try this:

XmlDocument xmlDoc = new XmlDocument();
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("l", "urn:LonminFRConfig");
nsmgr.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");

XmlElement config = xmlDoc.CreateElement("l:config", nsmgr.LookupNamespace("l"));
XmlAttribute schemaLocation = xmlDoc.CreateAttribute(
    "xsi:schemaLocation", nsmgr.LookupNamespace("xsi"));
config.Attributes.Append(schemaLocation);
schemaLocation.Value = "urn:LonminFRConfig lonminFRConfigSchema.xsd";

xmlDoc.AppendChild(config);
xmlDoc.Save(Console.Out);

Good luck!

answered Oct 14, 2009 at 14:53

Rubens Farias

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2 Comments

AnthonyWJones Over a year ago

LookupNamespace is quite expensive when you need to create a lot of elements especially when creating from scratch where you already know all the aliases and namespaces you want to use.

Rubens Farias Over a year ago

@AnthonyWJones: ty for your info! I just read LookupNamespace implementation through reflector and saw it uses a Dictionary<> internally, so this is fast, but not faster than const string, of course =)

AnthonyWJones · Accepted Answer · 2009-10-14 19:15:56Z

0

Thi will do it.

const string lNS = "urn:lLominFRConfig";
const string xsiNS = "http://www.w3.org/2001/XMLSchema-instance";

var dom = new XmlDocument();

var configElem = dom.AppendChild(dom.CreateElement("l:config", lNS));

configElem.Attributes.Append(dom.CreateAttribute("xsi:schemaLocation", xsiNS))
    .Value = "urn:LonminFRConfig lonminFRConfigSchema.xsd";

edited Oct 14, 2009 at 19:15

answered Oct 14, 2009 at 14:58

AnthonyWJones

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5 Comments

John Saunders Over a year ago

-1: Anthony, I don't believe this will emit the namespace declarations.

Rubens Farias Over a year ago

@John: actually, it does; nsmgr.LookupNamespace() method returns a string, so this code is pretty equals mine

AnthonyWJones Over a year ago

@John: did you try it first? I did.

marc_s Over a year ago

@John: actually, when you run the code and fix the obvious typo (missing ";" on the var configElem = .... line), it does output the result as required by the question.

AnthonyWJones Over a year ago

@marc: good catch, originally configElem wasn't in my tested code it was all one line but I felt it just needed breaking up a bit once I had posted the answer.

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