Question

Add an attribute to an XmlElelement without a namespace.

Asked by: mromeo

I want to add an XmlElement to my XmlDocument. This element will also have an attribute. So I want to add something like the following to an existing xml document.

<MyNode attr="1">some value</MyNode>

Whenever I try to do this i end up with something like:
<MyNode p6:attr="1" xmlns:p6="http://www.mycompany.com/9/">some value</MyNode>

How do I get rid of the p6 and the xmlns:p6 namespace portion of this. I'm creating the node by doing:
        XmlElement newElem= document.CreateElement("MyNode", document.DocumentElement.NamespaceURI);
        XmlAttribute newAttr = document.CreateAttribute(attrName);
        newAttr.Value = "1";
        newElem.SetAttribute(newAttr);



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Asked On
2008-08-25 at 12:34:02ID23676347
Tags

Microsoft

,

.Net

,

C# / XML

Topics

.NET

,

Microsoft Visual C#.Net

,

.NET Framework 3.x versions

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: photowhizPosted on 2008-08-26 at 10:05:21ID: 22316933

You're adding the namespace with the document.DocumentElement.NamespaceURI parameter. If you don't want it, don't add it. Also, CreateElement will create a new element but does not add it to the document. Call document.AppendChild(newElem).

 

by: mromeoPosted on 2008-08-26 at 10:14:39ID: 22317021

Changing it to the following, didn't change anything:

XmlElement newElem= document.CreateElement("MyNode);
XmlAttribute newAttr = document.CreateAttribute(attrName);
newAttr.Value = "1";
newElem.SetAttribute(newAttr);
document.AppendChild(newElem);

I still get the namespace in my attribute.

 

by: photowhizPosted on 2008-08-26 at 11:09:19ID: 22317577

The code you posted does not give the output you posted; you're doing something you're not showing me. XmlDocument only adds namespaces when you specifically ask for them, you're adding it somewhere you're not showing me.

 

by: mromeoPosted on 2008-08-26 at 11:58:31ID: 22318114

Perhaps it has something to do with the schema, but I did solve it with the code I possted below. When i created the node and attribute this way, I didn't get the namespacing on the attribute. But I would still like to know what was causing the original problem.  This is the header of my XML document. Could this be culprit for my original problem?

<Config xmlns="http://www.mycompany.com/9/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mycompany.com/9/MyConfig.xsd">



//----------
// this code works --  no namespace references are added to my attribute
//----------
                // Create the new node
                XmlNode n = document.CreateNode(XmlNodeType.Element, name, String.Empty);
                n.InnerText = "MyNode";

                // create it's attribute
                XmlNode a = document.CreateNode(XmlNodeType.Attribute, attrName, String.Empty);
                a.Value = "true";

                // append the attribute.
                XmlElement node = (XmlElement)n;
                node.Attributes.Append((XmlAttribute)a);
                parentNode.AppendChild(node);

 

by: photowhizPosted on 2008-08-27 at 20:00:20ID: 22331064

Are you creating a new document or adding elements to an existing one? If you are adding to an existing document that has namespaces you have to define the namespace of each element. If you specify the same namespace as the containing element XmlDocument is smart enough to remove the xmlns attribute, but you have to match the containging document's namespace EXACTLY. Case counts. Assuming you want to add a child to the Config element you gave above:

var document = new XmlDocument();
document.Load(sourceDocument);
var newElem = document.CreateElement("MyNode", "http://www.mycompany.com/9/");
newElem.SetAttribute("attr", "1");
newElem.InnerText = "some value";
document.DocumentElement.AppendChild(newElem);
                                              
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by: mromeoPosted on 2008-08-29 at 12:23:36ID: 22348476

works perfectly...thanks!!

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