XML add both a named and a default namespace error

Question

I want to create an XML file with two namespaces for my root element, one default and one named. Following is my code:

 var testdoc= new XDocument(
       new XDeclaration("1.0", "utf-8", "yes"),
       new XElement("Document",
            new XAttribute("xmlns", "namespace1"),
            new XAttribute(XNamespace.Xmlns + "xsi", "namespace2"),
            new XElement("sampleElem", "content")
       )
 );

This generates the following error:

the prefix for "namespace2" can not be redefined within the same code for starting a new element.

I understand the error, but I do not understand why I get it (as the prefix name is not the same). Anyone know the correct way to get the desired result?

Alexander Petrov · Accepted Answer · 2016-10-17 16:14:32Z

1

Because in this line new XElement("Document", you have already created an element with a namespace by default. Specifying the attribute you are trying to override it.

Do this

XNamespace ns = "namespace1";

var testdoc = new XDocument(
    new XDeclaration("1.0", "utf-8", "yes"),
    new XElement(ns + "Document",
        new XAttribute(XNamespace.Xmlns + "xsi", "namespace2"),
        new XElement("sampleElem", "content")
    )
);

answered Oct 17, 2016 at 16:14

Alexander Petrov

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