C# XMLTextWriter include default Namespaces

Question

How can I define a default namespace in XML using the XMLTextWriter?

I want my XML to look like this:

<myXml xmlns:nss="http://my/location/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://my/location/">

xmlTextWriter.WriteStartDocument();
xmlTextWriter.WriteStartElement("myXml");
xmlTextWriter.WriteAttributeString("xmlns", "nss", null, statusNamespace);
xmlTextWriter.WriteAttributeString("xmlns", "xsi", null, xsiSchemaNamespace);

How can I get the xmlns default without any prefix?

If I add the following line additionally, I get the prefix cannot be redefined from to "http://my/location/"

xmlTextWriter.WriteAttributeString("xmlns", null, null, statusNamespace);

WriteAttributeString(null, "xmlns", null, statusNamespace) ? — Nicolas Repiquet
– Nicolas Repiquet, Commented Feb 9, 2015 at 10:31
No, I still get the same error message! The prefix cannot be redefined with the same start element tag! — joesan
– joesan, Commented Feb 9, 2015 at 10:52

Damien_The_Unbeliever · Accepted Answer · 2015-02-09 12:02:46Z

1

You should generally prefer to use the overloads which accept namespaces directly, rather than manually trying to apply namespaces via attributes.

This code:

var myWriter = XmlTextWriter.Create("Blah1.xml");
myWriter.WriteStartDocument();
myWriter.WriteStartElement("myXml", "http://my/location/");
myWriter.WriteAttributeString("xmlns", "nss", null, "http://my/location/");
myWriter.WriteAttributeString("xmlns", "xsi", null,
         "http://www.w3.org/2001/XMLSchema-instance");
myWriter.Close();

Generates:

<?xml version="1.0" encoding="utf-8"?>
<myXml xmlns:nss="http://my/location/" 
mlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://my/location/" />

(With spaces added for readability)

answered Feb 9, 2015 at 12:02

Damien_The_Unbeliever

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