XML
Topic: Select a node from an XML document what has a namespace specified (using System.Xml.XmlNamespaceManager).
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Posted by Paschal on

Several weeks ago, I needed to query a node in a XML document where a namespace was specified in the the document. Consider the following XML document.

xml version ="1.0" encoding ="utf-8" ?>
   < Author xmlns : xsd ="http://www.w3.org/2001/XMLSchema" xmlns : xsi = http://www.w3.org/2001/XMLSchema-instance xmlns ="http://tempuri.org/MyAuthors">
      < ContactInformation >
         < FirstName > John FirstName >
         < LastName > Doe LastName >
         < Address > 100 Nowhere Address >
         < City > Gnome City >
         < State > Alaska State >
         < PostalCode > PostalCode >
       ContactInformation >
       < Books >
         < Title > What is your favorite color? Title >
         < DatePublished > Jan 1, 1886 DatePublished >
         < NoOfPages > 16966 NoOfPages >
       Books >
   Author >

In order to select any the nodes, you would use the following code.

System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
doc.Load("c:\authors.xml");

System.Xml.XmlNamespaceManager manager = new System.Xml.XmlNamespaceManager(doc.NameTable);

manager.AddNamespace("ns", http://tempuri.org/MyAuthors );

string  lastName = doc.SelectSingleNode("/ns:Author/ns:ContactInformation/ns:LastName", manager).InnerText;

It's pretty simple.

See Also:
System.Xml.XmlNamespaceManager Class
System.Xml.XmlDocument