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By	Sonu Kapoor
First Posted	02/20/2005
Times viewed	1262

How to select specific nodes in XmlDocument() when having a namespace ?

Summary How to select specific nodes in XmlDocument() when having a namespace in the XML?

You can not simple use the SelectNodes or SelectSingleNode function to retrieve specific nodes if you have a namespace in your XML file. If you still do, you will get the following error:


System.NullReferenceException: 
Object reference not set to an instance of an object.

To get rid of that still get the nodes, you will have to use the XmlNameSpaceManager and add the namespace to the XmlDocument object. In this example you will see how you can achieve that. I am using the following XML file for the example. Note the namespace at the beginning of the file.

Output:

VC++

Additional information
<%@ import namespace="System.Xml" %> <%@ page language="C#" debug="true"%> <script runat="server"> void page_load(object sender, System.EventArgs e){ // Create a new XmlDocument object XmlDocument xmlDoc = new XmlDocument(); // Load the xml file into the object xmlDoc.Load(Server.MapPath("XmlDocumentWithSelectNodesAndNamespace.xml")); // Create a namespace manager and pass the NameTable of XmlDocument XmlNamespaceManager nsmRequest = new XmlNamespaceManager(xmlDoc.NameTable); // Add the namespace as in our xml file nsmRequest.AddNamespace("ns", "http://localhost/CategorySchema.xsd"); // Select the nodes with our prefix before each node XmlNode node; node = xmlDoc.SelectSingleNode("/ns:CategoryList/ns:Category/ns:MainCategory[@ID='0'~", nsmRequest); // Check whether we have found any data if(node != null) { // Printout the value of the node Response.Write(node.InnerXml); } else Response.Write("Sorry no data found!"); } </script>

Further additional information
<?xml version="1.0" encoding="utf-8"?> <CategoryList xmlns="http://localhost/CategorySchema.xsd"> <Category> <MainCategory ID="0">VC++</MainCategory> <Description>VC++ Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="1">XML</MainCategory> <Description>XML Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="2">XSL</MainCategory> <Description>XSL Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="3">XPath</MainCategory> <Description>XPath Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="4">XQuery</MainCategory> <Description>XQuery Articles</Description> <Active>Yes</Active> </Category> </CategoryList>

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