How Can I Use an XmlNamespaceManager to Handle Default Namespaces in C# XPath Selectors?

Mastering Default Namespaces in C# XPath Selectors using XmlNamespaceManager

XPath queries on XML documents can be complicated by default namespaces. This article demonstrates how to effectively manage default namespaces using the XmlNamespaceManager class in C#, offering a superior alternative to using XPathNavigator directly.

Here's a practical example:

XmlElement el = ...; //TODO:  Obtain your XmlElement
XmlNamespaceManager nsmgr = new XmlNamespaceManager(el.OwnerDocument.NameTable);
nsmgr.AddNamespace("x", el.OwnerDocument.DocumentElement.NamespaceURI);
XmlNodeList nodes = el.SelectNodes(@"/x:outerelement/x:innerelement", nsmgr);

This code snippet initializes an XmlNamespaceManager, maps the prefix "x" to the default namespace URI of the document's root element, and then uses this manager with SelectNodes to retrieve the target nodes. This approach elegantly handles the default namespace within your XPath expressions.

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