How to Correctly Parse XML with Namespaces Using LINQ to XML?

Handling XML namespaces in LINQ to XML

When processing XML data that contains namespaces, proper handling of namespaces is critical to retrieving and manipulating the required elements. Here's how to use LINQ to XML to traverse XML containing namespaces:

Sample code provided:

<code class="language-csharp">string theXml = @"<Response xmlns=""http://myvalue.com""><Result xmlns:a=""http://schemas.datacontract.org/2004/07/My.Namespace"" xmlns:i=""http://www.w3.org/2001/XMLSchema-instance""><a:TheBool>true</a:TheBool><a:TheId>1</a:TheId></Result></Response>";

XDocument xmlElements = XDocument.Parse(theXml);

var elements = from data in xmlElements.Descendants("Result")
               select new {
                            TheBool = (bool)data.Element("TheBool"),
                            TheId = (int)data.Element("TheId"),
                          };</code>

This code does not parse the XML correctly when namespaces are used in the XML string, resulting in null values. To solve this problem, we need to explicitly specify the XML namespace in the LINQ query.

To define an XML namespace in a LINQ query, you can use the XNamespace object. This object allows you to create XName instances with the appropriate namespace prefix and URI.

The following is the corrected code:

<code class="language-csharp">string theXml = @"<Response xmlns=""http://myvalue.com""><Result xmlns:a=""http://schemas.datacontract.org/2004/07/My.Namespace"" xmlns:i=""http://www.w3.org/2001/XMLSchema-instance""><a:TheBool>true</a:TheBool><a:TheId>1</a:TheId></Result></Response>";

XDocument xmlElements = XDocument.Parse(theXml);
XNamespace ns = "http://myvalue.com";
XNamespace nsa = "http://schemas.datacontract.org/2004/07/My.Namespace";
var elements = from data in xmlElements.Descendants(ns + "Result")
              select new
              {
                  TheBool = (bool)data.Element(nsa + "TheBool"),
                  TheId = (int)data.Element(nsa + "TheId"),
              };</code>

In the corrected code, we first declare the XNamespace objects ns and nsa using namespace URIs. Then, in the Descendants and Element queries, we specify XName with the namespace prefix. In this way, LINQ to XML can correctly identify and access elements in the specified namespace.

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