How to Correctly Use LINQ to XML with XML Namespaces?

Use LINQ to XML to process XML namespaces

This article will explain how to avoid the problem of result differences caused by improper namespace handling when using LINQ to XML to process XML containing namespaces.

The first XML string contains a namespace declaration, while the second XML string does not. By default, LINQ to XML assumes the default namespace, but this doesn't match your XML structure.

In order to correctly use LINQ to XML to process XML containing the xmlns attribute, please follow the method below:

XDocument xmlElements = XDocument.Parse(theXml);

// 定义命名空间
XNamespace ns = "http://myvalue.com";
XNamespace nsa = "http://schemas.datacontract.org/2004/07/My.Namespace";

// 在引用元素时使用命名空间
var elements = from data in xmlElements.Descendants(ns + "Result")
               select new
               {
                   TheBool = (bool)data.Element(nsa + "TheBool"),
                   TheId = (int)data.Element(nsa + "TheId"),
               };

// 迭代结果
foreach (var element in elements)
{
    Console.WriteLine(element.TheBool);
    Console.WriteLine(element.TheId);
}

In this example, we define two namespaces ns and nsa, which correspond to the two namespaces in XML. When referencing elements in LINQ queries, we prepend these namespaces to the element name.

With this approach, LINQ to XML correctly identifies and accesses elements within the corresponding namespace, ensuring consistent and expected results no matter which XML string is used.

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