How Can I Efficiently Remove XML Namespace Declarations in C#?

Efficiently remove XML namespace declarations in C#

This article provides a comprehensive solution for removing namespace declarations from XML documents to simplify the structure or meet specific needs.

Question:

You want to remove all namespace declarations from the XML document to simplify its structure or meet specific requirements.

Interface:

<code class="language-csharp">public interface IXMLUtils
{
    string RemoveAllNamespaces(string xmlDocument);
}</code>

Example XML:

<code class="language-xml"><?xml version="1.0" encoding="utf-16"?><arrayofinserts xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><insert><offer xmlns="http://schema.peters.com/doc_353/1/Types">0174587</offer><type2 xmlns="http://schema.peters.com/doc_353/1/Types">014717</type2><supplier xmlns="http://schema.peters.com/doc_353/1/Types">019172</supplier><id_frame xmlns="http://schema.peters.com/doc_353/1/Types"></id_frame><type3 xmlns="http://schema.peters.com/doc_353/1/Types"><type2></type2><main>false</main></type3><status xmlns="http://schema.peters.com/doc_353/1/Types">Some state</status></insert></arrayofinserts></code>

Expected output:

<code class="language-xml"><?xml version="1.0" encoding="utf-16"?><arrayofinserts><insert><offer>0174587</offer><type2>014717</type2><supplier>019172</supplier><id_frame></id_frame><type3><type2></type2><main>false</main></type3><status>Some state</status></insert></arrayofinserts></code>

Solution:

You can use recursive functions to iterate over an XML document and remove namespaces from all elements. The function follows these steps:

1. For leaf elements (elements with no children), create a new element with the local name and value of the original element, and copy any attributes.
2. For elements with child elements, create a new element with the local name of the original element and call the function recursively for each child element.

The following is the C# implementation of the solution:

<code class="language-csharp">public static string RemoveAllNamespaces(string xmlDocument)
{
    XElement xmlDocumentWithoutNamespaces = RemoveAllNamespaces(XElement.Parse(xmlDocument));

    return xmlDocumentWithoutNamespaces.ToString();
}

private static XElement RemoveAllNamespaces(XElement xmlDocument)
{
    if (!xmlDocument.HasElements)
    {
        XElement xElement = new XElement(xmlDocument.Name.LocalName);
        xElement.Value = xmlDocument.Value;

        foreach (XAttribute attribute in xmlDocument.Attributes())
            xElement.Add(attribute);

        return xElement;
    }

    return new XElement(xmlDocument.Name.LocalName, xmlDocument.Elements().Select(el => RemoveAllNamespaces(el)));
}</code>

This solution is comprehensive and robust and can handle both leaf and non-leaf elements efficiently. It also preserves the original values ​​and attributes of XML elements, ensuring reliable and accurate namespace removal.

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