Adding namespace to parent and child nodes in C# during xml serialization

Question

I'm serializing XML from a C# class, and I need to include a namespace in the root and child elements.

When I add a namespace from XmlSerializerNamespaces, it adds all of the namespaces to the root element.

I need to add some namespaces to the root as well as some to the Grouping1 Element.

Thanks

<root>
  <Element>
    <Grouping1>
      <Item1>First1</Item1>
      <Item2>Second1</Item2>
    </Grouping1>
    <Grouping2>
      <Item3>Third1</Item3>
    </Grouping2>
  </Element>
  <Element>
    <Grouping1>
      <Item1>First2</Item1>
      <Item2>Second2</Item2>
    </Grouping1>
    <Grouping2>
      <Item3>Third2</Item3>
    </Grouping2>
  </Element>
</root>

see stackoverflow.com/questions/35368858/… if true should be not important where the namespace — user13322060
– user13322060, Commented Sep 30, 2022 at 10:30

Afzal · Accepted Answer · 2022-10-07 03:57:39Z

Namespaces can be added to any XML element using XmlNamespaceDeclarations in a child class.

 [XmlNamespaceDeclarations]
 public XmlSerializerNamespaces xmlns = new XmlSerializerNamespaces(new[]{new XmlQualifiedName("sig", "urn:oasis:names:specification:ubl:schema:xsd:CommonSignatureComponents-2")});

Sample Code

[Serializable]
[XmlRoot(ElementName = "root")]
public class RootClass
{
    [XmlElement(ElementName = "body", Namespace = "httpenv")]
    public BodyClass body = new BodyClass();
}

[Serializable]
public class BodyClass
{
    [XmlElement(ElementName = "element", Namespace = "httpsos")]
    public SOSClass element = new SOSClass();
}

[Serializable]
public class SOSClass
{
    // This will be used by XML serializer to determine the namespaces
    [XmlNamespaceDeclarations]
    public XmlSerializerNamespaces xmlns = new XmlSerializerNamespaces( new[] { new XmlQualifiedName("sos", "httpsos"), });
}

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