How to Eliminate Namespace Attributes from XML Serialized Objects in .NET?

Eliminating Namespace Attributes during Object Serialization in .NET

When serializing an object to XML in .NET, it is common to encounter undesired namespace attributes in the resulting document, such as "xmlns:xsi" and "xmlns:xsd." These attributes can clutter the output and interfere with further processing.

One approach to remove these namespaces is to specify the XmlWriterSettings.OmitXmlDeclaration property as true. However, this method alone may not be sufficient, as it only suppresses the XML declaration line but not the namespace attributes.

To address this issue and explicitly remove the xsi and xsd namespaces, we can utilize the XmlSerializerNamespaces class. This class allows us to specify custom namespace mappings. In our case, we can create an instance of XmlSerializerNamespaces and add an empty string as both the key and value, effectively overriding any previously defined namespaces.

Code Example:

...
XmlSerializer s = new XmlSerializer(objectToSerialize.GetType());
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add("", "");
s.Serialize(xmlWriter, objectToSerialize, ns);

By specifying an empty string for both the key and value in XmlSerializerNamespaces, we remove all namespace declarations from the serialized XML document, resulting in a cleaner output with only the desired message tag:

<message>
...
</message>

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