How to Customize Namespace Declarations When Serializing XML in .NET?

Customizing Namespace Declarations for Serialized XML in .NET

The challenge arises when attempting to serialize objects without generating excessive XML namespace declarations such as xsi and xsd. By default, serialization processes inject these namespaces into the resulting XML document.

Consider the following code snippet demonstrating the problem:

StringBuilder builder = new StringBuilder();
XmlWriterSettings settings = new XmlWriterSettings();
settings.OmitXmlDeclaration = true;
using (XmlWriter xmlWriter = XmlWriter.Create(builder, settings))
{
    XmlSerializer s = new XmlSerializer(objectToSerialize.GetType());
    s.Serialize(xmlWriter, objectToSerialize);
}

The resulting XML document will include namespace declarations:

<message xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" 
    xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" 
    xmlns="urn:something">
 ...
</message>

To eliminate these unnecessary namespace declarations, it is essential to employ customized namespace objects:

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

By utilizing the XmlSerializerNamespaces class and adding an empty string as the key and value, it is possible to override the default namespace declarations and produce the desired output:

<message>
 ...
</message>

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