Extract common class with different XML namespaces

Question

I have two identical classes:

namespace Models.CSharpNamespace1
{
    [XmlType(Namespace = "http://XmlNamespace1")]
    public partial class TheClass
    {
        [XmlAttribute]
        public string Prop1 { get; set; }

        [XmlAttribute]
        public string Prop2 { get; set; }

        [XmlAttribute]
        public int Prop3 { get; set; }
    }
}

namespace Models.CSharpNamespace2
{
    [XmlType(Namespace = "http://XmlNamespace2")]
    public partial class TheClass
    {
        [XmlAttribute]
        public string Prop1 { get; set; }

        [XmlAttribute]
        public string Prop2 { get; set; }

        [XmlAttribute]
        public int Prop3 { get; set; }
    }
}

I would like to extract TheClass to Models.Common namespace to share it between Models.CSharpNamespace1 and Models.CSharpNamespace2, but there is a difference between them in namespace in XmlType attribute. This namespace is essential for SOAP, so I can't change it.

What to do?

Answer 1

Here is how to do it

POCO class (XmlTypeAttribute is removed)

public partial class TheClass
{
    [XmlAttribute]
    public string Prop1 { get; set; }

    [XmlAttribute]
    public string Prop2 { get; set; }

    [XmlAttribute]
    public int Prop3 { get; set; }
}

Serialization

public static void SerializeXml()
{
    TheClass obj = new TheClass()
    {
        Prop1 = "Prop1",
        Prop2 = "Prop2",
        Prop3 = 3
    };
    
    //--> Pass the Namespace programmatically here
    XmlSerializer s = new XmlSerializer(typeof(TheClass), "http://XmlNamespace2");
    
    XmlSerializerNamespaces namespaces = new XmlSerializerNamespaces();
    namespaces.Add(string.Empty, string.Empty); 
    XmlWriterSettings settings = new XmlWriterSettings
    {
        Indent = true,
        OmitXmlDeclaration = true
    };
    StringBuilder sb = new StringBuilder();
    TextWriter w = new StringWriter(sb);
    using (var writer = XmlWriter.Create(w, settings))
    {
        s.Serialize(writer, obj, namespaces);
    }       
    
    Console.WriteLine(sb.ToString());
}

Output:

<TheClass Prop1="Prop1" Prop2="Prop2" Prop3="3" xmlns="http://XmlNamespace2" />

Sample fiddle: https://dotnetfiddle.net/2ctFdk