Avoid namespace for nested member xml serialisation

Question

Please, is any convenience way to avoid namespace attributes for nested member Request when serializing ResponseMessageEnvelope class? Result xml will not be used for deserialization.

[XmlInclude(typeof(AuthenticateRequest))]    
[XmlRoot("REQUEST",Namespace="")]
public abstract class BaseRequest
{
 ...
}

[XmlRoot("REQUEST", Namespace = "")]
public class AuthenticateRequest : BaseRequest
{
 ...
}

[XmlRoot("EXTSYSTEM", Namespace="")]
public class ResponseMessageEnvelope
{        
    public ResponseMessageEnvelope(BaseRequest request, BaseReponse response)
    {
        Request = request;
        Response = response;
    }

    [XmlElement("REQUEST", Namespace = "")]        
    public Request.BaseRequest Request
    {
        get;
        set;
    }

    public override string ToString()
    {
        StringBuilder sb = new StringBuilder();
        var ns = new XmlSerializerNamespaces();
        ns.Add("", "");

        using (XmlWriter sWriter = XmlWriter.Create(sb, new XmlWriterSettings() { OmitXmlDeclaration = true ,Indent = true }))
        {
            XmlSerializer serializer = new XmlSerializer(typeof(ResponseMessageEnvelope));
            serializer.Serialize(sWriter, this, ns);                
            return sb.ToString();
        }
    }    
}

I tried empty namespace for XmlRoot attribute on base and derived class, also for XmlElement on member but without success. Thanks for advice.

<EXTSYSTEM>
  <REQUEST xmlns:p2="http://www.w3.org/2001/XMLSchema-instance" p2:type="AuthenticateRequest">
  ...        
  </REQUEST>
....
</EXTSYSTEM>

This I would like to have:

<EXTSYSTEM>
  <REQUEST>
  ...        
  </REQUEST>
....
</EXTSYSTEM>

Dan Atkinson · Accepted Answer · 2018-07-04 14:26:17Z

1

The base class property must be decorated with the know types to avoid those declarations in the output. Change the request attribute inside ResponseMessageEnvelope to

[XmlElement("REQUEST")]
[XmlElement(Type = typeof(AuthenticateRequest))]
public Request.BaseRequest Request
{
    get;
    set;
}

Also Namespace = "" is not needed at the element/root level

edited Jul 4, 2018 at 14:26

Dan Atkinson

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answered Apr 21, 2015 at 16:42

XtremeBytes

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1 Comment

Jaroslav Kubacek Over a year ago

Yes, it's working fine for case that there is only one derived class (AuthenticateRequest ) but I have more like BetRequest, ResultRequest .... and all of them have to be serialised as REQUEST in default namespace. I can have same element names but different namespaces (several ELEMENT attributes like stackoverflow.com/questions/15455786/…) or different element name in one namespace (XmlInclude attribute). It give sense for deserialisation process. So thanks accepting as answer.

Jaroslav Kubacek · Accepted Answer · 2015-04-21 19:18:20Z

Finally I solve problem by XmlAttributeOverrides:

[Serializable()]   
public abstract class BaseRequest
{
...
}

[XmlRoot("EXTSYSTEM", Namespace="")]
public class ResponseMessageEnvelope
{

    [XmlElement("REQUEST")]
    public Request.BaseRequest Request
    {
        get;
        set;
    }

    public override string ToString()
    {
        StringBuilder sb = new StringBuilder();
        var ns = new XmlSerializerNamespaces();
        ns.Add("", "");

        XmlAttributeOverrides attrOverrides = new XmlAttributeOverrides();
        XmlAttributes attrs = new XmlAttributes();           

        XmlElementAttribute attr = new XmlElementAttribute();
        attr.ElementName = "REQUEST";
        attr.Type = this.Request.GetType();
        attr.Namespace = "";
        attrs.XmlElements.Add(attr);

        attrOverrides.Add(typeof(ResponseMessageEnvelope), "Request", attrs);

        using (XmlWriter sWriter = XmlWriter.Create(sb, new XmlWriterSettings() { OmitXmlDeclaration = true ,Indent = true }))
        {
            XmlSerializer serializer = new XmlSerializer(typeof(ResponseMessageEnvelope), attrOverrides);
            serializer.Serialize(sWriter, this, ns);                
            return sb.ToString();
        }
    }

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