Headers not being serialized correctly

Hello, thank you for bringing SOAP to .NET Core! I am having a problem with [XmlAttribute] and [XmlElement] not being honored when serializing headers. Let’s say I have the following MyInterface class:

[System.SerializableAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true, Namespace = "http://www.newtrade.com/expedia/R14/header")]
[System.Xml.Serialization.XmlRootAttribute(Namespace = "http://www.newtrade.com/expedia/R14/header", IsNullable = false)]
public class MyInterface
{
    private string nameField;
    private decimal versionField;

    [System.Xml.Serialization.XmlAttributeAttribute("Name")]
    public string Name
    {
        get { return this.nameField; }
        set { this.nameField = value;}
    }

    [System.Xml.Serialization.XmlElement("Version")]
    public decimal Version
    {
        get { return this.versionField; }
        set { this.versionField = value; }
    }
}

I am returning the same MyInterface object in a ResponseModel as both a header and a body:

[MessageContract(IsWrapped = false)]
public class ResponseModel
{
        [MessageHeader(Name = "MyInterface", Namespace = "http://www.newtrade.com/expedia/R14/header")]
        public MyInterface InterfaceAsHeader { get; set; }

        [MessageBodyMember(Name = "MyInterface", Namespace = "http://www.newtrade.com/expedia/R14/header")]
        public MyInterface InterfaceAsBody { get; set; }
}

This is the serialized result:

<s:Header>
    <MyInterface xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.newtrade.com/expedia/R14/header">
        <nameField xmlns = "http://schemas.datacontract.org/2004/07/MyContract" > ExpediaDirectConnect </ nameField >
        <versionField xmlns = "http://schemas.datacontract.org/2004/07/MyContract" > 0 </ versionField >
    </ MyInterface >
</ s:Header>
<s:Body>
    <MyInterface Name = "ExpediaDirectConnect" xmlns="http://www.newtrade.com/expedia/R14/header">
        < Version > 0 </ Version >
    </ MyInterface >
</ s:Body>

Note that in the header the element names are the private member names vs those specified in [XmlAttribute] and [XmlElement]. Also Name is being serialized as an element but it has been specified as an [XmlAttribute]. The body is perfect, though.

Can you shed some light on this for me, please? Thanks!

[mdailor]

BOOM! That was exactly what I needed, working perfectly now and thanks so much.

For anyone else who lands here, the class now looks like this:

public class MyInterface : IXmlSerializable
{
    public string Name { get; set; }

    public decimal Version { get; set; }

    public XmlSchema GetSchema() { return null; }
    public void ReadXml(XmlReader reader) { }
    public void WriteXml(XmlWriter writer)
    {
        writer.WriteAttributeString("Name", Name);
        writer.WriteAttributeString("Version", Version.ToString());
    }
}

and the output is:

<MyInterface Name = "ExpediaDirectConnect" Version="0">
</MyInterface>

[mdailor]

@kotovaleksandr That looks very promising, I will code it up and report back! Thank you!!