XML Serialisation: what happens when an object reference is added?-CodePudding

I started with the following code:

public class ChangeRestartProcessing
{
    [XmlElement("ID")]
    public long TransportId { get; set; }

    [XmlElement("FI")]
    public Information FinalInformation { get; set; }
}

... and while serialising, everything worked fine: FI was visible in the XML serialisation result.

Now, I've made following modification:

public class ChangeRestartProcessing
{
    [XmlElement("ID")]
    public long TransportId { get; set; }

    [XmlElement("FI")]
    public Information FinalInformation { get; set; }

    [XmlElement("DI")]
    public Information NormalInformation { get; set; }
}

The idea is to see the FI when that object exists, and to see DI when that object exists (it never happens that both are present).

However, now I don't see any FI or DI tag in my XML serialisation result.

Is that normal and what can I do in order to make the mentioned tags visible? Do I need to create a separate class for both cases or is there another approach?

CodePudding user response：

Works fine here...

using System;
using System.Xml.Serialization;

var serializer = new XmlSerializer(typeof(ChangeRestartProcessing));
serializer.Serialize(Console.Out, // has ID FI only
    new ChangeRestartProcessing
    {
        FinalInformation = new() { Id = 42 },
    });
Console.WriteLine();
serializer.Serialize(Console.Out, // has ID DI only
    new ChangeRestartProcessing
    {
        NormalInformation = new() { Id = 42 },
    });

public class ChangeRestartProcessing
{
    [XmlElement("ID")]
    public long TransportId { get; set; }

    [XmlElement("FI")]
    public Information FinalInformation { get; set; }

    [XmlElement("DI")]
    public Information NormalInformation { get; set; }
}
public class Information
{
    [XmlAttribute]
    public int Id { get; set; }
}

output:

<?xml version="1.0" encoding="Codepage - 850"?>
<ChangeRestartProcessing xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <ID>0</ID>
  <FI Id="42" />
</ChangeRestartProcessing>
<?xml version="1.0" encoding="Codepage - 850"?>
<ChangeRestartProcessing xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <ID>0</ID>
  <DI Id="42" />
</ChangeRestartProcessing>