XML 反序列化为 xml 属性返回 null，但返回正确的 Xml 文本

Question

Below I have the following objects:

[XmlRoot("ExampleObject")]
public class ExampleObject
{
    [XmlElement("element1")]
    public long element1{ get; set; }

    [XmlElement("element2")]
    public string element2{ get; set; }

    [XmlElement("element3")]
    public string element3{ get; set; }

    [XmlElement("element4")]
    public ExampleObject2 element4{ get; set; }
}

[Serializable()]
public class ExampleObject2
{
    [XmlText]
    public string Value { get; set; }

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

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

and the following XML:

<c:ExampleObject>
   <c:element1>
        ...
   </c:element1>
   <c:element2>
          ...
   </c:element2>
   <c:element3>
          ...
   </c:element3>
   <c:element4 z:Ref="953" i:nil="true"/> <!--- or this <c:Status z:Id="953">...</c:element4> -->
</ExampleObject>

I am able to get my object perfectly fine, except for element4 where inside ExampleObject2 my Id and Ref are null while Value has the correct value inside.

I want it so that ExampleObject2 always has a Value , it is either null or the value it is supposed to has. I want Id and Ref to be the value of the attribute inside element4 depending on if element4 has that attribute or not.

I was wondering if there's something I am missing?

I have also tried to add specific names for the XMLElement tags like this [XmlAttribute("Id")] but that doesn't seem to do anything. I have also tried including the namespace like this [XmlAttribute("z:Id")] but that causes an error.

I have also tried putting IsNullable within the element4 XMLElement tag but for the XML elements that have nil="true" but it makes the entire ExampleObject2 null which isn't exactly what I am looking for.

I've already looked at the following question and have come to the same issue.

how to deserialize an xml node with a value and an attribute using asp.net serialization

Thank you

Answer 1

I ended up fixing it with the Nil property like @GeorgeBirbilis said and used it with @dbc's solution to manually naming the namespaces the z: and c: are from. I was only doing one or the other, not both combined. Thank you guys for the help.

[XmlAttribute(Namespace = "http://schemas.microsoft.com/2003/10/Serialization/")]
public int Id { get; set; }

[XmlAttribute(Namespace = "http://schemas.microsoft.com/2003/10/Serialization/")]
public int Ref { get; set; }

private bool _nil;

[XmlAttribute("nil", Namespace = "http://www.w3.org/2001/XMLSchema-instance")]
public bool Nil
{
    get
    {
        return _nil;
    }
    set
    {
        _nil = value;
    }
}