Wrong deserialization while using object as type (returns null) about yaxlib

[asbjornu]

Why are you using typeof(object) and not typeof(Speicherstand)? Ok, saw your edit now. You need to identify the type and send it over the network, somehow. Most HTTP frameworks do this through a custom header (like RavenDB's Raven-Clr-Type) or through a custom Content-Type (like Content-Type: vnd.company-x/speicherstand+xml). If you don't tell Yax what type it's supposed to deserialize, how is it going to know?

[weini37]

Hello, thanks for the comment.
I cant use typeof(Speicherstand), because the api i wrote does not know what the object type is.
I wrote a method which basically receives a message containing a xml serialized with yaxlib. then the method deserializes the xml to a object. after that in the caller method i could simply cast it to the given object it needs to be.

The problem is here, that the serialization comes from over the network so basically i dont know which object it is. e.g. "Speicherstand" or "quit" or something like that.

[Nadynho]

Yes, but then how should the deserializer interpret the meta of object type? Object is not enough..., at least an interface would be nice....

On Friday, November 7, 2014 4:40 PM, Michael Weinberger [email protected] wrote:

Hello, thanks for the comment.
I cant use typeof(Speicherstand), because the api i wrote does not know what the object type is.
I wrote a method which basically receives a message containing a xml serialized with yaxlib. then the method deserializes the xml to a object. after that in the caller method i could simply cast it to the given object it needs to be.
—
Reply to this email directly or view it on GitHub.

[weini37]

Object is not enough.

Why does the serializer then writes in the first tag: yaxlib:realtype=\"WpfApplication2.Speicherstand\"?
Should not it detect it then afterwards again and create one via the properties?

[304NotModified]

I think is a feature request.

[axunonb]

Expressing this issue in code and conclude:
XML can only be deserialized to a specific class, when

• the serializer instance is created for this class, OR
• the serializer is created for typeof(object), but the XML contains the yaxlib:realtype attribute.

namespace YAXLibTests;
public class Issue31SampleClass
{
    public string Username { get; set; }
    public int Granny { get; set; }
    public int Factory { get; set; }
    public int Farm { get; set; }
    public int Mine { get; set; }
    public int Cursor { get; set; }
}

[TestFixture]
public class Issue_31
{
    [Test]
    public void DeSerialize()
    {
        var original = new Issue31SampleClass { Cursor = 1, Factory = 2, Farm = 3, Granny = 4, Mine = 5 };
        var s = new YAXSerializer(typeof(object));
        var xml = s.Serialize(original);
/*
<Object yaxlib:realtype="YAXLibTests.Issue31SampleClass" xmlns:yaxlib="http://www.sinairv.com/yaxlib/">
  <Username />
  <Granny>4</Granny>
  <Factory>2</Factory>
  <Farm>3</Farm>
  <Mine>5</Mine>
  <Cursor>1</Cursor>
</Object>
 */
        var deserialized = (Issue31SampleClass) s.Deserialize(xml);
        deserialized.Should().BeEquivalentTo(original);

        var xmlWithOutRealType =
            xml.Replace(
                "<Object yaxlib:realtype=\"YAXLibTests.Issue31SampleClass\" xmlns:yaxlib=\"http://www.sinairv.com/yaxlib/\">",
                "<Object>");

        // Create a new serializer instance!
        s = new YAXSerializer(typeof(object));
        Assert.That(() =>
        {
            // The serializer cannot guess which type to create
            _ = (Issue31SampleClass) s.Deserialize(xmlWithOutRealType);
        }, Throws.TypeOf(typeof(InvalidCastException)));
    }
}