C# Deserializing HttpResponseMessage to Object

Question

I'm having some problem deserializeing a HttpResponseMessage into an object. The problem is that when the object should have deserialized all fields are null, no exceptions are thrown.

HttpContent content = new StringContent(xml);
content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("text/xml");
HttpResponseMessage response = await client.PostAsync("URL", content).ConfigureAwait(false);
// Parse response
if (response.IsSuccessStatusCode)
{
    XmlSerializer serializer = new XmlSerializer(typeof(ResponseObject));
    Stream responseStream = await response.Content.ReadAsStreamAsync();
    ResponseObject responseObject = serializer.Deserialize(responseStream) as ResponseObject;

    //Possible example of wrong data
    Console.WriteLine(responseObject.Message);
}

[XmlRoot("response")]
public class ResponseObject
{
    [XmlElement("session")]
    public string Session { get; set; }

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

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

Response message as a string

"<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>
<response>
    <val n=\"session\">SESSION ID</val>
    <val n=\"status\">201</val>
    <val n=\"message\">Created</val>
</response>"

Have I missed something? I'm pretty new to serializing/deserializing. Grateful for pointers.

session,status and message are values of attribute n of tag val. — Eser
– Eser, Commented Aug 28, 2015 at 13:52
Does ResponseObject not require some collection of val elements in order to match the XML? — Biscuits
– Biscuits, Commented Aug 28, 2015 at 17:38
How stupid of me... That's what I get for trying to reuse code from an older project. I'll have a go at it on Monday when back at work. — Mattias
– Mattias, Commented Aug 29, 2015 at 14:45
Question: I have not had time to test anything yet but I have a question. I guess I should use a List<string> with XmlElement("val"). But how should I store the attribute for each xml row when it's beed serialized. I'd like to be able to find "session" in the list. Any hints? — Mattias
– Mattias, Commented Aug 30, 2015 at 15:47

Mattias · Accepted Answer · 2015-08-31 07:04:59Z

Okay I solved it with the help of Eser and Biscuits in the comments.

I was trying to reuse code and did't really think about the response message having a different structure then the earlier project.

I changed my ResponseObject to this:

[XmlRoot("response")]
public abstract class ResponseObject
{
    [XmlIgnore]
    public bool Success { get; set; }

    [XmlIgnore]
    public string Session
    {
        get
        {
            var result = Values.FirstOrDefault(n => n.Name == "session");
            return result.Value;
        }
    }

    [XmlIgnore]
    public string Status
    {
        get
        {
            var result = Values.FirstOrDefault(n => n.Name == "status");
            return result.Value;
        }
    }

    [XmlIgnore]
    public string Message
    {
        get
        {
            var result = Values.FirstOrDefault(n => n.Name == "message");
            return result.Value;
        }
    }

    [XmlElement("val")]
    public List<ResponseXmlWrapper<string>> Values;
}

public class ResponseXmlWrapper<T>
{
    [XmlAttribute("n")]
    [JsonProperty("n")]
    public string Name { get; set; }

    [XmlText]
    [JsonProperty()]
    public T Value { get; set; }

    public ResponseXmlWrapper()
    {

    }

    public ResponseXmlWrapper(string attributeName, T value)
    {
        Name = attributeName;
        Value = value;
    }
}

I don't know if this is an optimal solution but it works.

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