Azure Service Bus Queue - Serialization with BrokeredMessage - azure

Question

Trying to submit a queue message with an object in the message body but receiving exception on the following line with BrokeredMessage
QueueClient queueClient = QueueClient.CreateFromConnectionString(_connectionString, _queuePathName);
var data = new ABSurvey
{
name = "somename",
version = 1,
language = "eng",
SelfSurvey = new Survey()
{
SurveyItems = new List<ISurveyItem>() { new SurveyItem(){IsSelected = true, ItemId = 1}},
SurveyPerception = Constants.Perception.Self
},
SelfConcept = new Survey()
{
SurveyItems = new List<ISurveyItem>() { new SurveyItem(){IsSelected = true, ItemId = 1}},
SurveyPerception = Constants.Perception.SelfConcept
}
};
BrokeredMessage message = new BrokeredMessage(data);
queueClient.Send(message);
Exception Message - Type '.Survey' with data contract name 'Survey:http://schemas.datacontract.org/2004/07/namespace' is not expected. Consider using a DataContractResolver or add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer.
These are the models I have -
[DataContract]
public class ABSurvey
{
[DataMember] public string name;
[DataMember] public int version;
[DataMember] public string language;
[DataMember] public ISurvey SelfSurvey;
[DataMember] public ISurvey SelfConcept;
}
[DataContract]
public class SurveyItem : ISurveyItem
{
[DataMember]
public int ItemId { get; set; }
[DataMember]
public bool IsSelected { get; set; }
public SurveyItem()
{
ItemId = -1;
IsSelected = false;
}
}
[DataContract]
public class Survey : ISurvey
{
[DataMember]
public IList<ISurveyItem> SurveyItems { get; set; }
[DataMember]
public Constants.Perception SurveyPerception { get; set; }
public Survey()
{
SurveyItems = new List<ISurveyItem>();
}
}
public interface ISurvey
{
[DataMember]
IList<ISurveyItem> SurveyItems { get; set; }
[DataMember]
Constants.Perception SurveyPerception { get; set; }
}
public interface ISurveyItem
{
[DataMember]
int ItemId { get; set; }
[DataMember]
bool IsSelected { get; set; }
}
Please help locate the issues.

Answer 1

You are missing [KnownType] attributes on your data contract and that is why your message can't be serialized. Detailed explanation can be found hehe.
Simply add [KnownType] attributes to tell serializer which concrete implementation can be used:
[KnownType(typeof(Survey))]
[DataContract]
public class ABSurvey
{
[DataMember]
public string name;
[DataMember]
public int version;
[DataMember]
public string language;
[DataMember]
public ISurvey SelfSurvey;
[DataMember]
public ISurvey SelfConcept;
}
[KnownType(typeof(SurveyItem))]
[DataContract]
public class Survey : ISurvey
{
[DataMember]
public IList<ISurveyItem> SurveyItems { get; set; }
public Survey()
{
SurveyItems = new List<ISurveyItem>();
}
}