Wcf inhereted models - wcf

Question

[DataContract]
Base
{
[DataMember]
public int Id {get;set;}
}
[DataContract]
A : Base
{
[DataMember]
public string Value {get;set;}
}
[ServiceContract]
interface IService
{
[OperationContract]
void SetValue (Base base);
}
is there a way to use the service like the following style:
new Service ().SetValue (new A ());

Answer 1

You tagged this WCF so I assume you want to use it.
You need to connect to the endpoint using the ChannelFactory and then open the channel.
This will not work:
new Service ().SetValue (new A ());
You need to do smth. like this:
using (var scf = new ChannelFactory< IService >(<Binding>,<EndpointAddress>)
{
IService proxy = scf.CreateChannel();
proxy.SetValue(new (A));
}
This will return you a proxy object that implements the IService interface. You can call the SetValue on this object.

Answer 2

As well as changing the way you're calling the service as indicated by #Flo, you'll also need to make a small change to prepare the Data Contract Serializer to deal with the inheritance hierarchy.
The easiest way of doing this is decorating Base with the KnownTypeAttribute. Like this,
[DataContract]
[KnownType(typeof(A))]
Base
{
[DataMember]
public int Id {get;set;}
}
[DataContract]
A : Base
{
[DataMember]
public string Value {get;set;}
}