Inheritance problem?

Inheritance problem?

• nicope

  Greetings --

  Sorry for the delayed reply. I have tried to reproduce the problem on current WCF builds, but I have failed. As such, I'm hopeful that this has been fixed.

  I constructed a repro from the above code. It is below.

  using System;
  using System.Runtime.Serialization;
  using System.ServiceModel;
  
  namespace Prodigy.WorkPool
  {
    [ServiceContract(Name = "ServiceContract", Namespace = "Prodigy.WorkPool", Session = true, CallbackContract = typeof(ICallbackServiceContract))]
    public interface IServiceContract
    {
      [OperationContract]
      void NoopMethod();
    }
  
    [ServiceContract(Name = "CallbackServiceContract", Session = true, Namespace = "Prodigy.WorkPool")]
    public interface ICallbackServiceContract
    {
      [OperationContract(Name = "ServiceException", IsOneWay = true)]
      void ServiceException(Exception serviceException, string senderSessionId, int senderSeqNr);
    }
  }
  
  namespace Prodigy.PostalCode
  {
    [ServiceContract(Name = "GetDutchVersionServiceContract", Session = true, Namespace = "Prodigy.PostalCode", CallbackContract = typeof(ICallbackGetDutchVersionServiceContract))]
    public interface IGetDutchVersionServiceContract : Prodigy.WorkPool.IServiceContract
    {
      [OperationContract(Name = "GetDutchVersion", IsOneWay = true)]
      void GetDutchVersion(GetDutchVersionQuestionJobMessage message);
    }
  
    public interface ICallbackGetDutchVersionServiceContract : Prodigy.WorkPool.ICallbackServiceContract
    {
      [OperationContract(Name = "CallbackGetDutchVersion", IsOneWay = true)]
      void CallbackGetDutchVersion(GetDutchVersionReplyJobMessage message);
    }
  
    [ServiceContract(Name = "GetDutchAddressServiceContract", Session = true, Namespace = "Prodigy.PostalCode", CallbackContract = typeof(ICallbackGetDutchAddressServiceContract))]
    public interface IGetDutchAddressServiceContract /*: Prodigy.WorkPool.IServiceContract*/
    {
      [OperationContract(Name = "GetDutchAddress", IsOneWay = true)]
      void GetDutchAddress(GetDutchAddressQuestionJobMessage message);
    }
  
    public interface ICallbackGetDutchAddressServiceContract : Prodigy.WorkPool.ICallbackServiceContract
    {
      [OperationContract(Name = "CallbackGetDutchAddress", IsOneWay = true)]
      void CallbackGetDutchAddress(GetDutchAddressReplyJobMessage message);
    }
  
    public class PostalCodeService : IGetDutchAddressServiceContract, IGetDutchVersionServiceContract
    {
      public void GetDutchVersion(GetDutchVersionQuestionJobMessage message)
      {
        return;
      }
  
      public void GetDutchAddress(GetDutchAddressQuestionJobMessage message)
      {
        return;
      }
  
      public void NoopMethod()
      {
        return;
      }
    }
  
    [DataContract]
    public class GetDutchVersionQuestionJobMessage { }
  
    [DataContract]
    public class GetDutchVersionReplyJobMessage { }
  
    [DataContract]
    public class GetDutchAddressQuestionJobMessage { }
  
    [DataContract]
    public class GetDutchAddressReplyJobMessage { }
  
    public class Program
    {
      public static void Main(string[] args)
      {
        Uri uri = new Uri("net.tcp://localhost:8100/LocationService");
        ServiceHost PostalCodeHost = new ServiceHost(typeof(PostalCodeService), uri);
        PostalCodeHost.AddServiceEndpoint("Prodigy.PostalCode.IGetDutchAddressServiceContract", new NetTcpBinding(), "address");
        PostalCodeHost.AddServiceEndpoint("Prodigy.PostalCode.IGetDutchVersionServiceContract", new NetTcpBinding(), "version");
        PostalCodeHost.Open();
  
        Console.WriteLine("Service Started");
        Console.ReadLine();
      }
    }
  }
  

  I made a few changes -- some to make the code compile and some to remove extraneous info.

  First, I added a method to the base IServiceContract as we don't allow empty service contracts to be specified.

  Second, I added empty implementations of the messages.

  Third, I removed the [ServiceContract] attributes from callback contracts as they are not necessary (in fact, they are ignored).

  Lastly, I changed the AddServiceEndpoint(...) code to take a name instead of a type. Earlier CTPs will expect a type here (this is a recent change).

  If you can still repro this on current bits, please let me know.

  Thanks,

  -mike

  
  

• Alan Faux

  Ivo --
  
  Thanks for raising the question. Looking at the code, I don't see any errors. Could you post both IServiceContract and ICallbackServiceContract
  
  By the way, you should be aware that [ServiceContract] tags are unnecessary on the CallbackContract. In this scenario, they will be ignored.
  
  Cheers,
  -mike
  

• Radexx

  First of all thanks for the quick reply. I have added the code of both contracts below. I also tried rewriting the JobSessionId in the callbackcontract to an int, this didn't help anything though (JobSessionId is a datacontact with a few datamembers of normal types (int, string etc.).
  
  using System;< xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

  using System.ServiceModel;

  using System.Runtime.Serialization;

   

  namespace Prodigy.WorkPool

  {

    [ServiceContract(

     Name = "ServiceContract",

     Namespace = "Prodigy.WorkPool",

     Session = true,

     CallbackContract = typeof(ICallbackServiceContract))]

    public interface IServiceContract

    {

    }

   

    [ServiceContract(

     Name = "CallbackServiceContract",

     Session = true,

     Namespace = "Prodigy.WorkPool")]

    public interface ICallbackServiceContract

    {

      [OperationContract(Name = "ServiceException", IsOneWay = true)]
  

      [KnownType(typeof(System.ArgumentException))]

      [KnownType(typeof(System.ArgumentNullException))]

      void ServiceException(Exception serviceException, JobSessionId senderSessionId, int senderSeqNr);

    }

  }

  
  

• greenie

  Added findings: It seems to workf if I leave out the [OperationContract] in the callback. This means that you can only define a parent contract without OperationContract attribute's (which is kinda pointless). Is this a bug or intended

  Ivo Klerkx

  
  
• Inheritance problem?