Question

I am developing a RESTful webservice using WCF. I would like to have a ServiceContract interface that all my services implement, however, I would also like each service to aditionally implement their own methods.

In my Global.asax file I initialize the service routes:

RouteTable.Routes.Add(new ServiceRoute("iOSAppService", new WebServiceHostFactory(), typeof(Service.iOSAppService)));
RouteTable.Routes.Add(new ServiceRoute("AndroidAppService", new WebServiceHostFactory(), typeof(Service.AndroidAppService)));
RouteTable.Routes.Add(new ServiceRoute("WindowsPhoneAppService", new WebServiceHostFactory(), typeof(Service.WindowsPhoneAppService)));

Each of the services must implement the IAppService interface:

[ServiceContract]
public interface IAppService

Which is implemented as follows:

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
public class iOSAppService : IAppService

However, I would for instance also like the iOSAppService to implement the IiOSApService interface:

[ServiceContract]
public interface IiOSAppService

Thus resulting in the implementation:

public class iOSAppService : IAppService, IiOSAppService

However, this results in the following exception:

Service ‘iOSAppService’ implements multiple ServiceContract types, and no endpoints are defined in the configuration file. WebServiceHost can set up default endpoints, but only if the service implements only a single ServiceContract. Either change the service to only implement a single ServiceContract, or else define endpoints for the service explicitly in the configuration file.

Does anyone know how I can achieve my goal?

Answer 1

Make your specyfic interface like this:

[ServiceContract]
public interface IiOSAppService : IAppService

And then

public class iOSAppService : IiOSAppService

Edit:

On service side make sure you have:

<system.serviceModel>
  <services>
    <service name="YourNamespace.iOSAppService">
      <endpoint binding="webHttpBinding" contract="YourNamespace.IiOSAppService" behaviorConfiguration="web">
      </endpoint>
    </service>
  </services>
  <behaviors>
    <endpointBehaviors>
      <behavior name="web">
        <webHttp />
      </behavior>
    </endpointBehaviors>
  </behaviors>
</system.serviceModel>