Aggregating interfaces in C#

Question

I've got this class:

class UrlManagementServiceClient : System.ServiceModel.ClientBase<IUrlManagementService>, IUrlManagementService

ClientBase implements IDisposable and ICommunicationObject. I've also got this interface:

interface IUrlManagementProxy : IUrlManagementService, ICommunicationObject, IDisposable

But I can't cast UrlManagementServiceClient objects to IUrlManagementProxy. Is there some way to accomplish this? I want to end up with an object that can access all the methods on all three interfaces.

Answer 1

You can only cast to interfaces that you inherit from, to be able to cast to IUrlManagementProxy you need to implement that interface.

class UrlManagementServiceClient :
   System.ServiceModel.ClientBase<IUrlManagementService>, IUrlManagementProxy

You can then cast UrlManagementServiceClient to either UrlManagementProxy, IUrlManagementService, ICommunicationObject or IDisposable.

Edit
The WCF-generated classes are partial, that means that you can extend the class definition in another file. Put

public partial class UrlManagementServiceClient : IUrlManagementProxy {}

in another code file and your class will implement your full IUrlManagementProxy interface too and you can then cast it to IUrlManagementProxy.