wcf版本以实现向后兼容

Question

I have a service which has a following method:

[ServiceContract]
public interface TestContract
{
  [OperationContract]
  void GetTest(Test test);
}

Now in my new service contract Type Test has been moved to different namespace with new name TestNew This is my new service contract:

 public interface TestContract
{
  [OperationContract]
  void GetTest(TestNew test);
}

How do I implement the service without breaking the existing client. That means achieve backward compatibility without having the existing clients update their service references.

Basically, the type of the parameter changed, which is a breaking change. Since, I have both old and new client now. Is there any way I could change my service contract without having to change the service reference of both old and new client? I was thinking intercepting somewhere during the serialization/deserialization of parameter

Answer 1

You could define TestNow as a subclass (and KnownType of Test ) and not change the method signature, or you can add a new Action by either changing the name of the method (leaving the old) or using the Name property on the OperationContract attribute.

The more common approach for a breaking change is to just define a new endpoint. Eg: http://foo/someservice/2014-05 for the first version and http://foo/someservice/2015-10 for the new one.