我可以用多个接口组成一个WCF回调契约吗?

跟进问题至 How can I compose a WCF contract out of multiple interfaces? .

我试图在一个接口中合并多个回调接口。这将生成一个InvalidOperationException,声明最终接口不包含任何操作。从技术上讲,这是正确的,但是继承的接口确实包含操作。

我怎么修这个?或者这是WCF的限制?

编辑:

[ServiceContract]
// Using the following line instead would be no problem for me:
// [ServiceContract (CallbackContract = CallbackA)]
interface ServiceA { [OperationContract]void X(); }

[ServiceContract] // same here
interface ServiceB { [OperationContract]void Y(); }

interface CallbackA { [OperationContract]void CB_A() } // required in ServiceA
interface CallbackB { [OperationContract]void CB_B() } // required in ServiceB

interface CallbackC: CallbackA, CallbackB {} // composed callback contract

[ServiceContract (CallbackContract = CallbackC)]
interface ServiceC: ServiceA, ServiceB {} // composed service contract