因为基本 ServiceContract“<var>Contract Name</var>”具有 CallbackContract“X”，派生的 ServiceContract“Y”也必须指定“X”或作为其 CallbackContract 的派生类型。

Message in Chinese (Simplified) (中文(简体))

Unlocalized message

Because base ServiceContract '<var>Contract Name</var>' has a CallbackContract 'X', derived ServiceContract 'Y' must also specify either 'X' or a derived type as its CallbackContract.

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