Так как базовый контракт ServiceContract "<var>Contract Name</var>" имеет CallbackContract "X", производный контракт ServiceContract "Y" также должен указывать в качестве CallbackContract "X" или производный тип.

Message in Russian (Русский)

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.

Search by Google

Available localized messages

Finnish (suomi) French (Français) German (Deutsch) Greek (Ελληνικά) Hebrew (עברית) Hungarian (magyar) Italian (Italiano) Japanese (日本語) Prior (Message) Korean (한국어) Arabic (العربية) Chinese (Simplified) (中文(简体)) Chinese (Traditional) (中文（繁體）) Czech (Čeština) Danish (Dansk) Dutch (Nederlands) Chinese (Simplified) (中文(简体)) Norwegian (Bokmal) (Norsk (Bokmål)) Next (Message) Polish (Polski) Portuguese (Brazil) (Português (Brasil)) Spanish (Español) Swedish (Svenska) Turkish (Türkçe) Chinese (Traditional) (中文（繁體）)