لأن ServiceContract '<var>Contract Name</var>‎'‎ الأساس له CallbackContract 'X'، يجب على ServiceContract 'Y‎'‎ المنحدر أبضاً تحديد إما 'X' أو نوع منحدر كـ CallbackContract.

Message in Arabic (العربية)

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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