Атрибут CallbackBehaviorAttribute может запускаться только как поведение на конечной точке с дуплексным контрактом. Контракт "<var>Contract Name</var>" не является дуплексным, так как он не содержит операций обратного вызова.

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CallbackBehaviorAttribute can only be run as a behavior on an endpoint with a duplex contract. Contract '<var>Contract Name</var>' is not duplex, as it contains no callback operations.

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