Пользовательские свойства сообщений в MessageDescription не поддерживаются. Используйте тип данных с добавлением MessageContract в операции "<var>X</var>", контракт"<var>Contract Name</var>".

Message in Russian (Русский)

Unlocalized message

Custom message properties in MessageDescription is not supported. Please use a MessageContract-decorated type in operation '<var>X</var>', contract '<var>Contract Name</var>'.

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