题目内容

YouaredevelopingaWindowsCommunicationFoundation(WCF)servicethatcontainsthefollowingservicecontract.[ServiceContract()]publicinterfaceIPaymentService{[OperationContract()]voidRecordPayments(Personperson);}publicclassPerson{...}publicclassEmployee:Person{...}publicclassCustomer:Person{...}YouneedtoensurethatRecordPaymentscancorrectlydeserializeintoanEmployeeoraCustomerobject. Whatshouldyoudo?（）

AddthefollowingKnownTypeattributetotheEmployeeclassandtotheCustomerclass.[KnownType(GetType(Person))]
B. ImplementtheIExtensibleDataObjectinterfaceinthePersonclass.
C. ImplementtheIExtension(ofType(T))interfaceinthePersonclass.
D. AddthefollowingKnownTypeattributestothePersonclass.[KnownType(GetType(Employee))][KnownType(GetType(Customer))]

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