单项选择题
A Windows Communication Foundation （WCF） service has a callback contract. You are developing a client application that will call this service. You must ensure that the client application can interact with the WCF service. What should you do？ （）
A. On the OperationContractAttribute， set the AsyncPattern property value to True.
B. On the OperationContractAttribute， set the ReplyAction property value to the endpoint address of the client. For interactive and self-paced preparation of exam 70-513， try our practice exams. Practice exams also include self assessment and reporting features!
C. On the client， create a proxy derived from DuplexClientBase（Of TChannel）.
D. On the client， use GetCallbackChannel（Of T）.
相关考题
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单项选择题
YouarecreatingaWindowsCommunicationFoundation（WCF）servicethatimplementsoperationsinaRESTfulmanner.Youneedtoaddadeleteoperation.Youimplementthedeletemethodasfollows.stringvoidDeleteItems（stringid）；YouneedtoconfigureWCFtocallthismethodwhentheclientcallstheservicewiththeHTTPDELETEoperation.Whatshouldyoudo？（）
A. Add the WebInvoke（UriTemplate = "/Items/{id}"，Method="DELETE"） attribute to the operation.
B. Add the HttpDelete attribute to the operation.
C. Replace the string parameter with a RemovedActivityAction parameter.
D. Replace the return type with RemovedActivityAction. -
单项选择题
WindowsCommunicationFoundation（WCF）applicationusesadatacontractthathasseveraldatamembers.YouneedtheapplicationtothrowaSerializationExceptionifanyofthedatamembersarenotpresentwhenaserializedinstanceofthedatacontractisdeserialized.Whatshouldyoudo？（）
A. Add the Known Type attribute to the data contract.Set a default value in each of the data member declarations.
B. Add the Known Type attribute to the data contract.Set the Order property of each data member to unique integer value.
C. Set the Emit Default Value property of each data member to false.
D. Set the Is Required property of each data member to true.
