A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients. (Line numbers are included for reference only.) 01 [ServiceContract] 02 public interface ITeamMessageService 03 { 04 [OperationContract] 05 string GetMessage0; 07 [OperationContract] 08 void PutMessage(string message); 09) The code for the service class is as follows 10 public class TeamMessageService: ITeamMessageService 11 { 12 Guid key = GuicLNewGuidO; 13 string message = "Today's Message":

14 public string GetMessage() 15 { 16 return stringFormat("Message:{0} Key:{1}", message, Key); 17 19 public void PutMessage(string message) 20 { 21 thismessage = message; 22 } 23 ) The senvice is self-hosted. The hosting code is as follows. 24 ServiceHost host = 25 BasicHttpBinding binding = new BasicHttpBinding(BasicHttpSecuntyMode.None):

26 host AddServiceEndpoint( HMyApplication lTeamMessageService, binding, "http:/Ilocalhost: 12345w); 27 host Open0;) You need to ensure that all clients calling GetMessage will retrieve the same string, even if the message is updated by clients calling PutMessage What should you do?

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A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients. (Line numbers are included for reference only.) 01 [ServiceContract] 02 public interface ITeamMessageService 03 { 04 [OperationContract] 05 string GetMessage0; 07 [OperationContract] 08 void PutMessage(string message); 09) The code for the service class is as follows 10 public class TeamMessageService: ITeamMessageService 11 { 12 Guid key = GuicLNewGuidO; 13 string message = "Today's Message":

14 public string GetMessage() 15 { 16 return stringFormat("Message:{0} Key:{1}", message, Key); 17 19 public void PutMessage(string message) 20 { 21 thismessage = message; 22 } 23 ) The senvice is self-hosted. The hosting code is as follows. 24 ServiceHost host = 25 BasicHttpBinding binding = new BasicHttpBinding(BasicHttpSecuntyMode.None):

26 host AddServiceEndpoint( HMyApplication lTeamMessageService, binding, "http:/Ilocalhost: 12345w); 27 host Open0;) You need to ensure that all clients calling GetMessage will retrieve the same string, even if the message is updated by clients calling PutMessage What should you do?

Accepted Answer

A. Add the following attribute to the TeamMessageService class, before line 10.

Answer

B. Add the following attribute to the TeamMessageService class, before line 10.

Answer

C. Pass a service instance to the instancing code in line 24, as follows.

Answer

D. Redefine the message string in line 13, as follows

A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients. (Line numbers are included for reference only.) 01 [ServiceContract] 02 public…

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