Add the KnownType attribute to the data contract. Set a default value in each of the data member declarations.
Add the KnownType attribute to the data contract. Set the Order property of each data member to unique integer value.
Set the EmitDefaultValue property of each data member to false.
Set the lsRequired property of each data member to true.
第1题：
You are developing an application that performs file backups in the background. The background application will host a Windows Communication Foundation (WCF) service and must be active as soon as the machine is running. The background application will not have a user interface. A front-end application will consume the WCF service and will provide the user interface.You need to choose a host environment for the WCF service.Which hosting environment should you choose? （）
A. Microsoft Internet Information Services (IIS) 6.0
B. Windows Process Activation Services (WAS)
C. A Windows Forms application
D. A Windows Service
第2题：
You want to debug the Windows Communication Foundation (WCF) client and server interaction through message and application tracing.You need to correlate traces generated on the client and the server. Which XML segment should you add to the system.diagnostics configuration element in the client and server application configuration file?（）
A.
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D.
第3题：
You are developing a Windows Communication Foundation (WCF) service that will be hosted in Microsoft Internet Services (IIS) 7.0.The service must be hosted in an IIS application named Info. You need to enable this service to be hosted in IIS by changing the web.config file.Witch XML segment should you add to the web.config file?（）
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B.
C.
D.
第4题：
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第5题：
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第6题：
You are creating an application that consumes a Windows Communication Foundation (WCF) service. The service implements the IService contract. The client application contains the CallbackHandler class, which implements IServiceCallback.You need to ensure that a client proxy is created that can communicate with the service over a duplex channel.Which code segment should you use?（）
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第7题：
Windows Communication Foundation (WCF) service is self-hosted in a console application. The service implements the lTimeService service interface in the TimeService class.You need to configure the service endpoint for HTTP communication. How should you define the service and endpoint tags?（）
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第8题：
You are developing a Windows Service. The Windows Service will host a Windows Communication Foundation (WCF) service.The Windows Service class will inherit from ServiceBase.You need to ensure that the WCF service starts when the Windows Service is restarted.What should you do in the Windows Service class?（）
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第9题：
Your Windows Communication Foundation (WCF) client application uses HTTP to communicate with the service.You need to enable message logging and include all security information such as tokens and nonces in logged messages.What should you do?（）
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D.
第10题：
A Windows Communication Foundation (WCF) service uses the following service contract. [ServiceContract] public interface IService{ [OperationContract] string Operation1(string s);}You need to ensure that the operation contract Operation1 responds to HTTP POST requests.Which code segment should you use?（）
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