A．气温偏高B．气温偏低C．降水正常D．降水略少

A self-hosted Windows Communication Foundation (WCF) service uses a secure HTTP binding with a custom principal permission mode. The binding requires users to provide their Windows logon credentials. You need to retrieve the identity of the caller.What are two possible properties you can use to achieve this goal？ (Each correct answer presents a complete solution Choose two)（）

A. Thread.CurrentPrincipal.Identity.Name

B. HttpContext.Current.User.Identity.Name

C. ServiceSecurityContext.Current.PrimaryIdentity.Name

D. OperationContext.Current.ServiceSecurityContext.PrimaryIdentity.Name

A Windows Communication Foundation (WCF) solution exposes the following contract over an HTTP connection.[ServiceContract]public interface IDataService{ [OperationContract] string GetData();}Existing clients are making blocking calls to GetData. Calls to GetData take five seconds to complete.You need to allow new clients to issue non-blocking calls to get the data, without breaking any existing clients. What should you do？（）

A.

B.

C.Generate a proxy class with asynchronous methods and use it for the new clients

D. Add a new endpoint to the service that uses a full-duplex binding and use it for the new clients.

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？（）

A.

B.

C.

D.

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？（）

A.

B.

C.

D.

You are developing a Windows Communication Foundation (WCF) service. The service configuration file has a element defined. You need to ensure that all security audit information, trace logging, and message logging failures are recorded.Which configuration segment should you add to the element？（）

A.

B.

C.

D.

You are developing a Windows Communication Foundation (WCF) service.You must record all available information for the first 1,000 messages processed, even if they are malformed.You need to configure the message logging section of the configuration file.Which configuration segment should you use？ （）

A.

B.

C.

D.

A Windows Communication Foundation (WCF) service is required to log all authorization attempts to the Windows Event Log. You need to configure a behavior and apply it to the service to support this requirement. Which behavior should you configure and apply？（）

A. service Authentication Manager

B. service Authorization

C. service Credentials

D. service Security Audit

A Windows Communication Foundation (WCF) solution provides a session-based counter.The service is self-hosted. The hosting code is as follows:ServiceHost host = new ServiceHost(typeof(CounterService));NetTcpBinding binding1 = new NetTcpBinding(SecurityMode.None);host.AddServiceEndpoint("MyApplication.ICounterService", binding1, "net.tcp://localhost:23456");host.Open();This service is currently exposed over TCP, but needs to be exposed to external clients over HTTP. Therefore, a new service endpoint is created with the following code:host.AddServiceEndpoint("MyApplication.ICounterService", binding2, "http://localhost:12345");You need to complete the implementation and ensure that the session-based counter will perform over HTTP as it does over TCP.What should you do？（）

A.

B.

C.

D.

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？（）

A.

B.

C.

D.

You are developing a Windows Communication Foundation (WCF) service that contains the following operation contract.[OperationContract]CustomerNames GetCustomerNames();The operation returns customer names. You need to develop a definition for the operation contract that produces XML with the following structure.Which code segment should you use？ （）。

A.

B.

C.

D.