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Microsoft TS: Windows Communication Foundation velopment with Microsoft .NET Framework 4 Sample Questions:

1. You are creating a Windows Communication Foundation (WCF) service that implements the following service contract.
<ServiceContract()>
Public Interface IOrderProcessing
<OperationContract()>
Sub ApproveOrder(ByVal id As Integer)
End Interface
You need to ensure that only users with the Manager role can call the ApproveOrder method. What should you do?

A) Add a PrincipalPermission attribute to the method and set the Roles property to Manager.
B) In the method body, create a new instance of WindowsClaimSet. Use the FindClaims method to locate a claimType named Role with a right named Manager.
C) Add a SecurityPermission attribute to the method and set the SecurityAction to Demand.
D) In the method body, check the Rights.PossessProperty property to see if it contains Manager.

2. A Windows Communication Foundation (WCF) application exposes a service as a SOAP endpoint for consumption by cross-platform clients. During integration testing, you find that one of the clients is not generating the correct messages to the WCF application.
In order to debug the issue and fix the communication, you need to configure the service to log messages received from the client.
What should you do?

A) Enable messageLogging in the System.ServiceModel diagnostics element configuration and configure a listener for the System.ServiceModel trace source.
B) Set an etwTracking behavior on the service and configure a listener for the System.ServiceModel trace source.
C) Enable messageLogging in the System.ServiceModel diagnostics element configuration and configure a listener for the System.ServiceModel.MessageLogging trace source.
D) Set an etwTracking behavior on the service and configure a listener for the System.ServiceModel.MessageLuqqing trace source.

3. 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?

A) var handler = new CallbackHandler();
var clientFactory = new DuplexChannelFactory<IService>{
typeof(CallbackHandler), new WSDualHttpBinding());
var client = clientFactory.CreateChannel(
new EndpointAddress ("")) ;
B) var handler = new CallbackHandler();
var clientFactory = new DuplexChannelFactory<IService>{
new WSHttpContextBinding() ;
var clienc = clientFactory.CreateChannelt
new InstanceContext (handler) , new EndpointAddress (" "));
C) var handler = new CallbackHandler();
var clientFactory =
new DuplexChonnelFaccory<IService>{
typeof(CallbackHandler), new WSDualHttpBinding ()); var client =
clientFactory.CreateChannel(
new InstanceContext (handler) , new EndpointAddress ("")) ;
D) var handler = new CallbackHandler();
var clientFactory = new DuplexChannelFactory<IService>{
new WSHttpBinding());
var client = clientFactory.CreateChannel(
new InstanceContext (handler) , new EndpointAddress ("")) ;

4. A Windows Communication Foundation (WCF) service implements the following contract. (Line numbers are included for reference only.)
01 <ServiceContract()>
02 Public Interface IDataAccessService
03
04 <OperationContract()>
05 Sub PutMessage(ByVal message As String)
06
07 <OperationContract()>
08 <FaultContract(GetType(TimeoutFaultException))>
09 <FaultContract(GetType(FaultException))>
10 Function SearchMessages(ByVal search As String) As String ()
11
12 End Interface
The implementation of the SearchMessages method throws TimeoutFaultException exceptions for database timeouts. The implementation of the SearchMessages method also throws an Exception for any other issue it encounters while processing the request. These exceptions are received on the client side as generic FaultException exceptions.
You need to implement the error handling code for SearchMessages and create a new channel on the client only if the channel faults.
What should you do?

A) Catch and handle FaultException. Catch TimeoutFaultException and create a new channel.
B) Catch and handle both TimeoutFaultException and FaultException.
C) Catch both TimeoutFaultException and FaultException. Create a new channel in both cases.
D) Catch and handle TimeoutFaultException. Catch FaultException and create a new channel.

5. You are developing a Windows Communication Foundation (WCF) service. You enable message logging, trace listeners, activity propagation, and tracing on the trace sources.
You have the following code segment in the client application. (Line numbers are included for reference only.)

You encounter errors when your client application consumes the service.
You need to ensure that your client application can correlate tracing information with the
service.
Which code segment should you add at line 04?

A) Option D
B) Option C
C) Option A
D) Option B

Solutions: