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

1. You develop a Windows Communication Foundation (WCF) service to generate reports. Client applications call the service to initiate report generation but do not wait for the reports to be generated. The service does not provide any status to the client applications.
The service class is defined as follows. (Line numbers are included for reference only.)

You need to ensure that client applications can initiate reports without waiting for status.
Which two actions should you perform (Each correct answer presents part of the solution. Choose two.)

A) Insert the following code at line 04. [OperationContract(IsOneWay=true)]
B) At line 05, change the GenerateReports method from private to public.
C) Insert the following code at line 04. [OperationContract(AsyncPattern=false)]
D) Remove line 08. At line 05, change the return type of GenerateReports method to void.

2. You are moving a Windows Communication Foundation (WCF) service into production. You need to be able to monitor the health of the service.
You only want to enable all performance counter instances exposed by the ServiceModelService 4.0.0.0 counter group.
Which element should you add to the system.serviceModel section in the application configuration file?

A) <diagnostics performanceCounters="All" />
B) <diagnostics wmiProviderEnabled="true" performanceCounters="Off" />
C) <diagnostics wmiProviderEnabled="true" />
D) <diagnostics performanceCounters="ServiceOnly" />

3. A Windows Communication Foundation (WCF) client communicates with a service. You created the client proxy by using Add Service Reference in Microsoft Visual Studio.
You need to ensure that the client accepts responses of up to 5 MB in size.
What should you change in the configuration file'?

A) the value of the maxBufferSize attribute to 5242880
B) the value of the maxBytesPerRead attribute to 5242880
C) the value of the maxReceivedMessageSize attribute to 5242880
D) the value of the maxBufferPoolSize attribute to 5242880

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 {
01 [OperationContract]
05 void PutMessage(string message);
07 [OperationContract]
08 [FaultContract(typeof(TimeoutFaultException)) ]
09 [FaultContract(typeof(FaultException) ) ]
10 stringf] SearchMessages(string search);
11 }
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 TimeoutFaultException.Catch FaultException and create a new channel.
B) Catch and handle FaultException.Catch TimeoutFaultException and create a new channel.
C) Catch and handle both TimeoutFaultException and FaultException
D) Catch both TimeoutFaultException and FaultException. Create a new channel in both cases.

5. You are developing a client application that uses the following code to consume a Windows Communication Foundation (WCF) service. (Line numbers are included for reference only.)
01 BasicHttpBinding myBinding = new BasicHttpBinding(); 02 EndpointAddress myEndpointAddress = new EndpointAddress( "http://contoso.com/TaxService.svc");
04 ITaxService client = channelFactory.CreateChannel();
05 string data = client.GetData(1);
You need to consume the service.
Which code segment should you insert at line 03?

A) var channelFactory = new ChannelFactory<ITaxService>( "http://contoso.com/TaxService.svc");
B) var channelFactory = new ChannelFactory<ITaxService>( myBinding, myEndpointAddress);
C) var channelFactory = new ChannelFactory<ITaxService>( myBinding);
D) var channelFactory = new ChannelFactory<ITaxService>();

Solutions: