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

1. You are creating a Windows Communication Foundation (WCF) service that is implemented as folks. (Line numbers are included for reference only.)
01 <ServiceContract()
02<ServiceBehaior(lncludeExceptionDetailInFaults: Time)>
03Public Class OrderService
04
05eCNperationCortracto()>
O6Putdic Sub Submit Order(ByVal anOrder As Order)
07
08Try
09. 10Catch ex As D wide By Zero Exception 11 12End Try 13End Sub 14 1 5End Class
You need to ensure that the sack trace details of the exception are not included in the error information sent to the client. What should you do?

A) After line 05, add the following line.
<FaultContract(GetType(FaultException(CX Order)))>
Replace line 11 with the following line.
Throw New FaultException(CX Order)(
anOrder, "Divide by zero exception")
B) Replace line 11 with the following line.
Throw
C) Replace line 11 with the following line.
Throw New FaultException(C Order)(anOrder, exToSthng0)d
D) After line 05, add the following line.
'cFaultContract(GetType(FautException(Of Order)))>
Replace line 11 with the following line.
Throw ex

2. You are developing a Windows Communication Foundation (WCF) service.
One of the service operations contains the following code.
private static int counter = 0;
[OperationContract]
public void IncrementCount()
[
counter++;
}
You need to set a service behavior that prevents two or more threads from incrementing the counter variable at the same time.
Which code segment should you use to set the service behavior?

A) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Single)]
B) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.PerCall,
ConcurrencyMode = ConcurrencyMode.Reentrant)]
C) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Hultiple)]
D) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.PerSession,
ConcurrencyMode = ConcurrencyMode.Single)]

3. You are developing a client application that consumes a Windows Communication Foundation (WCF) service. The operation contract is as follows.
[OperationContract]
[FaultContract(typeof(SalesFault))]
string GetSales(string saleld);
The service configuration file contains the following line in the serviceBehaviors section.
<behavior>
<serviceDebug inc1udeExceptionDetoillnFauIts-"True"/>
</behavior>
A divide-by-zero exception is not being handled by the service.
You need to ensure that the exception is caught in the client application.
Which type of exception should the client catch?

A) FaultException
B) FaultException<SalesFault>
C) TimeoutException
D) DivideByZeroException

4. 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) Windows Process Activation Services (WAS)
B) Microsoft Internet Information Services (IIS) 6.0
C) a Windows Forms application
D) a Windows Service

5. You are developing a Windows Communication Foundation (WCF) service that contains the following service contract.
<ServiceContract() > Public Interface IPaymentService <OperationContract() > Sub RecordPayments(ByVal person As Person) End Interface Public Class Person End Class Public Class Employee Inherits Person End Class Public Class Customer Inherits Person End Class
You need to ensure that RecordPayments can correctly deserialize into an Employee or a Customer object.
What should you do?

A) Add the following KnownType attributes to the Person class. <KnownType(GetType(Employee))> <KnownType(GetType(Customer))>
B) Implement the IExtension(Of T) interface in the Person class.
C) Add the following KnownType attribute to the Employee class and to the Customer class. <KnownType(GetType(Person))>
D) Implement the IExtensibleDataObject interface in the Person class.

Solutions: