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

1. You are developing a new version of an existing message contract named CustomerDetailsVersion1.
The new version of the message contract must add a Department field of type String to the SOAP header.
You create a new class named CustomerDetailsVersion2 that inherits from CustomerDetailsVersion1.
You need to ensure that all client applications can consume the service.
Which code segment should you use?

A) <MessageContract() > Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(HustUnderstand:=False)> Public Department As String End Class
B) <MessageContract()> Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(HustUnderstand:=True)> Public Department As String End Class
C) Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(HustUnderstand:=False) > Public Department As String End Class
D) Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(MustUnderstand:=True)> Public Department As String End Class
E) Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(HustUnderstond:"True)> Public Department As String End Class

2. You are creating a Windows Communication Foundation (WCF) service that responds using plain-old XML (POX).
You have the following requirements:
- You must enable the /catalog.svc/items operation to respond using the POX, JSON, or ATOM formats. You also must ensure that the same URL is used regardless of the result type.
- You must determine the response format by using the Accepts HTTP header.
What should you do?

A) Set the BodyStyle parameter of the WebGet attribute on the operation to WebMessageBodyStyle.WrappedResponse.
B) Implement the IChannelInitializer interface in the service class.
C) Set the return type of the operation to System.ServiceModel.Channels.Message. Use the current WebOperationContext methods to return the data in the required format.
D) Implement the System.Runtime.Serialization.IFormatterConverter interface in the service class.

3. 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 performanceCounters="ServiceOnly" />
D) <diagnostics wmiProviderEnabled="true" />

4. A WCF service code is implemented as follows. (Line numbers are included for reference only.)
01 <ServiceContract()> 02 <ServiceBehavior( 03 InstanceContextMode:=InstanceContextMode.Single)> 04 Public Class CalculatorService 05 06 <OperationContract()> 07 Public Function Calculate(ByVal op1 As Double, 08 ByVal op As String, ByVal op2 As Double) As Double & 24 End Function 25 26 End Class
You need to decrease the response time of the service.
What are two possible ways to achieve this goal (Each correct answer presents a complete solution? Choose two.)

A) Change the service behavior to the following. <ServiceBehavior( InstanceContextMode:=InstanceContextMode.Single, ConcurrencyMode:=ConcurrencyMode.Multiple)>
B) Change the service behavior to the following. <ServiceBehavior(InstanceContextMode:=InstanceContextMode.PerCall)>
C) Require the clients use threads, the Parallel Task Library, or other mechanism to issue service calls in parallel.
D) Require the clients to use async operations when calling the service.

5. 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) [DataContract]
public class CustomerNames
{
B) [DataContract]
public class CustomerNames
{
[DataMember]
public string[] Names;
}
C) [MessageContract(IsWrapped = false)]
public class CustomerNames
{
[MessageBodyMember]
public string[] Names;
}
D) [MessageBodyMember]
public string[] Names;
}
E) [DataMember(IsRequired = false)]
public string[] Names;
}
F) [MessageContract(WrapperName = "")]
public class CustomerNames
{

Solutions: