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

1. A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients. (Line numbers are included for reference only.)

The code for the service class is as follows.

The service is self-hosted. The hosting code is as follows.

You need to ensure that all clients calling GetMessage will retrieve the updated string if the message is updated by any client calling PutMessage.
What should you do?

A) Pass a service instance to the instancing code in line 24, as follows.
ServiceHost host = new ServiceHost(new TeamMessageService());
B) Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
C) Redefine the message string in line 13, as follows.
static string message = "Today' s Message";
Then change the implementation of PutMessage in lines 19-22 to the following.
public void PutMessage(string message) {
TeamMessageService.message = message; >
D) Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(InstanceContextMode =
InstanceContextMode.PecSession) ]
Than change che binding definition on the service at line 25, and on the client to the
following.
WSHttpBinding binding = new WSHttpBinding(SecurityMode.None);
binding.ReiiabieSession.Enabled = true;

2. You are developing a Windows Communication Foundation (WCF) service to replace an existing ASMX Web service.
The WCF service contains the following code segment. (Line numbers are included for reference only.)

The existing Web service returns the EmployeeID as an attribute of the EmployeeInfo element in the response XML.
You need to ensure that applications can consume the service without code changes in the client.
What should you do?

A) Insert the following code at line 20.
<DataContractFormat()>
Insert the following code at line 22.
<DataMember()>
B) Insert the following code at line 02.
<DataConttactFormat()>
Insert the following code at line 22.
<DataMember ()>
C) Insert the following code at line 09.
<XmlSerializerFocmat()>
Insert the following code at line 22.
<XmlAttribute()>
D) Insert the following code at line 02.
<XmlSerializerFormat()>
Insert the following code at line 22.
<XmlAtttibute()>

3. You are creating a Windows Communication Foundation (WCF) service that implements the following service contract.
[ServiceContract]
public interface IOrderProcessing
{
[OperationContract]
void ApproveOrder(int id);
}
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) Add a SecurityPermission attribute to the method and set the SecurityAction to Demand.
C) 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.
D) In the method body, check the Rights.PossessProperty property to see if it contains Manager.

4. 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) In the machine configuration file, add the following XML segment to the
system.serviceModel configuration section.
<machineSettings enableLoggingKnownPii="true" />
In the application configuration file, add the logKnownPii attribute to the message logging
diagnostics source and set the value of the attribute to true.
In the application configuration file, add the following XML segment to the
system.serviceModel configuration section group.
<diagnostics>
<messageLogging logMessagesAtTransportLevel="true"/>
</diagnostics>
B) In the application configuration file, add the logKnownPii attribute to the message logging diagnostics source and set the value of the attribute to true.
Generate the ContosoService class using the Add Service Reference wizard.
Add a reference to System.ServiceModel.Routing.dll.
Add the following code segment.
Dim client As ContosoService = New ContosoService()
Dim behavior As SoapProcessingBehavior = New SoapProcessingBe
havior() behavior.ProcessMessages = True
client.Endpoint.Behaviors.Add(behavior)
C) In the machine configuration file, add the following XML segment to the
system.serviceModel configuration section.
<machineSettings enableLoggingKnownPii="true" />
Generate the ContosoService class using the Add Service Reference wizard.
Add the following code segment.
Dim client As ContosoService = New ContosoService()
client.Endpoint.Behaviors.Add(New CallbackDebugBehavior(True))
D) In the application configuration file, add the following XML segment to the
system.serviceModel configuration section group.
<diagnostics>
<messageLogging logMessagesAtTransportLevel="true"
logEntireMessage="true" />
</diagnostics>

5. 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) Implement the IChannelInitializer interface in the service class.
B) Set the BodyStyle parameter of the WebGet attribute on the operation to WebMessageBodyStyle.WrappedResponse.
C) Implement the System.Runtime.Serialization.IFormatterConverter interface in the service class.
D) 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.

Solutions: