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

1. You are developing a Windows Service. The Windows Service will host a Windows Communication Foundation (WCF) service.
The Windows Service class will inherit from ServiceBase.
You need to ensure that the WCF service starts when the Windows Service is restarted.
What should you do in the Windows Service class?

A) Create a public method named Main.
Create a new ServiceHost in the Main method.
Override the OnShutdown method and close the ServiceHost.
B) Override the OnContinue method and open a new ServiceHost.
Override the OnStop method and close the ServiceHost.
C) Override the OnStart method and create and open a new ServiceHost.
Override the OnStop method and close the ServiceHost.
D) Override the OnPowerEvent method and open a new ServiceHost.
Override the OnShutdown method and close the ServiceHost.

2. You are hosting a Windows Communication Foundation (WCF) service under Microsoft Internet Information Services (IIS) 7.0.
You have set up a Web site in IIS Manager. The physical path is C:\wwwroot\Calendar. There is a Calendar.svc file in the C:\wwwroot\Calendar folder. It contains the following directive.
<%@ ServiceHost Language="VB" Debug="true" Service="Calendar.Calendar" CodeBehind="Calendar.svc.vb" %>
The Calendar.svc.vb file contains the source for the Calendar class in the Calendar namespace. You compile this code into the Calendar.dll file.
You need to deploy your service to the Web site.
What should you do?

A) Copy the Calendar.svc.vb file to the C:\wwwroot\Calendar\code folder.
B) Copy the Calendar.svc.vb file to the C:\wwwroot\Calendar\bin folder.
C) Copy the Calendar.dll file to the C:\wwwroot\Calendar\code folder.
D) Copy the Calendar.dll file to the C:\wwwroot\Calendar\bin folder.

3. A Windows Communication Foundation (WCF) service has the following contract.
[ServiceContract(Namespace="http://contoso.com")] public interface IShipping { [OperationContract] string DoWork(int id); }
This is one of several service contracts hosted by your application. All endpoints use SOAP
1.2 bindings with WS-Addressing 1.0. The System.ServiceModel.MessageLogging trace source in the system.diagnostics configuration section is configured with one listener.
You need to make sure that only the messages that are returned from the DoWork operation are logged.
Which XML segment should you add to the system.serviceModel/diagnostics/messageLogging/filters configuration element?

A) <add xmlns:addr="http://www.w3.org/2005/08/addressing"> //addr:Action[text() =
'http://contoso.com/IShipping/DoWork']
</add>
B) <add xmlns:soap="http://www.w3.org/2003/05/soap-envelope"> //soap:Action[text() =
'http://contoso.com/IShipping/DoWork']
</add>
C) <add xmlns:soap="http://www.w3.org/2003/05/soap-envelope"> //soap:Action[text() =
'http://contoso.com/IShipping/DoWorkResponse']
</add>
D) <add xmlns:addr="http://www.w3.org/2005/08/addressing"> //addr:Action[text() =
'http://contoso.com/IShipping/DoWorkResponse']
</add>

4. You are developing a Windows Communication Foundation (WCF) service that allows customers to update financial data. The client applications call the service in a transaction. The service contract is defined as follows. (Line numbers are included for reference only.)
01 <ServiceContract()>
02 Public Interface IDatallpdate
03
04 <OperationContract()>
05 <TransactionFlow(TransactionFlowOption.Handatocy)>
06 Sub Update (ByVal accountNumber As String,
ByVal amount As Double)
07
08 End Interface
09
10 Class UpdateService
11 Implements IDataUpdate
12
13 <OperationBehavior(
TransactionScopeRequired:=True, TransactionAutoComplete:=True)>
14 Public Sub Update(ByVal accountNumber As String,
ByVal amount As Double)
Implements IDataUpdate.Update IS
16 Try
17 18 Catch ex As Exception
19 WriteErrorLog(ex) 20
21 End Try
22
23 End Sub
24
25 End Class
Customers report that the transaction completes successfully even if the Update method throws an exception.
You need to ensure that the transaction is aborted if the Update method is not successful.
What should you do?

A) Replace line 13 with the following line. <OperationBehavior( TransactionScopeRequired:MTrue, TransactionAutoComplece:"False)>
B) Insert the following line at line 09. <ServiceBehavior( TransacCionAucoCompleteOnSesslonClose:"True) >
C) insert the following line at line 20. Throw
D) Insert the following line at line 09. <ServiceBehavlor( TransactionAutoCoropleteOnSessionClose:"False) >

5. You are developing a client application that consumes a Windows Communication Foundation (WCF) service.
You use the svcutil.exe utility to create a proxy for the service.
You use the svcutil.exe switches that generate asynchronous calls. GetFlight is a service operation that takes no parameters and returns a string. The GetFlightCallback method must be called when the service operation returns.
You create an instance of the client proxy with the following code.
var client = new TravelServiceClient();
You need to ensure that a callback is received when the GetFlight operation is called asynchronously.
Which code segment should you use?

A) client.GetFlightCompleted += new EventHandler<GetFlightCompletedEventArgs>( GetFlightCallback); client.GetFlightAsync();
B) client.BeginGetFlight(GetFlightCallback, null); client.GetFlight();
C) IAsyncResult asyncResult = client.BeginGetFlight( GetFlightCallback, client); client.EndGetFlight(asyncResult);
D) client.GetFlight(); client.BeginGetFlight(GetFlightCallback, null);

Solutions: