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

1. You are developing a Windows Communication Foundation (WCF) service. You enable logging in the configuration file. The opening tag is defined as follows.

You need to ensure that logging is implemented so that only messages with SOAP headers are logged.
What should you add to the filters element of the application configuration file?

A) Option B
B) Option D
C) Option C
D) Option A

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

3. A Windows Communication Foixdation (WCF) solution uses the following contracts (Line numbers are included for reference only)
01 eServiceContract(Callback contract: GetType(lNameService))> 02Putlic Interface I(IeetingService 03 04 <OperationContractO> 05Function GetMessage() As Stnng 06 07End Interface 08 09 <ServiceContractO> 1 OPublic Interface INameService 11 12 <OperationContractO> 1 3Function GetName() As String 14 15 End Interface
The code that implements the KleetingService interface is as follows.
20Public Class GretingService 21Impements lGreaingService 22 23Public Function GetMessage0As String
24lmpements IGredingService. GetMessage
25
26Dim clientChann As INameService =
27OperationContet. Current.
28GetCallbackChamel(Of INameService)()
29Dim clientName As String = clientChannelGetName()
30 Retumn String Format("Hello {O)", clientName)
31
32End Function
33hnd Class
The service is self-hosted The hosting code is as follows.
35Dim host As SeniceHost =
36New ServiceHost(GetType(GrstingService))?
37Dim binding As NetTcpBinding =
38New NetTcpBinding(Sec urityMode. None)
39hostAddServiceEndpoint('Myapplication lGreetingService".
4Obincng, net.tcp:Ilocalhost: 12345W)
41 HotOpen()l
The code that implements the INameService interface is as follows.
42Class NameService
43lmpements INameService
44
45Dim name As String
46
47Public Sub NameService(ByV name As String)
48Me.reme = name
49End Sub
50
51 Public Function GetName() As String
52lmpements INameService. GeName
53
54Reti.rn name
55End Function
56End Class Currently, this code fails at runtime, and an Invalid Operation Exception is thrown at mne 25.
You need to correct the code so that the call from the service back to the client complets successfully
What e two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A) Change the service contract definition in line 01 as follows.
<ServiceContract(CallbackContract: sGetType(lNameService), SessionMode
=SessknMode Required)>
B) Add the following attribute to the GreetingSenAce class, before line 20.
<ServiceBehavior(Conc
urrencyMode: zConctrencyMode Reentrant)>
C) Add the following attribute to the GreetingSence class, before line 20.
<ServiceBehavior(ConcurrencyMode: ConcurrencyMode. Multiple)>
D) Add the following attribute to the NameService class, before line 42.
<ServiceBehavior(ConcurrencyMode ConcisrencyMode. Reentrant)>

4. Your company has an existing Windows Communication Foundation (WCF) service. The following code segment is part of the service. (Line numbers are included for reference only.)

You need to ensure that AJAX client applications can access the service. Which code segment should you insert at line 02?

A) Option B
B) Option D
C) Option C
D) Option A

5. You are developing a Windows Communication Foundation (WCF) service. The service configuration file has a <System.Diagnostics> element defined.
You need to ensure that all security audit information, trace logging, and message logging failures are recorded.
Which configuration segment should you add to the <System.Diagnostics> element?

A) Option B
B) Option D
C) Option C
D) Option A

Solutions: