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

1. A service implements the following contract. (Line numbers are included for reference only.)

The service is implemented as follows.

ContosoService uses NetMsmqBinding to listen for messages. The queue was set up to use transactions for adding and removing messages.
You need to ensure that OperationOne and OperationTwo execute under the same transaction context when they are invoked in the same session.
What should you do?

A) Insert the following attribute to OperationOne on ContosoService.
<OperationBehavior(
TransactionScopeRequired:=True,
TransactionAutoComplete:=False)>
Insert the following attribute to OperationTwo on ContosoService.
<OperationBehavior
(TransactionScopeRequired:=True,
TransactionAutoComplete:=True)>
B) Add the following XML segment to the application config file in the
system.serviceModel/bindings configuration section.
<netMsmqBinding>
<binding name="contosoTx" durable="true" receiveContextEnabled="true" />
</netMsmqBinding>
Then use the NetMsmqBinding named contosoTx to listen for messages from the clients.
C) Insert the following attribute to OperationOne on IContosoService.
<TransactionFlow(TransactionFlowOption.Mandatory)>
Insert the following attribute to OperationTwo on IContosoService.
<TransactionFlow(TransactionFlowOption.Mandatory)>
D) Add the following XML segment to the application config file in the
system.serviceModel/bindings configuration section.
<customBinding>
<binding name="contosoTx">
<transactionFlow />
<binaryMessageEncoding />
<msmqTransport durable="true" />
</binding>
</customBinding>
Then use the CustomBinding named contosoTx to listen for messages from the clients.

2. A Windows Communication Foundation (WCF) client application is consuming an RSS syndication feed from a blog. You have a SyndicationFeed variable named feed. The application iterates through the items as follows. (Line numbers are included for reference only.)
01 For Each item As SyndicationItem In feed.Items
02
03
04 Next
You need to display the content type and body of every syndication item to the console.
Which two lines of code should you insert between lines 02 and 03?

A) Console.WriteLine(item.Content.Type) Console.WriteLine(item.Content.ToString())
B) Console.WriteLine(item.Content.GetType()) Console.WriteLine(item.Content.ToString())
C) Console.WriteLine(item.Content.Type) Console.WriteLine(DirectCast(item.Content, TextSyndicationContent).Text)
D) Console.WriteLine(item.Content.GetType()) Console.WriteLine(DirectCast(item.Content, TextSyndicationContent).Text)

3. A Windows Communication Foundation (WCF) service interacts with the database of a workflow engine. Data access authorization is managed by the database, which raises security exceptions if a user is unauthorized to access it.
You need to ensure that the application transmits the exceptions raised by the database to the client that is calling the service.
Which behavior should you configure and apply to the service?

A) routing
B) serviceSecurityAudit
C) workflowUnhandledException
D) serviceDebug

4. An existing Windows Communication Foundation (WCF) service uses basicHttpBinding. You are releasing updates to the service and the client application.
You need to enable the client application to flow transactions to the service.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A) Change the binding to use basicHttpContextBinding.
B) Change the binding to use wsHttpBinding.
C) Change to a custom binding that has the transactionFlow, textMessageEncoding, and httpTransport binding elements in this order.
D) Change to a custom binding that has the httpTransport, textMessageEndcoding, and transactionFlow binding elements in this order.

5. You are developing a Windows Communication Foundation (WCF) service to provide an in-memory cache. The following code is part of your solution. (Line numbers are included for reference only.)
01 02 Public Interface IlnMemoryCacheService 03 04 <OperationContract()> 05 Function GetCachedItem( ByVal key As String) As String 06 07 <OperationContract() > 08 Sub CacheItem( ByVal key As String, ByVal item As String) 09 10 End Interface 11 12 <ServiceBehavior( InstanceContextMode:=InstanceContextHode.Single)> 13 Public Class CacheService 14 Implements IlnHemoryCacheService 15 16 Dim cache As Hashtatale - New Hashtable)> 17 18 Public Function GetCachedItem( ByVal key As String) As String mplements IInHemoryCacheService.GetCachedltem 19 20 Return cache (key) .ToStrlng() 21 22 End Function
23 24 Public Sub Cacheltem( ByVal key As String, ByVal item As String) Implements ilnMemoryCacheService.Cacheltem Then 25 26 If (cache.Contains(key) 27 cache.Remove(key) 28 End If 29 30 cache.Add(key, item) 31 32 End Sub
34 End Class
Users report that the cache is getting updated with cache changes of other users. You need to ensure that each user's cache is maintained and isolated from other users.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) At line 12, replace InstanceContextHode.Single with InstanceContextHode.PerCall.
B) Insert the following code at line 01. <ServiceContract(SessionHode:=SessionHode.Required)>
C) Insert the following code at line 01. <ServiceContract(SessionMode:=SessionHode.NotAllowed)>
D) At line 12, replace InstanceContextHode.Single with InstanceContextHode.PerSession.

Solutions: