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

1. A Windows Communication Foundation (WCF) solution uses two services to manage a shopping cart. Service
A processes messages containing line items that total between $0 and $500. Service B processes messages containing line items that total more than $500.
All messages are of equal importance to the business logic.
You need to route incoming messages to the appropriate services by using WCF routing.
Which two message filters should you add to the router? (Each correct answer presents part of the solution. Choose two.)

A) a message filter with a priority of 100 that will forward messages that total between $0 and $500 to Service A
B) a message filter with a priority of 0 that will forward all messages to Service B
C) a message filter with a priority of 0 that will forward messages that total between $0 and $500 to Service A
D) a message filter with a priority of 100 that will forward all messages to Service B

2. You are developing a Windows Communication Foundation (WCF) service that is hosted by a Windows Forms application.
The ServiceHost instance is created in the Form constructor.
You need to ensure that the service is not blocked while the UI thread is busy.
What should you do?

A) Decorate the service implementation class with the following line of code.
[ServiceBehavior(
UseSynchronizationContext = false)]
B) Call the BeginInvoke method of the form and supply a delegate.
C) Decorate the service implementation class with the following line of code.
[ServiceBehavior(
ConcurrencyMode = ConcurrencyMode.Multiple)]
D) Call the Invoke method of the form and supply a delegate.s

3. You are working with a Windows Communication Foundation (WCF) client application that has a generated proxy named SampleServiceProxy.
When the client application is executing, in line 02 of the following code, the channel faults (Line numbers are included for reference only.)
01 SampleServiceProxy proxy new SampleServiceProxy()
02try
03{
04proxy Processlnvoice(invoice);
05)
06catch
07{
08 (proxy. State == CommunicationState. Faulted)
09{
11)
12)
13 proxy Update Customer(customer);
You need to retumn proxy to a state in which it can successfully execute the call in line 13.
Which code segment should you use at line 10?

A) proxy new SampleServiceProxy0;c
B) proxy.CloseO;
C) proxy.AbortO,
D) proxy.Open()

4. A Windows Communication Foundation (WCF) client configuration file contains the following XML segment in the system.serviceModel element.
<client>
<endpoint address=" net.tcp://server/ContosoService "
binding=" netTcpBinding "
contract=" Contoso. IContosoService "
name=" netTcp " / >
<endpoint address=" net.pipe://localhost/ContosoService "
binding=" netNamedPipeBinding "
contract=" Contoso. IContosoService "
name=" netPipe " />
</client>
You need to create a channel factory that can send messages to the endpoint listening at net.pipe://localhost/ContosoService.
Which code segment should you use

A) ChannelFactory < Contoso. IContosoService > factory =
new ChannelFactory < Contoso. IContosoService >(" Contoso. IContosoService ");
B) ChannelFactory < Contoso. IContosoService > factory =
new ChannelFactory < Contoso. IContosoService >(
" net.pipe://localhost/ContosoService ");
C) ChannelFactory < Contoso. IContosoService > factory =
new ChannelFactory < Contoso. IContosoService >(" netNamedPipeBinding ");
D) ChannelFactory < Contoso. IContosoService > factory =
new ChannelFactory < Contoso. IContosoService >(" netPipe ");

5. You are creating an application using Visual Studio 2010. The application consumes a Windows Communication Foundation (WCF) service.
You are adding a service reference to the WCF service.
You need to ensure that the generated proxy does not block the calling thread when executing a service method.
What should you do when adding the service reference?

A) Set the Collection type to ObservableCollection.
B) Select the Always generate message contracts option.
C) Select the Reuse types in all referenced assemblies option.
D) Select the Generate asynchronous operations option.

Solutions: