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

1. A Windows Communication Foundation (WCF) service has the following contract.

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:soap="http://www.w3.org/2003/05/soap-envelope">
//soap:Action[text() =
1http://contoso.com/I3hipping/DoWork']
</add>
B) <odd xmlns:addr-"http://vww.w3.org/2005/08/addressing">
//addr:Action[text() -
'http://contoso.com/IShipping/DoWorkResponse' ]
</add>
C) odd xmlns:soap="http://www.u3.org/2003/05/soap-envelope">
//soap:Action[text() =
'http://contoso.com/I5hipping/DoWorkResponse']
</add>
D) <add xmlns:addr="http://www.w3.org/2005/Q8/addressing">
//addr:Action[text() =
'http://contoso.com/IShipping/DoUork' ]
</add>

2. A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients. (Line numbers are included for reference only.)
01 <ServiceContract()> 02 Public Interface ITeamMessageService 03 04 <OperationContract()> 05 Function GetMessage() As String 06 07 <OperationContract()> 08 Sub PutMessage(ByVal message As String) 09 End Interface The code for the service class is as follows.
10 Public Class TeamMessageService 11 Implements ITeamMessageService 12 13 Dim key As Guid = Guid.NewGuid() 14 Dim message As String = "Today s Message" 15 16 Public Function GetMessage() As String _ 17 Implements ITeamMessageService.GetMessage 18 19 Return String.Format("Message:{0}. Key:{1}", message, key) 20 End Function 21 22 Public Sub PutMessage(ByVal message As String) _ 23 Implements ITeamMessageService.PutMessage 24 25 Me.message = message 26 End Sub 27 28 End Class
The service is self-hosted. The hosting code is as follows.
29 Dim host As ServiceHost = New ServiceHost(GetType(TeamMessageService)) 30 Dim binding As BasicHttpBinding = New BasicHttpBinding(BasicHttpSecurityMode.None)
31 host.AddServiceEndpoint(
"MyApplication.ITeamMessageService", binding,
"http://localhost:12345")
32 host.Open()
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 29, as follows.
Dim host As ServiceHost = New ServiceHost(New TeamMessageService())
B) Add the following attribute to the TeamMessageService class, before line 10002E
<ServiceBehavior(InstanceContextMode:=
InstanceContextMode.PerSession)>
C) Then change the implementation of PutMessage in lines 22-26 to the following.
Public Sub PutMessage(ByVal message As String) _
Implements ITeamMessageService.PutMessage
TeamMessageService.message = message
End Sub
D) Redefine the message string in line 14, as follows.
Shared message As String = "Today s Message"
E) Add the following attribute to the TeamMessageService class, before line 10.
<ServiceBehavior(InstanceContextMode:=InstanceContextMode.Single)>

3. A Windows Communication Foundation (WCF) service implements the following contract.
[ServiceContract| public interface IHelloService { [OperationContract]
[VVebGet(UriTemplate =
"hello?namee{name}")] string SayHello(string name);
}
The implementation is as follows.
public class HelloService: IHelloService { public string SayHello(string name)
{ return "Hello ".+ name;
}
}
The senvice is self-hosted, and the hosting code is as follows.
WebServiceHost svcHost = CreateHoseO;
svcHost.OpenO;
Console. ReadLineO;
SrvHost.CloseO;
You need to implement CreateHost so that the senvice has a single endpoint hosted at
http://localhost:8000/HelloService which code segment should you use?

A) Ur baseAddress = new Urit'http:I/localhost:800O1");r
WebServiceHost svc Host new WebServiceHost(typeof(HelloService), baseAddress);
svcHostAddServiceEndpoint(typeof(lHelloService),
new WebHttpBinding(WebHttpSecurityMode. None),
"HelloService"); return svc Host;
B) WebServiceHost svcHost new WebServiceHost(typeof(HelloService));
svcHost.AddServiceEndpoint(typeof(lHelloService),
new WebHttpBinding(WebHttpSecurityMode None),
"http://localhost:8000/HelloService");
return svcHost;
C) WebServiceHost svcHost = new Web Service Host(new HelloServiceO); svcHost
AddServiceEndpoint(typeof(lHelloService),
new WebHttpBinding(WebHttpSecurityMode. None),
"http://Iocalhost: 8000/HelloService");
return svcHost
D) Ur baseAddress new Uri('http //Iocalhost 8000/");
WebServiceHost svc Host =
new WebServiceHost(new HelloService0, baseAddress),
svc Host.AddServiceEndpoint(typeof(IHelloService),
new WebHttpBinding(WebHttpSec urityMode None),
"HelloService");
retumn svc Host;

4. DRAG DROP
You develop a Windows Communication Foundation (WCF) service that is hosted within a console application. The service implements the IRegistrationService interface in a class named RegistrationService. The service uses the following endpoint URL:
http://localhost:8080/registrationservice/basic
You need to configure the console application to host the service.
How should you complete the relevant markup? (To answer, drag the appropriate markup segment to the correct location in the answer area. Each segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

5. 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 wsHttpBinding.
B) Change the binding to use basicHttpContextBinding.
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.

Solutions: