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

1. You are creating a Windows Communication Foundation (WCF) service. You do not want to expose the internal implementation at the service layer. You need to expose the following class as a service named Arithmetic with an operation named Sum.
public class Calculator
{ public int Add(int x, int y)
{
}
}
Which code segment should you use?

A) [ServiceContract(Name="Arithmetic")] public class Calculator
{
[OperationContract(ReplyAction="Sum")]
public int Add(int x, int y)
{
.....
}
}
B) [ServiceContract(Name="Arithmetic")]
public class Calculator
{ [OperationContract(Name="Sum")]
public int Add(int x, int y)
{
....
}
}
C) [ServiceContract(Namespace="Arithmetic")]
public class Calculator
{
[OperationContract(Action="Sum")]
public int Add(int x, int y)
{
.....
}
}
D) [ServiceContract(ConfigurationName="Arithmetic")] public class Calculator
{
[OperationContract(Action="Sum")]
public int Add(int x, int y)
{
.....
}
}

2. 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 A
B) Option D
C) Option C
D) Option B

3. You implement a Windows Communication Foundation (WCF) service.
You must process all of the valid SOAP messages that the service receives.
What should you do?

A) On the OperationContractAttribute, call the Match method.
B) Call the Message.CreateMessage static method. Pass the value MessageVersion.Default as a parameter.
C) On the OperationContractAttribute of a method, set the value of the Action and ReplyAction properties to *.
D) On the OperationContractAttribute of a method, set the value of the Action and ReplyAction properties to ?.

4. You are creating an application that consumes a Windows Communication Foundation (WCF) service. The service implements the IService contract. The client application contains the CallbackHandler class, which implements IServiceCallback.
You need to ensure that a client proxy is created that can communicate with the service over a duplex channel.
Which code segment should you use?

A) var handler = new CallbackHandler();
var clientFactory = new DuplexChannelFactory<IService>{
new WSHttpBinding());
var client = clientFactory.CreateChannel(
new InstanceContext (handler) , new EndpointAddress ("")) ;
B) var handler = new CallbackHandler();
var clientFactory =
new DuplexChonnelFaccory<IService>{
typeof(CallbackHandler), new WSDualHttpBinding ()); var client =
clientFactory.CreateChannel(
new InstanceContext (handler) , new EndpointAddress ("")) ;
C) var handler = new CallbackHandler();
var clientFactory = new DuplexChannelFactory<IService>{
new WSHttpContextBinding() ;
var clienc = clientFactory.CreateChannelt
new InstanceContext (handler) , new EndpointAddress (" "));
D) var handler = new CallbackHandler();
var clientFactory = new DuplexChannelFactory<IService>{
typeof(CallbackHandler), new WSDualHttpBinding());
var client = clientFactory.CreateChannel(
new EndpointAddress ("")) ;

5. A Windows Communication Foundation (WCF) service implements the following cortract.
<ServiceContract0>? Public Interface lHeloServic e <operationContractQ> <WebGet(UriTempbte: ="helloname={name}")s Function SayHello(Byval name As String) As nng End Interface The implementation is as follows Public Class HelloService Implements IHelloService
Public Function SayHello(ByVal name As String) As String - Implements lHelloServiceSayHello
Retumn "Hello "& name
End Function
End Cesst
The service is self-hosted, and the hosting code is as follows.
Dim stHost As WebServiceHo = CreateHost()
svcHo Open()
Consde ReadLine()
svcHoaClose()
You need to implement CreateHost so that the service has a single endpoint hosted
http:/Ilocalhost8000/HeloService.
Which code segment should you use?

A) Dim baseAddress As Ur New Uri("http:/i1ocahost:8000r) Dim svcHo As WebServiceHost
=
New WebServiceHost(GetType(HelloService), baseAddress)
svc Host.AddServiceEndpoint(GdType(lHelloService),?
New Web Http Binding (WebHttpSec urityMode None),
HelloService)
Return svc Host
B) Dim svc Host As WebServiceHost = New WebServiceHost(New HelloSennceO)
svcHost.AddServiceEndpoint(GetType(IHelloService),
New WebHttpBinding(WebHttpSecurityModeNone),
Thttp://bc aihost: 8000/HelloSennce")
Return svc Host
C) Dim baseAddress As Ur = New Uri("http/I1ocahost 8OOOP Dim svcHo As
WebServiceHost = New
WebServiceHost(New HelloService0, baseAddress)
svc HostAddServiceEndpoint(GdType(IHelIoService),
New WebHttpBinding(WebHttpSecuntyMode None),
"HelloService")
Return svc Host
D) Dim svc Host As WebSennceHost = New WebServiceHost(GetType(HdloService))
svc HotsAddServiceEndpoint(GdType(lHelloService),
New WebHttpBinding(WebHttpSecurityModeNone),
"http:/Ibc alhost 8000!HelloService")
Return svc Host

Solutions: