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

1. DRAG DROP
You have a client application that consumes a Windows Communication Foundation (WCF) service. The service contains a class named RegistrationService. The RegistrationService class contains two methods named SubmitRegistration and GetRegistrations.
The service has the following requirements:
- The client application must call the SubmitRegistration method synchronously.
- The client application must call the GetRegistrations method asynchronously.
You need to complete the client-side code to call the WCF service.
Which six code segments should you use in sequence? (To answer, move the appropriate six code segments from the list of code segments to the answer area and arrange them in the correct order.)

2. You have a Windows Communication Foundation (WCF) service that uses a multicast protocol as a custom transport. The service implements the channel framework.
You need to choose a message exchange pattern for the transport.
What should you use?

A) Duplex by using the IDuplexChannel interface for both clients and the service.
B) Half-Duplex by using the IRequestChannel interface for clients and the IReplyChannel interface for the service.
C) Request-Response by using the IRequestChannel interface for clients and the IReplyChannel interface for the service.
D) Datagram by using the IOutputChannel interface for clients and the IInputChannel interface for the service.

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) WebServiceHost svcHost = new Web Service Host(new HelloServiceO); svcHost
AddServiceEndpoint(typeof(lHelloService),
new WebHttpBinding(WebHttpSecurityMode. None),
"http://Iocalhost: 8000/HelloService");
return svcHost
B) WebServiceHost svcHost new WebServiceHost(typeof(HelloService));
svcHost.AddServiceEndpoint(typeof(lHelloService),
new WebHttpBinding(WebHttpSecurityMode None),
"http://localhost:8000/HelloService");
return svcHost;
C) 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;
D) 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;

4. You have a Windows Communication Foundation (WCF) service.
The service has issues with performance when it receives messages on a specific endpoint. The service must collect the minimum number of performance counters to diagnose the message issues.
You need to configure the service.
In the web.config file for the service, what should you do?

A) Enable message logging for the endpoint.
B) Enable the Windows Management Instrumentation (WMI) provider.
C) In the service configuration diagnostics section, set the value of the performanceCounters property to ServiceOnly.
D) In the service configuration diagnostics section, set the value of the performancCounters property to All.

5. You are developing an application to update a users social status. You need to consume the service using Windows Communication Foundation (WCF).
The client configuration is as follows.
<system.serviceModel>
<bindings>
<webHttpBinding>
<binding name="SocialConfig">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Basic"
realm="Social API" />
</security>
</binding>
</webHttpBinding>
</bindings>
<client>
<endpoint address="http://contoso.com"
binding="webHttpBinding"
bindingConfiguration="SocialConfig"
contract="ISocialStatus"
name="SocialClient" />
</client>
</system.serviceModel>
The service contract is defined as follows.
[ServiceContract] public interface ISocialStatus {
[OperationContract]
[WebInvoke(UriTemplate =
"/statuses/update.xml?status={text}")]
void UpdateStatus(string text);
}
Which code segment should you use to update the social status?

A) using (WebChannelFactory<ISocialStatus> factory =
new WebChannelFactory<ISocialStatus>(typeof(ISocialClient)))
{
factory.Credentials.Windows.ClientCredential.UserName =
user.Name;
factory.Credentials.Windows.ClientCredential.SecurePassword.
SetAt(0, Convert.ToChar(user.Password) );
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus); }
B) using (ChannelFactory<ISocialStatus> factory =
new WebChannelFactory<ISocialStatus>(typeof(ISocialStatus)))
{
factory.Credentials.UserName.UserName = user.Name;
factory.Credentials.UserName.Password = user.Password;
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus);
}
C) using (ChannelFactory<ISocialStatus> factory =
new ChannelFactory<ISocialStatus>("POST"))
{
factory.Credentials.Windows.ClientCredential.UserName =
user.Name;
factory.Credentials.Windows.ClientCredential.SecurePassword.
SetAt(0, Convert.ToChar(user.Password) );
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus); }
D) using (WebChannelFactory<ISocialStatus> factory =
new WebChannelFactory<ISocialStatus>("SocialClient"))
{
factory.Credentials.UserName.UserName = user.Name;
factory.Credentials.UserName.Password = user.Password;
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus);
}

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