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Questions et réponses: 173 Q&As
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Code d'Examen: 70-294
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NO.1 A Windows Communication Foundation (WCF) service has the following contract.
[ServiceContract(Namespace="http://contoso.com")]
public interface IShipping
{
[OperationContract]
string DoWork(int id);
}
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:addr="http://www.w3.org/2005/08/addressing">
//addr:Action[text() =
'http://contoso.com/IShipping/DoWorkResponse']
</add>
B. <add xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
//soap:Action[text() =
'http://contoso.com/IShipping/DoWorkResponse']
</add>
C. <add xmlns:addr="http://www.w3.org/2005/08/addressing">
//addr:Action[text() =
'http://contoso.com/IShipping/DoWork']
</add>
D. <add xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
//soap:Action[text() =
'http://contoso.com/IShipping/DoWork']
</add>
Answer: A
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NO.2 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(Namespace="Arithmetic")]
public class Calculator
{
[OperationContract(Action="Sum")]
public int Add(int x, int y)
{
}
}
B. [ServiceContract(ConfigurationName="Arithmetic")]
public class Calculator
{
[OperationContract(Action="Sum")]
public int Add(int x, int y)
{
}
}
C. [ServiceContract(Name="Arithmetic")]
public class Calculator
{
[OperationContract(Name="Sum")]
public int Add(int x, int y)
{
}
}
D. [ServiceContract(Name="Arithmetic")]
public class Calculator
{
[OperationContract(ReplyAction="Sum")]
public int Add(int x, int y)
{
}
}
Answer: C
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NO.3 You are consuming a Windows Communication Foundation (WCF) service in an ASP.NET Web
application. The service interface is defined as follows.
[ServiceContract]
public interface ICatalog
{
[OperationContract]
[WebGet(UriTemplate = "/Catalog/Items/{id}",
ResponseFormat = WebMessageFormat.Json)]
string RetrieveItemDescription(int id);
}
The service is hosted at /Catalog.svc.
You need to call the service using jQuery to retrieve the description of an item as indicated by a variable
named itemId.
Which code segment should you use?
A. $.get(String.format("/Catalog.svc/Catalog/Items/?id={0}", itemId)
null,
function (data) {
},
"javascript");
B. $.get(String.format("/Catalog.svc/Catalog/Items/{0}", itemId),
null,
function (data) {
},
"json");
C. $.get(String.format("/Catalog.svc/Catalog/Items/{0}", itemId),
null,
function (data) {
},
"xml");
D. $.get(String.format("/Catalog.svc/Catalog/Items/id={0}", itemId),
null,
function (data) {
},
"json");
Answer: B
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NO.4 You are developing an application to update a user ¯ s soc i a l s t a t us . You need t o consu m e t he se r v i ce
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>("SocialClient"))
{
factory.Credentials.UserName.UserName = user.Name;
factory.Credentials.UserName.Password = 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>(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);
}
Answer: A
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NO.5 A Windows Communication Foundation (WCF) service has a callback contract. You are developing a
client application that will call this service.
You must ensure that the client application can interact with the WCF service.
What should you do?
A. On the OperationContractAttribute, set the AsyncPattern property value to true.
B. On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the
client.
C. On the client, create a proxy derived from DuplexClientBase<TChannel>.
D. On the client, use GetCallbackChannel<T>.
Answer: C
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NO.6 A WCF service code is implemented as follows. (Line numbers are included for reference only.)
01 [ServiceContract]
02 [ServiceBehavior(InstanceContextMode =
03 InstanceContextMode.Single)]
04 public class CalculatorService
05 {
06 [OperationContract]
07 public double Calculate(double op1, string op, double op2)
08 {
24 }
25 }
You need to decrease the response time of the service.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution.
Choose two.)
A. Change the service behavior to the following.
[ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Multiple)]
B. Change the service behavior to the following.
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
C. Require the clients use threads, the Parallel Task Library, or other mechanism to issue service calls in
parallel.
D. Require the clients to use async operations when calling the service.
Answer: AB
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NO.7 You are creating a Windows Communication Foundation (WCF) service that is implemented as follows.
(Line numbers are included for reference only.)
01 [ServiceContract]
02 [ServiceBehavior(IncludeExceptionDetailsInFaults = true)]
03 public class OrderService
04 {
05 [OperationContract]
06 public void SubmitOrder(Order anOrder)
07 {
08 try
09 {
10
11 }
12 catch(DivideByZeroException ex)
13 {
14
15 }
16 }
17 }
You need to ensure that the stack trace details of the exception are not included in the error information
sent to the client.
What should you do?
A. Replace line 14 with the following line.
throw;
B. Replace line 14 with the following line.
throw new FaultException<Order>(anOrder, ex.ToString());
C. After line 05, add the following line.
[FaultContract(typeof(FaultException<Order>))]
Replace line 14 with the following line.
throw ex;
D. After line 05, add the following line.
[FaultContract(typeof(FaultException<Order>))]
Replace line 14 with the following line.
throw new FaultException<Order>(anOrder, "Divide by zero exception");
Answer: D
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NO.8 A Windows Communication Foundation (WCF) application uses a data contract that has several data
members.
You need the application to throw a SerializationException if any of the data members are not present
when a serialized instance of the data contract is deserialized.
What should you do?
A. Add the KnownType attribute to the data contract. Set a default value in each of the data member
declarations.
B. Add the KnownType attribute to the data contract. Set the Order property of each data member to
unique integer value.
C. Set the EmitDefaultValue property of each data member to false.
D. Set the IsRequired property of each data member to true.
Answer: D
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