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| Section | Weight | Objectives |
|---|---|---|
| Creating Service Contracts | 25% | - Design data contracts
|
| Securing Services | 25% | - Control access and audit
|
| Consuming Services | 20% | - Manage client communication
|
| Configuring and Deploying Services | 30% | - Host and deploy services
|
1. 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]
02public interface ITeamMessageService
03{
04 [OperationContract]
05string GetMessage0;
07 [OperationContract]
08void PutMessage(string message);
09)
The code for the service class is as follows
10 public class TeamMessageService: ITeamMessageService
1 1{
12Guid key = GuicLNewGuidO;
1 3string message = "Today's Message":
1 4public string GetMessage()
i5{
16 return stringFormat("Message:{0} Key:{1}",
message, Key);
1n
1 9public void PutMessage(string message)
20{
2lthismessage = message;
22}
23)
The senvice is self-hosted. The hosting code is as follows.
24 ServiceHost host =
25BasicHttpBinding binding =
new BasicHttpBinding(BasicHttpSecuntyMode.None):
26 host AddServiceEndpoint(
HMyApplication lTeamMessageService, binding,
"http:/Ilocalhost: 12345w);
27 host Open0;)
You need to ensure that all clients calling GetMessage will retrieve the same string, even if the message is updated by clients calling PutMessage
What should you do?
A) Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(lnstanceContextMode = lnstanceContextModePerSession)J Then
change the binding definition on the service at line 25, and on the client to the following
WSHttpBinding binding new
WSHttpBinding(SecurityModeNone);
binding ReliableSession. Enabled true;
B) Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(lnstanceContextMode = lnstanceContextMode. Single)]
C) Redefine the message string in line 13, as follows
static string message = 'Today's Message":
Then change the implementation of PutMessage in lines 19-22 to the following
public void PutMessage(string message) { TeamMessageServicemessage message,
}
D) Pass a service instance to the instancing code in line 24, as follows.
ServiceHost host = new ServiceHost(new TeamMessageServiceO);
2. You are developing a Windows Communication Foundation (WCF) service. You write a method named Submit that accepts messages of the type System.ServiceModel.Channels.Message.
You need to process the body of the incoming messages multiple times in the method.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
A) Use the CreateMessage method of the MessageBuffer class to make a copy of the messages.
B) Use the CreateBufferedCopy method of the Message class to load the messages into memory.
C) Use the GetBody method of the Message class to read the content of the messages.
D) Use the WriteBodyContents method of the BodyWriter class to make a copy of the messages.
3. 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.)
4. You are developing a Windows Communication Foundation (WCF) service named CalculatorService, which implements the ICalculatorService contract. The service is configured to be discoverable through UDP. CalculatorService contains multiple endpoints. One of the endpoints is configured with the following behavior.
You need to log all the endpoint metadata information that is added by the service host. Which code segment should you use?
A) Option B
B) Option A
C) Option D
D) Option C
5. A Windows Communication Foundation (WCF) service is self-hosted in a console application. The service implements the IDataAccess contract, which is defined in the
MyApplication namespace.
The service is implemented in a class named DataAccessService, which implements the
IDataAccess interface and also is defined in the MyApplication namespace.
The hosting code is as follows. (Line numbers are included for reference only.)
You need to create a ServiceHost instance and assign it to the host variable. You also need to instantiate the service host.
Which line of code should you insert at line 04?
A) host = New ServiceHost("MyApplication.DataAccessService")
B) host = New ServiceHost(GetType(DataAccessService))
C) host = New ServiceHost("MyApplication.IDataAccess")
D) host = New ServiceHost(GetType(IDataAccess))
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A,B | Question # 3 Answer: Only visible for members | Question # 4 Answer: A | Question # 5 Answer: B |
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