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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 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 ReplyAction property value to the endpoint address of the client.
B) On the OperationContractAttribute, set the AsyncPattern property value to true.
C) On the client, create a proxy derived from DuplexClientBase<TChannel>.
D) On the client, use GetCallbackChannel<T>.

2. You are debugging a Windows Communication Foundation (WCF) service.
The service uses signed and encrypted messages.
You need to configure logging so that you can read the contents of the messages.
What should you do?

A) Set logMessageAtTransportLevel to true.
B) Set maxMessagesToLog to 10.
C) Set maxSizeMessagesToLog to 10
D) Set logMessageAtServiceLevel to true.

3. You are developing a Windows Communication Foundation (WCF) service that contains the following service contract.

You need to ensure that RecordPayments can correctly deserialize into an Employee or a Customer object.
What should you do?

A) Add the following KnownType attributes to the Person class. [KnownType(typeof(Employee))] [KnownType(typeof(Customer))]
B) Implement the IExtension<> interface in the Person class.
C) Add the following KnownType attribute to the Employee class and to the Customer class. [KnownType(typeof(Person))]
D) Implement the IExtensibleDataObject interface in the Person class.

4. A Windows Communication Foundation (WCF) client application is consuming an RSS syndication feed from a blog. You have a SyndicationFeed variable named feed. The application iterates through the items as follows. (Line numbers are included for reference only.)
01 foreach (SyndicationItem item in feed.Items)
02 {
03 }
You need to display the content type and body of every syndication item to the console.
Which two lines of code should you insert between lines 02 and 03?

A) Console.WriteLine(item.Content.GetType()); Console.WriteLine(((TextSyndicationContent)item.Content).Text);
B) Console.WriteLine(item.Content.Type); Console.WriteLine(item.Content.ToString());
C) Console.WriteLine(item.Content.GetType()); Console.WriteLine(item.Content.ToString());
D) Console.WriteLine(item.Content.Type); Console.WriteLine(((TextSyndicationContent)item.Content).Text);

5. An ASP.NET application hosts a RESTful Windows Communication Foundation (WCF) service at /Services/Contoso.svc. The service provides a JavaScript resource to clients. You have an explicit reference to the JavaScript in your page markup as follows.
<script type="text/javaScript" src="/Services/Contoso.svc/js" />
You need to retrieve the debug version of the service JavaScript.
What should you do?

A) In the script tag, append debug to the src attribute.
B) In the script tag, add a debug attribute and set its value to true.
C) In the <%@ ServiceHost %> header for /Services/Contoso.svc, set the Debug attribute to true.
D) In the <%@ Page %> header, set the Debug attribute to true.

Solutions: