Microsoft 111-056 examen pratique questions et réponses

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Code d'Examen: 111-056
Nom d'Examen: Microsoft (TS:MS.NET Framework 2.0 - Distributed Application Developm)
Questions et réponses: 240 Q&As

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NO.1 A class library named MathLib contains the following code.public class MathClass :
MarshalByRefObject { public decimal DoHugeCalculation(int iterations) { decimal result;
//Some very lengthy calculations ... return result; }}The MathLib class is hosted in a .NET
Framework remoting server application. A Windows application project running on a client
computer contains the following class.public class MathClient { public void
ProcessHugeCalculation(int iterations)
{ MathClass cm = new MathClass(); decimal decRes = cm.DoHugeCalculation(iterations);
//process the result ... }}The MathClient class must call the MathClass class asynchronously
by using remoting. A callback must be implemented to meet this requirement. You need to
complete the implementation of the MathClient class. What should you do?
A. Modify the MathClient class as follows:public class MathClient {public delegate void
DoHugeCalculationDelegate(decimal result);public event DoHugeCalculationDelegate
DoHugeCalculationResult;public void DoHugeCalculationHandler(decimal result)
{DoHugeCalculationResult(result);} public void ProcessHugeCalculation(int iterations) {
//Hook up event handler here... ... }}
B. Apply the Serializable attribute to the MathClient class.
C. Modify the MathClient class as follows:public class MathClient { private delegate decimal
DoHugeCalculationDelegate(int iterations); private void
DoHugeCalculationCallBack(IAsyncResult res) { AsyncResult aRes = (AsyncResult)res;
decimal decRes = ((DoHugeCalculationDelegate)aRes. AsyncDelegate).EndInvoke(res);
//process the result ... } public void ProcessHugeCalculation(int iterations) { MathClass cm
= new MathClass(); DoHugeCalculationDelegate del = new
DoHugeCalculationDelegate( cm.DoHugeCalculation);
del.BeginInvoke(iterations, new
AsyncCallback( DoHugeCalculationCallBack), null); }}
D. Apply the OneWay attribute to all methods in the MathClass class.
Answer: C

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NO.2 You create a .NET Framework remoting application that provides stock information to
customers. The server component raises an event on the client computer when certain conditions
are met. You need to ensure the server raises exactly one event for each client application that is
registered for the event. What should you do?
A. Configure the server class as a Singleton Server Activated Object (SAO) and check for
duplicate client delegate methods before raising the event.
B. Configure the server class as a Client Activated Object (CAO) and override the CreateObjRef
method to check for duplicate client delegate methods before raising the event.
C. Configure the server class as a SingleCall Server Activated Object (SAO) and check for
duplicate client delegate methods before raising the event.
D. Configure the server class as a Client Activated Object (CAO) and check for duplicate client
delegate methods before raising the event.
Answer: A

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NO.3 You are converting an application to use .NET Framework remoting. The server portion of the
application monitors stock prices and contains a class named StockPriceServer, which is a Server
Activated Object (SAO). The client computer interacts with the server using a common
assembly. When the server attempts to raise an event on the client computer, the server throws
the following exception.System.IO.FileNotFoundException.You discover that the event delegate
is not being called on the client computer. You need to ensure that the server application can
raise the event on the client computer. What should you do?
A. Add the Serializable attribute to the StockPriceServer class and change the event to use one of
the standard common language runtime (CLR) delegates.
B. In the common assembly, add an interface that contains the event and a method to raise the
event. Implement that interface in the StockPriceServer class and use the interface's event to
register the delegate message on the client computer.
C. Add the event delegate to the common assembly. Implement the Add delegate and the
Remove delegate methods of the event in the StockPriceServer class to reference the delegate
method in the client application.
D. Raise the event using the BeginInvoke method and pass a reference to the client computer.
Answer: B

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