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NEW QUESTION 301
You have an assembly named Assembly1 that is written in C#. Assembly1 has a method named Method1. You add a new method named Method2 to Assembly1. Method2 is a newer version of Method1 and must be used by applications in the future. You need to ensure that if a developer builds a project that uses Method1, the developer is notified that Method1 is deprecated. What should you do?
A. Set an #if DEPRECATED preprocessor directive above Method1. Set a #endif preprocessor directive after Method1.
B. Set a #pragma warning disable preprocessor inside of Method1.
C. Mark Method1 with an ObsoleteAttribute attribute.
D. Modify Method1 to return an exception.
Answer: C
Explanation:
ObsoleteAttribute is applicable to all program elements except assemblies, modules, parameters, and return values. Marking an element as obsolete informs users that the element will be removed in future versions of the product.
https://docs.microsoft.com/en-us/dotnet/api/system.obsoleteattribute?view=netframework-4.7.2
NEW QUESTION 302
When you create an abstract method, how do you use that method in a derived class?
A. You must overload the method in your derived class.
B. You must override the method in your derived class.
C. Abstract methods cannot be used in derived classes.
D. You need to declare the method as virtual in your derived class.
Answer: B
NEW QUESTION 303
Which the following statements about the this keyword is false?
A. A constructor can use at most one this statement.
B. A constructor can use a this statement and a base statement if the base statement comes first.
C. The this keyword lets a constructor invoke a different constructor in the same class.
D. If a constructor uses a this statement, its code is executed after the invoked constructor is executed.
Answer: B
NEW QUESTION 304
How do you execute a method as a task?
A. Create a new Task object, and then call the Start method on the newly created object.
B. Create the task via the Task.Run method.
C. Create the task via the Task.Factory.StartNew method.
D. All the above.
E. None of the above.
Answer: D
NEW QUESTION 305
What is a strong name assembly?
A. An assembly with the name marked as bold.
B. An assembly with a major and minor version specified.
C. An assembly with a full version specified.
D. An assembly with the culture info specified.
E. A signed assembly.
Answer: E
NEW QUESTION 306
Which statement selects an anonymous type?
A. select { h.City, h.State }
B. select h
C. select new { h.City, h.State }
D. select h.City, h.State
Answer: C
NEW QUESTION 307
Which of the following is a valid delegate definition?
A. private delegate float MyDelegate(float);
B. private delegate MyDelegate(x);
C. private delegate MyDelegate(float x);
D. private delegate void MyDelegate(float x);
Answer: D
NEW QUESTION 308
Which properties of an ADO.NET Command object must you set to execute a stored procedure?
A. CommandTypeStoredProcedureNameParameters
B. IsStoredProcedureCommandTypeStoredProcedureNameParameters
C. CommandTypeCommandTextParameters
D. IsStoredProcedureCommandTextParameters
Answer: C
NEW QUESTION 309
Which of the following statements about statement lambdas is false?
A. A statement lambda can include more than one statement.
B. A statement lambda cannot return a value.
C. A statement lambda must use braces, { }.
D. If a statement lambda returns a value, it must use a return statement.
Answer: B
NEW QUESTION 310
Which where clause returns all integers between 10 and 20?
A. WHERE I >= 10 and I <= 20
B. WHERE I >=10 && I <= 20
C. WHERE I gt 10 and I lt 20
D. WHERE I gt 10 && I lt 20
Answer: B
NEW QUESTION 311
You are developing a class library by using C# and Visual Studio 2017. Your library must be able to process and log a series of unrelated long-running operations. You have decided to use the Task Parallel Library (TPL). Client applications call your library by passing a set of operations to perform. Your library logs and executes all of the operations while ensuring that system resources are most effectively used. It is acceptable to schedule jobs in any order, but your library must log the position of each operation. You have declared this code:
public IEnumerable<Task> Execute(System.Action[] jobs)
{
var tasks = new Task[jobs.Length]; for(int i = 0; i < jobs.Length; i++)
return tasks;
}
public void RunJob(Action job, int index)
{II implementation omitted }
You need to complete the method by inserting code in the for loop. Which code block correctly implements the requirements?
A. tasks[i] = new Task(() => RunJob(jobs[i], i));
tasks[i].Start();
B. tasks[i] = Task.Factory.StartNew(() => RunJob(jobs[i], i));
C. tasks[i] = new Task((idx) => RunJob(jobs[(int)idx], (int)idx), i);
tasks[i].Start();
D. tasks[i] = Task.Run(() => RunJob(jobs[i], i));
Answer: C
NEW QUESTION 312
You use Microsoft .NET Framework 4.5 to create an application. A custom event log named AppCenter exists. You need to write the message Invalid to the custom event log. Which code segment should you use?
A. EventLog eventLog = new EventLog(“AppCenter”);
eventLog.WriteEntryC’Invalid”);
B. EventLog eventLog = new EventLog(); if (! EventLog. SourceExists(“MySource”))
{
eventLog.CreateEventSource(“MySource”, “AppCenter”);
}
eventLog.WriteEntry(“lnvalicf);
C. if (!EventLog.SourceExists(“MySource”))
{
EventLog.CreateEventSource(“MySource”, “AppCenter”);
}
EventLog eventLog = new EventLog(“AppCenter”);
eventLog.Source=”MySource”;
eventLog.WriteEntryC’Invalid”);
D. if (! EventLog. SourceExists(“MySource”))
{
EventLog.CreateEventSource(“MySource”, “AppCenter”);
}
EventLog.WriteEntry(null, “Invalid”);
Answer: C
NEW QUESTION 313
Which where clause returns all integers between 10 and 20?
A. lt creates two collections of numbers: One contains all even numbers, and one contains all odd numbers.
B. lt creates one collection of only numbers that contain a 2.
C. It creates one collection of only numbers that are divisible by 2.
D. lt creates two collections of numbers: One contains numbers that contains a 2, and the other contains numbers that do not.
Answer: A
NEW QUESTION 314
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