70-483 Exam Dumps | An application contains code that measures reaction times. The code runs the timer on a thread separate

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Question 61/120

An application contains code that measures reaction times. The code runs the timer on a thread separate from the user interface. The application includes the following code. (Line numbers are included for reference only.)

You need to ensure that the application cancels the timer when the user presses the Enter key.
Which code segment should you insert at line 14?

A. tokenSource.Token.Register( () => tokenSource.Cancel() );

B. tokenSource.Cancel();

C. tokenSource.IsCancellationRequested = true;

D. tokenSource.Dispose();

Correct Answer: B

Explanation: The CancellationTokenSource.Cancel method communicates a request for cancellation, and specifies whether remaining callbacks and cancelable operations should be processed.
Incorrect:
Not C: The IsCancellationRequested property is ReadOnly.
Reference: CancellationTokenSource.Cancel Method (Boolean)
https://msdn.microsoft.com/en-us/library/dd321703(v=vs.110).aspx

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