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Question 82/120
You are implementing a method named ProcessReports that performs a long-running task.
The ProcessReports() method has the following method signature:
public void ProcessReports(List<decimal> values,CancellationTokenSource cts, CancellationToken ct) If the calling code requests cancellation, the method must perform the following actions:
* Cancel the long-running task.
* Set the task status to TaskStatus.Canceled.
You need to ensure that the ProcessReports() method performs the required actions.
Which code segment should you use in the method body?
The ProcessReports() method has the following method signature:
public void ProcessReports(List<decimal> values,CancellationTokenSource cts, CancellationToken ct) If the calling code requests cancellation, the method must perform the following actions:
* Cancel the long-running task.
* Set the task status to TaskStatus.Canceled.
You need to ensure that the ProcessReports() method performs the required actions.
Which code segment should you use in the method body?
Correct Answer: B
Explanation: The CancellationToken.ThrowIfCancellationRequested method throws a OperationCanceledException if this token has had cancellation requested.
This method provides functionality equivalent to:
C#
if (token.IsCancellationRequested)
throw new OperationCanceledException(token);
Reference: CancellationToken.ThrowIfCancellationRequested Method ()
https://msdn.microsoft.com/en-
us/library/system.threading.cancellationtoken.throwifcancellationrequested(v=vs.110).aspx
This method provides functionality equivalent to:
C#
if (token.IsCancellationRequested)
throw new OperationCanceledException(token);
Reference: CancellationToken.ThrowIfCancellationRequested Method ()
https://msdn.microsoft.com/en-
us/library/system.threading.cancellationtoken.throwifcancellationrequested(v=vs.110).aspx
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