Programming in C# — Question 65

You are implementing a method named ProcessData that performs a long-running task. The ProcessData() method has the following method signature: public void ProcessData(List<decimal> values, CancellationTokenSource source, CancellationToken token)
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 ProcessData() method performs the required actions.
Which code segment should you use in the method body?

Answer options

• A. if (token.IsCancellationRequested)return;
• B. throw new AggregateException();
• C. token.ThrowIfCancellationRequested();
• D. source.Cancel();

Correct answer: C

Explanation

The correct answer is C because the method token.ThrowIfCancellationRequested() will throw an exception if cancellation is requested, which allows the process to terminate properly and update the status. Option A only checks for cancellation without throwing an exception, meaning the task will continue running. Option B throws an exception without checking for cancellation, and D cancels the token source but does not handle the task's cancellation directly.