When does Task.Run (Action, CancellationToken) throw a TaskCanceledException?

Question

According to the throws documentation when the task was canceled.Task.Run(Action, CancellationToken)TaskCanceledException

When exactly is Task.Run(Action, CancellationToken)throw TaskCanceledException? It is not clear what conditions must be met to exclude this exception.

Answer 1

There seems to be some confusion (and the documentation may be misleading).

Task.Run throw TaskCanceledException ( , ). ArgumentNullException ObjectDisposedException, , " " "The CancellationTokenSource, cancelationToken ". .

Task.Run a Task, CancellationToken ( ) await task, task.Wait(), task.Result .. TaskCanceledException (, AggregateException)

Task<int> task = null;
try
{
    task = Task.Run(() => 5, new CancellationToken(true));
}
catch (TaskCanceledException)
{
    Console.WriteLine("Unreachable code");
}

try
{
    int result = await task;
}
catch (TaskCanceledException)
{
    Console.WriteLine("Awaiting a canceled task");
}

, , 2 :

• "" (, ArgumentNullException ObjectDisposedException)
• "" , (, TaskCanceledException)

Answer 2

:

, .

:

. , .

, CancellationToken.IsCancelledRequested CancellationToken.ThrowIfCancelltionRequested. await .