Asynchronous Task.WhenAll with timeout

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You could combine the resulting Task with a Task.Delay() using Task.WhenAny():

await Task.WhenAny(Task.WhenAll(tasks), Task.Delay(timeout));

If you want to harvest completed tasks in case of a timeout:

var completedResults =
  tasks
  .Where(t => t.Status == TaskStatus.RanToCompletion)
  .Select(t => t.Result)
  .ToList();

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