Difference between "foreach with task.Wait" and Task.WaitAll

Question

What is the difference between:

foreach(Task task in someTasks)
{
    task.Wait();
}

and

Task.WaitAll(sometasks);

In essence, looking from the end result perspective, they should be doing the same thing?

Yesterday I asked a similar question but which wasn't actually what I was looking for, because I asked it completely in a wrong way... https://stackoverflow.com/questions/22174915/task-parallel-library-difference-between-parallel-foreach-task-wait-and-tas?rq=1 — Denis Biondic, Mar 05 '14 at 07:35
I think there could be a difference when one of the tasks get cancelled or throws an exception. — Dirk, Mar 05 '14 at 07:40
hmmm perhaps that is a good point, maybe WaitAll with throw an AggregateException containing exceptions from all the Wait() calls? — Denis Biondic, Mar 05 '14 at 07:41

score 5 · Accepted Answer · edited May 23 '17 at 12:03

5

The difference is in the exception handling. If task.Wait(); throws, the foreach loop is exited. WaitAll will catch all exceptions and throw an AggregateException containing them.

Difference between "foreach with task.Wait" and Task.WaitAll

1 Answers1