c# - order of elements in Task.Factory.ContinueWhenAll

Question

The Task.Factory.ContinueWhenAll(System.Threading.Tasks.Task[] tasks, Action<System.Threading.Tasks.Task[]> continuationAction) documentation does not state that the order of elements in the continuationAction will be identical and correspond to the order of elements in the tasks input parameter. Is it possible to prove/refute this (besides looking at empirical results)?

question from:https://stackoverflow.com/questions/66052809/order-of-elements-in-task-factory-continuewhenall

Answer 1

This is implementation detail, which is subject to changes. Whatever you prove / refute, it will be per specific version of .Net and on certain hardware. There is no guarantee the order might not change in future, or even on a different platform. If the order is not documented, you must not assume any. Much better make sure you can identify your tasks and sort based on that identity for your purposes.