Ordered PLINQ ForAll

Question

The msdn documentation about order preservation in PLINQ states the following about ForAll().

• Result when the source sequence is ordered

Answer 1

Order preservation is usually only applied to results - i.e. the input can be processed in any order, but is returned in the original order.

As ForAll doesn't return anything, it doesn't really have any effect that I'm aware of.

The only way of making ordering apply to the processing would be to finish item 0 before processing item 1, before processing item 2 etc... at which point you've got no parallelism.