PLinq vs Parallel.For(each)

As a summary taken from here.

Both approaches work the same way: the initial collection is split up intro smaller chunks (partitions) and the operations are performed on them, in parallel (probably).

Use PLinq when:

• when there is a need of composition, Linq like constructs are easier to reason about
• when order is important

Movies.AsParallel().AsOrdered().Select(…)

 

Use Parallel.For(each)

• the data is simple in nature and the actions are independent
• when operations need to maintain thread-local state
• when you need to break out of the iteration; this can be done either by calling the Break or Stop methods on the ParallelLoopState class