Aborting Parallel.Foreach

Question

I'm using Parallel.ForEach for achieving parallelism, I was wondering is there any way that I can stop the execution of Parallel.ForEach once any one the requests complete. For example consider the following code:

IEnumerable<string> myList = new List<string>() { "admin", "admin2", "admin3" }; CancellationTokenSource _tokenSource = new CancellationTokenSource(); Parallel.ForEach(myList, admin_name => { Console.WriteLine(admin_name); });

The above code prints admin,admin2 and admin3. I want to stop further execution if any of the admin names is printed.

Is this achievable? Or is there any work around available?

I am open to suggestions and improvement.

Relevant MSDN article: How to: Cancel a Parallel.For or ForEach Loop — cbr
– cbr, Commented Mar 20, 2015 at 13:18
It's much easier using ParallelLoopState (another ForEach overload has a 2nd parameter for action). — Adriano Repetti
– Adriano Repetti, Commented Mar 20, 2015 at 13:20

Lukazoid · Accepted Answer · 2015-03-20 13:37:51Z

There is an overload of Parallel.ForEach which passes a ParallelLoopState to your delegate, this can be use to break out of the Parallel.ForEach, i.e:

Parallel.ForEach(myList, (admin_name, state) => { Console.WriteLine(admin_name); // Stop other iterations state.Stop(); });

What you will need to bear in mind is that this will not be atomic, other delegates which have already started will continue to execute, unless they explicitly check state.IsStopped.

Instead of ParallelLoopState.Stop() you may desire ParallelLoopState.Break().

Some further information about Stop() and Break() can be found at How to: Stop or Break from a Parallel.For Loop.

Could the downvoter please explain the reason for the downvote and I will try to correct any mistake I have made?

Collectives™ on Stack Overflow

Aborting Parallel.Foreach

1 Answer 1

1 Comment

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Related