CODEWITHSUNDEEP
c#.netforeachparallel-processingparallel.foreach
Mirza Talha
Mirza Talha

Reputation: 75

Aborting Parallel.Foreach

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.

Upvotes: 0

Views: 299

Answers (1)

Lukazoid
Lukazoid

Reputation: 19416

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.

Upvotes: 1

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