c# - Proper way to use LINQ with CancellationToken -



c# - Proper way to use LINQ with CancellationToken -

i trying write linq query back upwards cancellation using cancellationtoken mechanism provided in .net framework. however, it's unclear proper way combine cancellation , linq be.

with plinq, it's possible write:

var resultsequence = sourcesequence.asparallel() .withcancellation(cancellationtoken) .select(myexpensiveprojectionfunction) .tolist();

unfortunately, withcancellation() applies parallelenumerable - can't used plain old linq query. it's possible, of course, utilize withdegreeofparallelism(1) turn parallel query sequential 1 - hack:

var resultsequence = sourcesequence.asparallel() .withdegreeofparallelism(1) .withcancellation(cancellationtoken) .select(myexpensiveprojectionfunction) .tolist();

i avoid creating separate task operation, need in several places, , need able command thread code runs on in instances.

so, short of writing own implementation of withcancellation() - there alternative accomplish same thing?

how approach?

var resultsequence = sourcesequence.withcancellation(cancellationtoken) .select(myexpensiveprojectionfunction) .tolist(); static class cancelextention { public static ienumerable<t> withcancellation<t>(this ienumerable<t> en, cancellationtoken token) { foreach (var item in en) { token.throwifcancellationrequested(); yield homecoming item; } } }

c# .net linq parallel-processing cancellation

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