Question

Suppose you have an array of 1000 random integer numbers and you need to loop over it to find the number 68 for example.

Using the new Parallel.For on a quad core CPU would improve speed considerably, making each core to work only 250 array items.

The question is: is it possible to interrupt the Parallel.For loop when the following condition is met?

if (integerArray[i] == 68)

   break;

Thanks.

Answer 1

If you want to stop after the current executing iteration are done (but iterations before the current WILL be executed – that is, the iterations with a lower index = i)

Parallel.For(0, 100, (i, s) =>
    {
        s.Break();
    });

or if you want to stop after the current and interations before this (in terms of index = i) should also stop

Parallel.For(0, 100, (i, s) =>
    {
        s.Stop();
    });

but in BOTH cases it is good practice to check if the work should be aborted if the iteration can take a while

s.ShouldExitCurrentIteration

read more here Parallel.For Method (Int32, Int32, Action(Int32, ParallelLoopState))