var nums = Enumerable.Range(,).ToArray();

            int total = ;

            Parallel.For<int>(

                fromInclusive: ,

                toExclusive: nums.Length,

                /* 陷阱 */

                localInit: () => ,

                body: (i, loopState, subtotal) =>

                {

                    return subtotal + nums[i];

                },

                localFinally: i => Interlocked.Add(ref total, i)

                );

            Console.WriteLine("total={0}",total);