var nums = Enumerable.Range(1,4).ToArray();            int total = 0;            Parallel.For<int>(                fromInclusive: 0,                toExclusive: nums.Length,                /* 陷阱 */                localInit: () => 1,                body: (i, loopState, subtotal) =>                {                    return subtotal + nums[i];                },                localFinally: i => Interlocked.Add(ref total, i)                );            Console.WriteLine("total={0}",total);