使用Parallel.ForEach得到不同的求和结果

using System;
using System.Threading.Tasks;

class Program
{
    static void Main(string[] args)
    {
        int[] numbers = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        int sum = 0;

        Parallel.ForEach(numbers, () => 0, (number, loopState, localSum) =>
        {
            localSum += number;
            return localSum;
        }, localSum =>
        {
            lock (typeof(Program))
            {
                sum += localSum;
            }
        });

        Console.WriteLine($"The sum is: {sum}");
    }
}