Question

I need to accomplish something like (and they have told me explain more with lots of words…)

static MyReturnObject Function1(myObjectA parameter1, myObjectB parameter2) {...}

static void Test()
{
   Parallel.For( 0, 10, (index) =>
   {
     //create parameters y and z 
     x = Function1(y,z); 
     // Add x to an array
   });
   // Find the biggest x.
}

Code works but the result is not accurate. If i use “for” instead of “parallel.for”, i get accurate result.

Answer 1

I tried executing the code as per your rules and I am sure that it is possible to do the same.

Please find below code which I executed in an Winform application.

public partial class Form1: Form
    {
        public Form1()
        {
            InitializeComponent();
            this.Load += new EventHandler(Form1_Load);
        }

        void Form1_Load(object sender, EventArgs e)
        {
            Test();
        }

        static int Function1(int parameter1, int parameter2)
        {
            return (parameter1 + parameter2);
        }

        static void Test()
        {
            int[] nums = Enumerable.Range(0, 1000000).ToArray();
            long total = 0;

            // Use type parameter to make subtotal a long, not an int
            Parallel.For<long>(0, nums.Length, () => 0, (j, loop, subtotal) =>
            {
                subtotal += (nums[j] + Function1(1,2));
                return subtotal;
            },
                (x) => Interlocked.Add(ref total, x)
            );

            MessageBox.Show(string.Format("The total is {0}", total));
        }
    }