Returning the Sum of 2 Dimensional Array elements from DLL C#

Question

I am trying to return the sum of the elements of a 2 dimensional array from my DLL, but can't seem to get it to work correctly. The returning integer which should be the 'sum' of the array elements returns a null. Could use some advice...

                int[,] array2D = new int[,] { { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };

                Class1.arraySum(array2D);
                Console.WriteLine("Sum of 2D Array of numbers ({ 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 })\n");
                Console.WriteLine(sum);

DLL

public static int arraySum(int[,] values)
    {
        int sum = values.Cast<int>().Sum();
        return sum;
    }

user3598756 · Accepted Answer · 2017-02-18 17:28:21Z

1

you have to declare and fill the sum variable

        int sum = Class1.arraySum(array2D);
        Console.WriteLine("Sum of 2D Array of numbers ({ 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 })\n");
        Console.WriteLine(sum);

or write it down "on the fly":

        Console.WriteLine("Sum of 2D Array of numbers ({ 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 })\n");
        Console.WriteLine(Class1.arraySum(array2D));

edited Feb 18, 2017 at 17:28

answered Feb 18, 2017 at 17:18

user3598756

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3 Comments

Justin Over a year ago

So that doesn't send it to my DLL however. I want to have my DLL perform the sum method and then return the value

user3598756 Over a year ago

I missed the Class1 reference I took off for my test, see edited answer.

user3598756 Over a year ago

BTW you could reduce your arraySum() method body to one line return values.Cast<int>().Sum();

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