Question

I am getting Invalid Operation Error in following code.

 int m = l_score.Min();

where l_score is int list.
Why this would happen ?

Edit: Code

 List<int> l_origin = new List<int>();
 List<int> l_k = new List<int>();
 List<int> l_score = new List<int>();



 for (int i = 0; i < 9; i++)
        {
            if (box_matrix[i, 5] == 0 | box_matrix[i, 5] == 1 | box_matrix[i, 5] == 2)
            {

                for (int k = 1; k < 5; k++)
                {

                    if (box_matrix[i, k] == 0)
                    {
                        int scr = 9;
                        l_origin.Add(box_matrix[i, 0]);
                        l_k.Add(k);
                        scr = score_the_move(box_matrix[i,0],k);
                        l_score.Add(scr);

                    }
                }
            }
        }


        //find the best move
       int m = l_score.Min();
       int min_index =  l_score.IndexOf(m);
       machine_line(l_origin[min_index], l_k[min_index]);
       l_origin.Clear();
       l_k.Clear();
       l_score.Clear();

Answer 1

I’m guessing l_score is empty, which is why you’re getting that exception. Look at the message of the exception to get more detail.