如何foreach二维数组的其中一列

Question

            double[,] jk = new double[5, 2];
                     .
                     .
                     .
                     .
                     .
            foreach (int x in jk)
                sum1 += x;
            foreach (int x in jk)
                sum2 += x;目的是将[,0]的列求和,然后[,1]的列求和

Answer 1

for(int i=0;i<5;i++)
{
 sum1+=j[i,0];
 sum2+=j[i,1];
}

Answer 2

个人认为这种情况并不适合用foreach

Answer 3

  double[,] jk = new double[5, 2];
                      double _Sum1 = 0;
            double _Sum2 = 0;
            int _Index =1;
            foreach (double x in jk)
            {
                if (_Index % 2 == 0)
                {
                    _Sum2 += x;                   
                }
                else
                {
                    _Sum1 += x;
                }
                _Index++;
            }