从list[]转换为二维object[，]数组[C#]

List<int> list = new List<int>();
list.Add(1);
list.Add(2);
list.Add(3);

int rows = list.Count;
int cols = list.Count / rows;

object[,] array = new object[rows, cols];

int index = 0;
for (int i = 0; i < rows; i++)
{
    for (int j = 0; j < cols; j++)
    {
        array[i, j] = list[index];
        index++;
    }
}