面试题：打印蛇形二维数组

如何这样打印一个数组：

01 02 03 04 05
16 17 18 19 06
15 24 25 20 07
14 23 22 21 08
13 12 11 10 09

我的一个解答：

static void Main(string[] args)
        {
            var m = 5;
            var matrix = new int[m, m];

            var row = 0;
            var col = 0;
            matrix[row, col] = 1;

            var moveVertically = false;

            if (m <= 0)
                return;

            while (matrix[row, col] != m * m)
            {
                if (!moveVertically)
                {
                    // Detect the right cube and try to move one setp
                    if ((col + 1) < m && matrix[row, col + 1] == 0)
                    {
                        matrix[row, col + 1] = matrix[row, col] + 1;
                        col++;
                        moveVertically = false;
                        continue;
                    }

                    // Detect the left side and try to move one step
                    if ((col - 1) >= 0 && matrix[row, col - 1] == 0)
                    {
                        matrix[row, col - 1] = matrix[row, col] + 1;
                        col--;
                        moveVertically = false;
                        continue;
                    }

                    moveVertically = true;
                }

                if (moveVertically)
                {
                    // Detect up and try to move one step
                    if ((row - 1) >= 0 && matrix[row - 1, col] == 0)
                    {
                        matrix[row - 1, col] = matrix[row, col] + 1;
                        row--;
                        moveVertically = true;
                        continue;
                    }

                    // Detect the down side and try to move one step
                    if ((row + 1) < m && matrix[row + 1, col] == 0)
                    {
                        matrix[row + 1, col] = matrix[row, col] + 1;
                        row++;
                        moveVertically = true;
                        continue;
                    }

                    moveVertically = false;
                }
            }

            Print(matrix);
        }

        private static void Print(int[,] matrix)
        {
            for (var row = 0; row < matrix.GetLength(0); row++)
            {
                for (var col = 0; col < matrix.GetLength(1); col++)
                {
                    Console.Write(string.Format(" {0}", matrix[row, col].ToString("D2")));
                }
                Console.WriteLine();
            }
        }