控制台打印螺旋数组

最近园里面在聊打印螺旋数组，我业余写了一个自己的实现，如下：

 

static void Main(string[] args)
        {
            int n = 0;

            try
            {
                n = Convert.ToInt32(Console.ReadLine());
            }
            catch {
                Console.WriteLine("Error");
            }

            int[,] arr = new int[n, n];

            Spiral(n, arr);

            PrintMatrix(n, arr);

            Console.ReadLine();
        }

        //螺旋数组
        public static void Spiral(int n,int[,] matrix)
        {
            int i = 0, j = 0, m = 0, k = 0;

            for (m = 0; m < n; m++)
            {

                //方向→
                for (i = m, j = m; j < n - m; j++)
                {
                    matrix[i, j] = ++k;
                }
                j--;
                
                //方向↓
                for (i = i + 1; i < n - m; i++)
                {
                    matrix[i, j] = ++k;
                }
                i--;

                //方向←
                for (j = j - 1; j >= m; j--)
                {
                    matrix[i, j] = ++k;
                }
                j++;


                //方向↑
                for (i = i - 1; i > m; i--)
                {
                    matrix[i, j] = ++k;
                }
                i++;
            }
        }

       
        //打印
        public static void PrintMatrix(int n,int[,] matrix)
        {
            for (int a = 0; a < n; a++)
            {
                for (int b = 0; b < n; b++)
                {
                    if (matrix[a, b] < 10)
                    {
                        Console.Write("0{0} ", matrix[a, b]);
                    }
                    else
                    {
                        Console.Write("{0} ", matrix[a, b]);
                    }
                }
                Console.WriteLine();
            }
        }