程序代码：

Console.WriteLine("Input:");
            int n = int.Parse(Console.ReadLine());
            int[,] result = new int[n,n];

            int no = 1, direction = 0,x = 0,y=0;

            for (int i = 0; i < n * n; i++)
            {
                result[x, y] = no;
                if (direction == 0)
                {
                    if (y +1 == n || result[x,y+1]!=0)
                    {
                        direction = 1;
                        x++;
                    }
                    else
                        y++;
                }
                else if (direction == 1)
                {
                    if (x + 1 == n || result[x+1,y]!= 0)
                    {
                        direction = 2;
                        y--;
                    }
                    else
                        x++;
                }
                else if (direction == 2)
                {
                    if (y == 0 || result[x, y - 1] != 0)
                    {
                        direction = 3;
                        x--;
                    }
                    else
                        y--;
                }
                else if (direction == 3)
                {
                    if (result[x - 1, y] != 0)
                    {
                        direction = 0;
                        y++;
                    }
                    else
                        x--;
                }
                no++;
            }

            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    Console.Write(result[i, j] + "\t");
                }
                Console.WriteLine();
            }
            Console.ReadLine();