输出指定格式

Question

现在我要输出以下格式：
比如说n是一整型（n>0）
当n=3时输出
111
121
111
当n=4时输出
1111
1221
1221
1111
当n=5时输出
11111
12221
12321
12221
11111
以此类推
用c#语言写一个函数，该如何去写啊？什么样的思路啊？请教高手了，谢谢

Answer 1

                                      switch(a)
                                       {
                                           case 3:
                                               break;
                                           case 4:
                                               break;
                                           case 5:
                                               break;                                       }

Answer 2

算法没有优化，不过还是实现了那个效果哈
using System;namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            printSquare(9);
        }        private static void printSquare(int n)
        {
            for (int i = 1; i <= (1+n)/2; i++)
            {
                for (int j = 1; j <= n; j++)
                {
                    int tmp = j;
                    tmp = Math.Min(i, Math.Min(j, n - j+1));
                    Console.Write(tmp);
                }
                Console.WriteLine();
            }
            for (int i = (1 + n) / 2; i < n; i++)
            {
                for (int j = 1; j <= n; j++)
                {
                    int tmp = j;
                    tmp = Math.Min(n-i,Math.Min( j,n-j+1));
                    Console.Write(tmp);
                }
                Console.WriteLine();
            }
        }
    }
}

Answer 3

//简单优化了一下 private static void printSquare(int n)
        {
            for (int i = 1; i <= n; i++)
            {
                for (int j = 1; j <= n; j++)
                {
                    //看做数组来处理，则arr[i,j]的值为i，n - i + 1，j，n - j + 1的最小值
                    Console.Write(Math.Min(Math.Min(i, n - i + 1), Math.Min(j, n - j + 1)));
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }

Answer 4

        static void PrintList(int Length)
        {
            int m, n;
            for (int i = 1; i <= Length; i++)
            {
                for (int j = 1; j <= Length; j++)
                { 
                    m = i > Length/2 ? Length - i + 1 : i;
                    n = j > Length/2 ? Length - j + 1 : j;                    Console.Write(Math.Min(m,n));                }
                Console.WriteLine();
            }
        }