using System;
using System.Collections.Generic;
using System.Text;


namespace Client
{
    class Program
    {
        static void Main(string[] args)
        {
            int[,] aa=new int [3,3];
            int[,] myArr ={ { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 0 } };
            Random rad = new Random();//对Random实例化一个rad对象
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    int randId1 = rad.Next(0, 3 - i);//产生随机的下标i
                    int randId2 = rad.Next(0, 3 - j);//产生随机的下标j
                    aa[i, j] = myArr[randId1, randId2];//把产生的随机的值放到数组aa中
                    myArr[randId1, randId2] = myArr[2 - i, 2 - j];//把myArr中最后的最后一个元素的值赋给刚刚产生的那个随机的元素
                }
            }
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    Console.Write(aa[i, j]);
                }
                Console.WriteLine();
            }
            Console.Read();
        }
    }
}

哥们，认得我不？
哈哈！
又和朋友碰头了....

恩，恩，认识拼音的哦

int[] intArr = new int[9];
            ArrayList myList = new ArrayList();
            Random rnd = new Random();
            while (myList.Count < 9)
            {
                int num = rnd.Next(1, 10);
                if (!myList.Contains(num))

                    myList.Add(num);

            }
            for (int i = 0; i < 9; i++)
            {
                intArr[i] = (int)myList[i];
            }

            // 外面的循环是列出行的数字...
            /* for (int i = 0; i < 100; i += 10)
            {
            // 里面的循环是列出列的数字...
            for (int j = i; j < i + 10; j++)
            {
            Console.Write(" " + intArr[i]);
            }
            Console.WriteLine();
            }*/
            for (int i = 0; i < 9; i++)
            {
                if (i % 3 == 0)
                {
                    Console.WriteLine();
                }
                Console.Write(" " + intArr[i]);
            }

自己在发一种，各位同胞看看哈。

List<int> lst8 = new List<int>();//保存生存的随机数
            Random rd = new Random();
            for (int i = 0; i < 9; i++)       //生成9个0-8之间的随机数
            {
                lst8.Add(rd.Next(9));
            }

            foreach (int t in lst8)        //对随机数的输出
            {
                Console.Write(t);
            }

            Console.ReadLine();            //停止看看结果

经典的洗牌算法。

楼主搞的这么复杂啊？如果只是单单实现随机数的功能就random.next(9)不就行了

楼主你的程序输出的不是单个字符，而是一行一个数字
具体该法是在第二个嵌套FOR循环中
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    Console.Write(" "+aa[i, j]);      //就是这句了
                }
                Console.WriteLine();
            }