从数组中取出不重复的值

Question

string[] str=new string[] {"12","1","45","48","78","79","44"};想从str中随机取出4个不重复的数

Answer 1

string strTemp = "";
            int times = 0;
            Random ran = new Random();
            for (int i = 0; ; i++)
            {
                int j = ran.Next(0, 6);//因为数组长度是7，所以这里范围就用0到6
                if (!strTemp.Contains(str[j]))
                {
                    strTemp += str[j] + ",";
                    times++;
                    if (times == 4)
                    {
                        break;
                    }
                }
            }
            return strTemp;

Answer 2

string[] str2 = (from a in str select a ).Distinct().Take(4).ToArray();用linq吧