/// <summary> /// 返回随机数 /// </summary> /// <param name="VcodeNum"></param> /// <returns></returns> public string RndNum(int VcodeNum) { string Vchar = "0,1,2,3,4,5,6,7,8,9"; string[] VcArray = Vchar.Split(','); string VNum = "";//由于字符串很短，就不用StringBuilder了 int temp = -1;//记录上次随机数值，尽量避免生产几个一样的随机数 //采用一个简单的算法以保证生成随机数的不同 Random rand = new Random(); for (int i = 1; i < VcodeNum + 1; i++) { if (temp != -1) { rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks)); } //int t = rand.Next(35) ; int t = rand.Next(9); if (temp != -1 && temp == t) { return RndNum(VcodeNum); } temp = t; VNum += VcArray[t]; } return VNum; }