int Zhongzi = int.Parse(DateTime.Now.Millisecond.ToString().Substring(DateTime.Now.Millisecond.ToString().Length-2));//设定种子获取当前时间最后两位数据
//利用计时器来获取种子
Stopwatch sw = new Stopwatch();
Random rd = new Random((int)sw.ElapsedTicks);
int i = rd.Next(0,5);