System.Random r=new Random(); s1 = r.NextDouble().ToString();//0.868992506465405 s2 = r.Next().ToString();//1665548020 s3=r.Next(10).ToString();//5 s4=r.Next(1000,2000).ToString();//1885 byte[] buffer=new byte[255]; r.NextBytes(buffer); s5=buffer[254].ToString();;//207
时间间隔如果太短，创建的多个不同的Ramdom对象将具有相同的默认种子值，因而会产生几组相同的随机数。使用单个Random对象生成所有随机数可避免此问题。
System.Random r=new Random(); s1=r.Next().ToString(); s2=r.Next().ToString();
System.Random r1 = new Random(1); System.Random r2 = new Random(1); System.Random r3 = new Random(2); byte[] buffer1 = new byte[2]; byte[] buffer2 = new byte[2]; byte[] buffer3 = new byte[2]; r1.NextBytes(buffer1); r2.NextBytes(buffer2); r3.NextBytes(buffer3); s1 = String.Join(",", buffer1);//70,208 s2 = String.Join(",", buffer2);//70,208 s3 = String.Join(",", buffer3);//113,147
原文：https://www.cnblogs.com/springsnow/p/11081320.html