1     public class RandomNumber 2     { 3         public static object _lock = new object(); 4         public static int count = 1; 5  6         public string GetRandom1() 7         { 8             lock(_lock) 9             {10                 if(count >= 10000)11                 {12                     count = 1;13                 }14                 var number = "P" + DateTime.Now.ToString("yyMMddHHmmss") + count.ToString("0000");15                 count++;16                 return number;17             }18         }19 20 21         public string GetRandom2()22         {23             lock(_lock)24             {25                 return "T" + DateTime.Now.Ticks;26 27             }28         }29 30         public string GetRandom3()31         {32             lock(_lock)33             {34                 Random ran = new Random();35                 return "U" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ran.Next(1000, 9999).ToString();36             }37         }38     }

调用：

Response.Write("Number1:"+new RandomNumber().GetRandom1());  Response.Write("Number2:" + new RandomNumber().GetRandom2()); Response.Write("Number3:" + new RandomNumber().GetRandom3());

结果： 

Number1:P1608171449140001 

Number2:T636070421545568764 

Number3:U201608171449145562080