C# 生成订单号的几种方式

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     public class RandomNumber

     {

         public static object _lock = new object();

         public static int count = ;

         public string GetRandom1()

         {

             lock(_lock)

             {

                 if(count >= )

                 {

                     count = ;

                 }

                 var number = "P" + DateTime.Now.ToString("yyMMddHHmmss") + count.ToString("");

                 count++;

                 return number;

             }

         }

         public string GetRandom2()

         {

             lock(_lock)

             {

                 return "T" + DateTime.Now.Ticks;

             }

         }

         public string GetRandom3()

         {

             lock(_lock)

             {

                 Random ran = new Random();

                 return "U" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ran.Next(, ).ToString();

             }

         }

     }

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