C# 生成订单号的几种方式

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