关于验证码的生成，本人做了一个简单的Demo！
代码如下：
1 public class RandomCode
2 {
3 /// <summary>
4 /// 这个是使用字母,数字混合
5 /// </summary>
6 /// <param name="VcodeNum"></param>
7 /// <returns></returns>
8 public static string CreateRandomCode(int codeCount)
9 {
10 string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
11 string[] allCharArray = allChar.Split(‘,‘);
12 string randomCode = "";
13 int temp = -1;
14 Random rand = new Random();
15 for (int i = 0; i < codeCount; i++)
16 {
17 if (temp != -1)
18 {
19 rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
20 }
21 int t = rand.Next(61);
22 if (temp == t)
23 {
24 return CreateRandomCode(codeCount);
25 }
26 temp = t;
27 randomCode += allCharArray[t];
28 }
29
30 return randomCode;
31 }
32 }
控制器
1 [OutputCache(Duration =5)]
2 public ActionResult Index()
3 {
4 //设置二维码是几位的
5 ViewBag.list = RandomCode.CreateRandomCode(6);
6 return View();
7 }
视图
1 <p>您的随机验证码为:</p> @ViewBag.list
原文：https://www.cnblogs.com/xuan666/p/10739988.html