用户邮件找回密码实现

改天我在写详细注释吧，代码先贴出来，注释很明白了，应该无需多言。

  1 Controller代码：
public ActionResult ForgotPassword()
        {
            return View();
        }
        [ActionName("ForgotPassword"),HttpPost]
        public ActionResult ForgotPasswordPost(ForgotPasswordModel model)
        {
            if (ModelState.IsValid)
            {
                var user = _userDal.GetUserByName(model.Name);
                if (user == null)
                {
                    ModelState.AddModelError("","用户名不存在！");
                    return View();
                }
                if (string.IsNullOrWhiteSpace(user.Email))
                {
                    ModelState.AddModelError("", "该账户没有绑定邮箱，无法找回密码！");
                    return View();
                }
                string res=_userDal.UserFindPassword(user.ID, user.Name, user.Email, HttpContext.Request.UserHostAddress);
                if (!string.IsNullOrEmpty(res))
                {
                    ModelState.AddModelError("", res);
                    return View();
                }
                else
                {
                    ModelState.AddModelError("","邮件已发送，请注意查收！");
                    return View();
                }
            }
            return View(model);
        }

DAL层代码:
  #region 密码找回
        /// <summary>
        /// 用户找回密码功能
        /// </summary>
        /// <param name="userId">用户ID</param>
        /// <param name="userName">用户名</param>
        /// <param name="ip">用户申请找回密码时候的IP</param>
        /// <param name="email">用户的邮箱</param>
        /// <returns></returns>
        public string UserFindPassword(int userId, string userName, string email, string ip)
        {
            DateTime expirationTime = DateTime.Now.AddDays(1);//申请链接过期时间
            Random random = new Random();
            var secretKey = random.Next(100000, 999999).ToString().ToPassword();//生成随机的Key
            Web_UserFindPassword model = new Web_UserFindPassword
            {
                UserID = userId,
                UserName = userName.Trim(),
                IP = ip,
                ExpirationTime = expirationTime,
                SecretKey = secretKey
            };
            dbContext.Web_UserFindPassword.Add(model);//把申请信息存到数据库去
            dbContext.SaveChanges();
            StringBuilder sb = new StringBuilder(); sb.Append("亲爱的" + userName + "您好：<br/><br/>");
            sb.Append("点击以下链接设置新密码。<br/><br/>");
            sb.Append("<a href =\"http://www.vimi8.com/Member/FindPassword?SecretKey=" + model.SecretKey + "&UserId=" + model.UserID + "&ExpirationTime=" + model.ExpirationTime + "\">http://www.vimi8.com/Member/FindPassword?SecretKey=" + model.SecretKey + "&UserId=" + model.UserID + "&ExpirationTime=" + "&ExpirationTime=" + model.ExpirationTime + " </a><br/><br/>");
            sb.Append("(如果无法点击该URL链接地址，请将它复制并粘帖到浏览器的地址输入框，然后单击回车即可。)<br/><br/>");
            sb.Append("注意:本链接有效期24小时，过期链接将会失效。在您点击一次后失效。<br/><br/>");
            sb.Append("我们将一如既往、热忱的为您服务！<br/><br/>");
            string messageBody = sb.ToString();
            string res = MailInfo.SendMail(email, "为米网找回密码", messageBody);
            return res;
        }

        public Web_UserFindPassword GetFindPasswordModel(string secretKey, int userId, DateTime expirationTime)
        {
            return dbContext.Web_UserFindPassword.FirstOrDefault(x => x.ExpirationTime.Minute == expirationTime.Minute && x.SecretKey == secretKey && x.UserID == userId);
        }

        public void DeleteFindPasswordModel(int id)
        {
            var find = dbContext.Web_UserFindPassword.FirstOrDefault(x => x.ID == id);
            if (find != null)
            {
                dbContext.Web_UserFindPassword.Remove(find);
                dbContext.SaveChanges();
            }
        }
        #endregion

数据库设计：
using System;


    public class Web_UserFindPassword
    {
        public int ID { get; set; }
        public int? UserID { get; set; }
        public string UserName { get; set; }
        public DateTime ExpirationTime { get; set; }
        public string SecretKey { get; set; }
        public string IP { get; set; }
    }