<system.web>
  <authentication mode="Forms">
   <forms loginUrl="~/Login/Index" timeout="2880" defaultUrl="~/Home/Index"/>
  </authentication>
  <anonymousIdentification enabled="true"/>
  <authorization>
   <deny users=""/> <!--拒绝匿名访问-->
  </authorization>
  <compilation debug="true" targetFramework="4.5" />
  <httpRuntime targetFramework="4.5" />
  <httpModules>
   <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" />
  </httpModules>
 </system.web>

 <location path="Login"> <!--这里的意思就是LoginController下的方法可以匿名访问-->
  <system.web>
   <authorization>
    <allow users="*" /> <!--允许匿名访问-->
   </authorization>
  </system.web>
 </location>

 public bool ValidateUser(LoginVO model)
    {
      string encodePassword = MD5(model.PassWord);//加密
      string sql =
        "select * from User_Users where (UserName=@UserName or JobNumber=@JobNumber) and PassWord=@PassWord";
      var user = Context.Data.Query<UsersPO>(sql,
        new {UserName = model.LoginName, JobNumber = model.LoginName, PassWord = encodePassword}).SingleOrDefault();
      if (user == null) return false;
      DateTime expiration = model.IsRememberLogin //是否记住密码
        "Admin" … /> 的 users 属性
        DateTime.Now, //发布时间
        expiration,//失效时间
        true,//是否为持久 Cookie
        user.UserId.ToString(), //用户数据：可用 ((System.Web.Security.FormsIdentity)(HttpContext.Current.User.Identity)).Ticket.UserData 获取
        FormsAuthentication.FormsCookiePath //指定 Cookie 为 Web.config 中 <forms path="/" … /> path 属性，不指定则默认为“/”
        );
      var encryptedTicket = FormsAuthentication.Encrypt(ticket);
      if (HttpContext.Current.Request.Cookies[FormsAuthentication.FormsCookieName] != null)
      {
        HttpContext.Current.Request.Cookies.Remove(FormsAuthentication.FormsCookieName);
      }
      var loginIdentify=new HttpCookie(FormsAuthentication.FormsCookieName);
      if (model.IsRememberLogin)
      {
        loginIdentify.Expires = DateTime.Now.AddDays(7);
      }
      loginIdentify.Value = encryptedTicket;
      HttpContext.Current.Response.AppendCookie(loginIdentify);//添加Cookie
      return true;
    }

    /// <summary>
    /// 加密
    /// </summary>
    /// <param name="str"></param>
    /// <param name="encoding"></param>
    /// <param name="toUpper"></param>
    /// <param name="isReverse"></param>
    /// <param name="count"></param>
    /// <returns></returns>
    private string MD5(string str, Encoding encoding=null, int count = 1)
    {
      if (encoding == null)
      {
        encoding = Encoding.Default;
      }
      var bytes = new MD5CryptoServiceProvider().ComputeHash(encoding.GetBytes(str));
      var md5 = string.Empty;
      for (int i = 0; i < bytes.Length; i++)
      {
        md5 += bytes[i].ToString("x").PadLeft(2, '0');
      }     
      if (count <= 1) { return md5; }
      return MD5(md5, encoding, --count);
    }