1 创建一个ASP.NET MVC 项目

   添加一个 AccountController 类。

public class AccountController : Controller
    {
        [HttpGet]
        public ActionResult Login(string returnUrl)
        {
            ViewBag.ReturnUrl = returnUrl;
            return View();
        }
        [HttpPost]
        public ActionResult Login(string userName, string password,string returnUrl)
        {
            if (CheckLogin(userName, password))
            {
                //加入票据 //保存身份信息
                AccountModel ModelUser = new AccountModel() { UserName = userName, Password = password };
                string UserData = JsonConvert.SerializeObject(ModelUser);//序列化用户实体               
                FormsAuthenticationTicket Ticket = new FormsAuthenticationTicket(1, userName, DateTime.Now, DateTime.Now.AddHours(1), false, UserData);
                HttpCookie Cookie = new HttpCookie(FormsAuthentication.FormsCookieName, FormsAuthentication.Encrypt(Ticket));//加密身份信息，保存至Cookie
                Response.Cookies.Add(Cookie);
             
                if (string.IsNullOrEmpty(returnUrl))
                {
                    return Redirect("~/Home/Index");
                }
                else
                {
                    return Redirect(returnUrl);
                }
               
            }
            else
            {
                return View("Login", new ResultModel<string>() { Code = 1, Message = "用户名或密码错误" });
            }
            
        }
        public ActionResult Logout()
        {
            FormsAuthentication.SignOut();
            return RedirectToAction("Login");
        }


        private bool CheckLogin(string userName, string password)
        {
            return MvcApplication.DBList.Any(n => n.UserName == userName && n.Password == password);
        }

    }

2 添加一个 自定义attribute ，用来过滤身份登录

public class CheckLoginAttribute :ActionFilterAttribute
    {

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            //如果存在身份信息
            if (!HttpContext.Current.User.Identity.IsAuthenticated)
            {
                ContentResult Content = new ContentResult();
                string url = string.Format("{0}?returnUrl={1}", FormsAuthentication.LoginUrl, filterContext.HttpContext.Request.RawUrl);
                Content.Content = string.Format("<script type='text/javascript'>alert('请先登录！');window.location.href='{0}';</script>", url);
                filterContext.Result = Content;
            }
            //else
            //{
            //    string[] Role = CheckLogin.Instance.GetUser().Roles.Split(',');//获取所有角色
            //    if (!Role.Contains(Code))//验证权限
            //    {
            //        //验证不通过
            //        ContentResult Content = new ContentResult();
            //        Content.Content = "<script type='text/javascript'>alert('权限验证不通过！');history.go(-1);</script>";
            //        filterContext.Result = Content;
            //    }
            //}
        }
    }

3  设置 web.config ,  注意 一定要添加 mode=“Forms”

  <system.web>
     ....
    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login" name=".iamshop" ></forms>
    </authentication>
    ...
  </system.web>

4 需要添加权限验证的地方： 标记一个[CheckLogin] 属性

        [CheckLogin]
        public ActionResult Index()
        {
            //获取登录信息
            ViewBag.UserName = User.Identity.Name;
            //获取对象
           // FormsIdentity ticket = (FormsIdentity)User.Identity;
            HttpCookie authCookie = HttpContext.Request.Cookies[FormsAuthentication.FormsCookieName];//获取cookie
            FormsAuthenticationTicket Ticket = FormsAuthentication.Decrypt(authCookie.Value);//解密
           // AccountModel account = (AccountModel)JsonConvert.DeserializeObject(Ticket.UserData);//反序列化
            AccountModel account= JsonConvert.DeserializeObject<AccountModel>(Ticket.UserData);
            ViewBag.AccountName = account.UserName;
            ViewBag.Password = account.Password;

            return View();
        }

网上身份验证代码很多，参考后做的一个笔记，需要使用时，根据情况修改使用。