MVC使用Controller代替Filter完成登录验证（Session校验

using System.Web.Mvc;

namespace PMS.WebApp.Models
{
  public class CheckLoginAttribute:ActionFilterAttribute
  {
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
      base.OnActionExecuting(filterContext);
      if (filterContext.HttpContext.Session == null || filterContext.HttpContext.Session["user"] == null)
      {
        filterContext.HttpContext.Response.Redirect("/User/Login");
      }
    }
  }
}

using System.Web.Mvc;
using PMS.IBLL;
using PMS.WebApp.Models;

namespace PMS.WebApp.Controllers
{
  public class UserController : Controller
  {
    //
    // GET: /User/
    //private IUserService _userService;
    //private IUserService UserService
    //{
    //  get { return _userService ?? (_userService = new UserService()); }
    //  set { _userService = value; }
    /