如何在asp.net MVC中过滤日志

我正在使用c#和SQL Server 2005开发一个asp.net MVC 3应用程序。我想根据登录的用户类型定制我的界面。我在跟着这tuto在微软网站，我卡住了，当他在过滤器类(ActionLogFilterAttribute)中使用ActionLog实例。事实上，这个类是在"StoreDB.designer.cs"类中声明的，我没有，因为我使用实体框架的"代码优先"方法创建了我的项目。对于上下文，我只有这个类:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
using System.ComponentModel.DataAnnotations;
namespace MvcApplication2.Models
{
    public class GammeContext : DbContext
    {
        public GammeContext()
        {
          Database.SetInitializer(new DropCreateDatabaseIfModelChanges<GammeContext>());
        }
        public DbSet<Account> Accounts { get; set; }
        public DbSet<Ns_AFaire> Ns_AFaires { get; set; }
        public DbSet<Famille> Familles { get; set; }
        public DbSet<Fonction> Fonctions { get; set; }
        public DbSet<Fonction_Poste> Fonction_Postes { get; set; }
        public DbSet<Gamme> Gammes { get; set; }
        public DbSet<Historique> Historiques { get; set; }
        public DbSet<Ligne> Lignes { get; set; }
        public DbSet<Phase> Phases { get; set; }
        public DbSet<Poste> Postes { get; set; }
        public DbSet<Produit> Produits { get; set; }
        public DbSet<Profile_Ga> Profil_Gas { get; set; }
        public DbSet<Sous_Famille> Sous_Familles { get; set; }
        public DbSet<UF> UFs { get; set; }
        public DbSet<User> Users { get; set; }
        public DbSet<Num_Serie> Num_Series { get; set; }
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove<System.Data.Entity.ModelConfiguration.Conventions.PluralizingTableNameConvention>();
        }
    }
} 

这是我创建的过滤器类:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcApplication2.Models;
namespace MvcApplication2.Filters
{
    public class ActionLogFilterAttribute : ActionFilterAttribute, IActionFilter
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            GammeContext db = new GammeContext();
            ActionLog log = new ActionLog()
            {
                Controller = filterContext.ActionDescriptor.ControllerDescriptor.ControllerName,
                Action = filterContext.ActionDescriptor.ActionName,
                IP = filterContext.HttpContext.Request.UserHostAddress,
                DateTime = filterContext.HttpContext.Timestamp
            };
            db.AddToActionLogs(log);
            db.SaveChanges();
            base.OnActionExecuting(filterContext);
        }
    }
}

那么，有什么解决办法吗??