public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            //  程序启动的时候注册了路由规则
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
    }

public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );
        }

 public ActionResult Index()
  {
    return View();
  }

        /// <summary>
        /// 登陆页面
        /// </summary>
        /// <returns></returns>
        public ActionResult Login()
        {
            return View();
        }
        /// <summary>
        /// "HttpPost":这个Action只会接受http post请求
        /// </summary>
        /// <param name="fc"></param>
        /// <returns></returns>
        [HttpPost]
        public ActionResult Login(FormCollection fc)
        {
            return View();
        }
        /// <summary>
        /// 注册页面
        /// </summary>
        /// <returns></returns>
        public ActionResult Register()
        {
            return View();
        }

    /// <summary>
    /// 用户信息
    /// </summary>
    public class SysUser
    {
        /// <summary>
        /// 用户ID
        /// </summary>
        public int ID { get; set; }
        /// <summary>
        /// 用户名
        /// </summary>
        public string UserName { get; set; }
        /// <summary>
        /// 密码
        /// </summary>
        public string Password { get; set; }
        /// <summary>
        /// Email
        /// </summary>
        public string Email { get; set; }
        public virtual ICollection<SysUserRole> SysUserRoles { get; set; }
    }

    /// <summary>
    /// 用户角色
    /// </summary>
    public class SysRole
    {
        /// <summary>
        /// 主键ID
        /// </summary>
        public int ID { get; set; }
        /// <summary>
        /// 角色名称
        /// </summary>
        public string RoleName { get; set; }
        /// <summary>
        /// 角色描述
        /// </summary>
        public string RoleDesc { get; set; }
        public virtual ICollection<SysUserRole> SysUserRoles { get; set; }
    }

    /// <summary>
    /// 在EF中，通常情况下一个entity set对应数据库中的一张表，一个entity对应表中的一行
    /// </summary>
    public class AccountContext : DbContext
    {
        public AccountContext() : base("AccountContext")
        {
            //指定一个连接字符串，默认情况下和类名一样，即AccountContext，我们显式的给他指定出来
        }
        public DbSet<SysUser> SysUsers { get; set; }
        public DbSet<SysRole> SysRoles { get; set; }
        public DbSet<SysUserRole> SysUserRoles { get; set; }
        /// <summary>
        /// 默认情况下会生成复数形式的表，如SysUsers,我们这里指定单数形式的表名，如SysUser
        /// </summary>
        /// <param name="modelBuilder"></param>
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        }
    }

 public class AccountInitializer : DropCreateDatabaseIfModelChanges<AccountContext>
    {
        protected override void Seed(AccountContext context)
        {
            /**
             第一次运行程序时新建数据库，插入测试数据； model改变（和database不一致）时删除重建数据库，插入测试数据。
             目前在开发阶段，不用管数据丢失的问题，直接drop and re - create比较方便。
            */
            var sysUsers = new List<SysUser>
          {
              new SysUser{UserName="张三",Password="1",Email="666666@qq.com"},
              new SysUser{UserName="李四",Password="2",Email="888888@qq.com"}
          };
            sysUsers.ForEach(s => context.SysUsers.Add(s));
            context.SaveChanges();


            var sysRoles = new List<SysRole>
          {
              new SysRole{RoleName="管理员",RoleDesc="具有所有权限"},
              new SysRole{RoleName="一般用户",RoleDesc="只有部分权限"}
          };
            sysRoles.ForEach(s => context.SysRoles.Add(s));
            context.SaveChanges();
        }
    }

  <entityFramework>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
    <contexts>
      <!--type 的值对应 （context class的完整描述，程序集）,如果你不想EF使用某个context, 可以将disableDatabaseInitialization设置为true-->
      <context type="MvcWebDemo.DAL.AccountContext,MvcWebDemo" >
        <!--type 的值对应 （initializer class 的完整描述，程序集）-->
        <databaseInitializer type="MvcWebDemo.DAL.AccountInitializer,MvcWebDemo"></databaseInitializer>
      </context>
    </contexts>
  </entityFramework>

<body>
    <div >
        @ViewBag.LoginState
    </div>
    @*<form action="~/Account/Login" method="post" class="form-horizontal">*@
    @using (Html.BeginForm("Login", "Account", FormMethod.Post))
    {
        <form class="form-horizontal">
            <div class="form-group">
                <label for="email" class="col-sm-2 control-label">Email</label>
                <div class="col-sm-10">
                    <input type="email" class="form-control" >
                </div>
            </div>
            <div class="form-group">
                <label for="pwd" class="col-sm-2 control-label">Password</label>
                <div class="col-sm-10">
                    <input type="password" class="form-control" >
                </div>
            </div>
            <div class="form-group">
                <div class="col-sm-offset-2 col-sm-10">
                    <div class="checkbox">
                        <label>
                            <input type="checkbox"> Remember me
                        </label>
                    </div>
                </div>
            </div>
            <div class="form-group">
                <div class="col-sm-offset-2 col-sm-10">
                    <button type="submit" class="btn btn-default">Sign in</button>
                </div>
            </div>
        </form>
    }
</body>　　

<form action="~/Account/Login" method="post" class="form-horizontal">