mvc3全局筛选器有关问题，拒绝匿名用户访问

mvc3全局筛选器问题，拒绝匿名用户访问！
想做一内部系统，限制所有未登录用户访问，看了半天，知道要用全局筛选器，就是不知道怎么用？那位能给个例子，谢谢先

[解决办法]
<authorization>
<deny users="?" />
</authorization>
放在web.config里的<system.web>下
[解决办法]
在global里面的
public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
filters.Add(new 自定义过滤器());
}
[解决办法]

C# code

public class AuthorizeLogin : AuthorizeAttribute    {        protected override bool AuthorizeCore(HttpContextBase httpContext)        {            string url = httpContext.Request.RawUrl;            if (url.Equals("/") || url.Contains("/Home/LoginOn/") || url.Contains("/Home/CheckCode"))            {                return true;            }            if (Admin.Commom.AdminInfo.Session == null)            {                httpContext.Response.StatusCode = 404;                return false;            }            else            {                return true;            }        }        public override void OnAuthorization(AuthorizationContext filterContext)        {            base.OnAuthorization(filterContext);            if (filterContext.HttpContext.Response.StatusCode == 404)            {                filterContext.Result = new RedirectResult("/");            }        }