aspx：

先创建基类

public partial class Test : System.Web.UI.Page{//这里实现load或者 OnPreInit 区别不大protected override void OnPreInit(EventArgs e){//这里进行判断if (Session["admin"] == null){this.Response.Redirect("login.aspx");return;}base.OnPreInit(e);}}

继承基类（需要判断登录的页面，统一继承Test）

public partial class _default : Test{private void Page_Load(object sender, EventArgs e){}  }

MVC:

方法一：

public class BaseWebController : BaseController{protected override void OnActionExecuting(ActionExecutingContext filterContext){if ((CurrentUser == null || CurrentUser.id == 0)){filterContext.HttpContext.Response.Redirect("/Login/Login");}base.OnActionExecuting(filterContext);}}

页面继承

 public class MyProjectController : BaseWebController{MyProjectDAL mp = new MyProjectDAL();//// GET: /MyProject/public ActionResult Index(int parentId=0){var q = mp.GetProject(CurrentUser, parentId);return View();}}

方法二：

这个就转载一下了  http://www.cnblogs.com/liuyunsheng/archive/2012/12/25/2832504.html?utm_source=tuicool&utm_medium=referral

 1     /// <summary>
 2     /// 参数过滤器
 3    /// </summary>
 4     public class ParamFilter : ActionFilterAttribute
 5     {
 6         /// <summary>
 7         /// 执行Action之前操作
 8       /// </summary>
 9         /// <param name="filterContext"></param>
10         public override void OnActionExecuting(ActionExecutingContext filterContext)
11         {
12             ///处理Action之前操作内容根据我们提供的规则来定义这部分内容
13             base.OnActionExecuting(filterContext);
14         }
15
16         /// <summary>
17         /// 执行Action之后操作
18       /// </summary>
19         /// <param name="filterContext"></param>
20         public override void OnActionExecuted(ActionExecutedContext filterContext)
21         {
22             base.OnActionExecuted(filterContext);
23         }
24     }

为Action添加ParamFilter<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">属性</span>

            [ParamFilter]public ActionResult Index(string a=null){return Content("试试看1"+(a??""));}