public class PageBase:System.Web.UI.Page
    {
        public int PermissionID = -1;//默认-1为无限制，可以在不同页面继承里来控制不同页面的权限
         /// <summary>
        /// 构造函数
        /// </summary>
        public PageBase()
        {
            this.Load += new EventHandler(PageBase_Load);
        }
       
        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            this.Load += new System.EventHandler(PageBase_Load);
            this.Error += new System.EventHandler(PageBase_Error);
        }
        //错误处理
        protected void PageBase_Error(object sender, System.EventArgs e)
        {
            string errMsg;
            Exception currentError = Server.GetLastError();
            errMsg = "";
            errMsg +="错误地址： " + Request.Url.ToString() + "<br/>" +
                "错误信息： " + currentError.Message.ToString() + "<hr/>" +
                "<b>Stack Trace:</b><br/>" + currentError.ToString();
            Common.saveLogFiles("页面错误", errMsg);//把错误信息保存为文本文件
            Server.ClearError();

        }
        private void PageBase_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
              if (Request.Cookies["UserInfo"] == null)
                {
                    Response.Write("<script language=\"javascript\">window.top.location.href=\"login.aspx\";</script>");
                    Response.End();
                }
            }
        }



    }