【整理】动态加载Web UserControl

protected override void OnLoad(EventArgs e)
    {
        HttpCookie login_cookie = Request.Cookies["login_cookie"];
        if (login_cookie != null && MyDAL.MyUtility.IsInArray("ucid", Request.QueryString.AllKeys))
        {
            string ucid = Request.QueryString["ucid"];
            string UCID = string.Format(@"~/uc/{0}.ascx", ucid.Replace('.', '/'));
            if (System.IO.File.Exists(Server.MapPath(UCID)))
            {
                UserControl uc = (UserControl)Page.LoadControl(UCID);
                uc.ID = "uc";
                PH_Holder.Controls.Add(uc);
            }
        }
        base.OnLoad(e);
    }