Nhibernate学习之性能改善

using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using NHibernate;using NHibernate.Cfg;namespace WebApp{    public sealed class NHibernateHelper    {        private const string CurrentSessionKey = "nhibernate.current_session";        private static readonly ISessionFactory sessionFactory;        static NHibernateHelper()        {            string cfgPath = @"E:\my project\nhibernate study\simle 1\NHibernateStudy1\NhibernateSample1\hibernate.cfg.xml";            sessionFactory = new NHibernate.Cfg.Configuration().Configure(cfgPath).BuildSessionFactory();        }        public static ISession GetCurrentSession()        {            HttpContext context = HttpContext.Current;            ISession currentSession = context.Items[CurrentSessionKey] as ISession;            if (currentSession == null)            {                currentSession = sessionFactory.OpenSession();                context.Items[CurrentSessionKey] = currentSession;            }            return currentSession;        }        public static void CloseSession()        {            HttpContext context = HttpContext.Current;            ISession currentSession = context.Items[CurrentSessionKey] as ISession;            if (currentSession == null)            {                // No current session                return;            }            currentSession.Close();            context.Items.Remove(CurrentSessionKey);        }        public static void CloseSessionFactory()        {            if (sessionFactory != null)            {                sessionFactory.Close();            }        }    }}

    System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();            sw.Start();            ISession session = NHibernateHelper.GetCurrentSession();            session.Close();            sw.Stop();            Response.Write(sw.ElapsedTicks+"<br>");            sw.Reset();            sw.Start();            session = NHibernateHelper.GetCurrentSession();            session.Close();            sw.Stop();            Response.Write(sw.ElapsedTicks + "<br>");            sw.Reset();            sw.Start();            session = NHibernateHelper.GetCurrentSession();            session.Close();            sw.Stop();            Response.Write(sw.ElapsedTicks + "<br>");