NHibernateActionFilter

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using CumbriaMD.Web.Controllers;
using NHibernate;
using NHibernate.Cfg;

namespace CumbriaMD.Web.Filters
{
    public class NHibernateActionFilter : ActionFilterAttribute
    {
        private static readonly ISessionFactory sessionFactory = BuildSessionFactory();

        private static ISessionFactory BuildSessionFactory()
        {
            return new Configuration()
                .Configure()
                .BuildSessionFactory();
        }

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var sessionController = filterContext.Controller as SessionController;

            if (sessionController == null)
                return;

            sessionController.Session = sessionFactory.OpenSession();
        }

        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            var sessionController = filterContext.Controller as SessionController;

            if (sessionController == null)
                return;

            var session = sessionController.Session;
            if (session == null)
                return;

            session.Dispose();
        }
    }
}