Creating a session ASP.NET MVC action filter

Often, a unit of work maps neatly on to a single controller action. I'll show you how to create an action filter to manage our NHibernate sessions in an ASP.NET MVC or Web API 2 application.

Getting ready

Follow the instructions in the Getting ready section of the Setting up session-per-web request recipe in the beginning of this chapter. You can name the project ActionFilterExample.

How to do it…

1. Add the NHibernateSessionAttribute class as shown in the following code:

   [AttributeUsage(AttributeTargets.Method,
   AllowMultiple=false)]
   public class NHibernateSessionAttribute 
     : ActionFilterAttribute 
   {
     public NHibernateSessionAttribute()
     {
       Order = 100;
     }
     protected ISessionFactory sessionFactory
     {
       get
       {
         return MvcApplication.SessionFactory;
       }
     }
     public override void OnActionExecuting(
       ActionExecutingContext filterContext)
     {
       var session = sessionFactory.OpenSession();
       CurrentSessionContext.Bind(session);...