NHibernate ModifiedTimeStampListener

gistfile1.cs

using System;
using System.Web;
using NHibernate.Event;
using NHibernate.Persister.Entity;

namespace MyProject.Infrastructure.NHibernate.Listeners
{
    public class ModifiedTimeStampListener : IPreUpdateEventListener, IPreInsertEventListener
    {
        public bool OnPreUpdate(PreUpdateEvent @event)
        {
            var entity = @event.Entity as Entity;
            if (entity == null)
                return false;

            entity.TimeStamp = DateTime.UtcNow;
            Set(@event.Persister, @event.State, "TimeStamp", entity.TimeStamp);

            return false;

        }

        public bool OnPreInsert(PreInsertEvent @event)
        {
            var entity = @event.Entity as Entity;
            if (entity == null)
                return false;

            entity.TimeStamp = DateTime.UtcNow;
            Set(@event.Persister, @event.State, "TimeStamp", entity.TimeStamp);

            return false;
        }


        private void Set(IEntityPersister persister, object[] state, string propertyName, object value)
        {
            var index = Array.IndexOf(persister.PropertyNames, propertyName);
            if (index == -1)
                return;
            state[index] = value;
        }
    }
}