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copied!<p>i've not ever looked at the unhaddins, but here's what i use for wcf stuff, should probably work for multithreaded general stuff too i imagine.</p> <p>this is the session context:</p> <pre><code>namespace Common.Infrastructure.WCF { public class NHibernateWcfSessionContext : ICurrentSessionContext { private readonly ISessionFactoryImplementor factory; public NHibernateWcfSessionContext(ISessionFactoryImplementor factory) { this.factory = factory; } /// <summary> /// Retrieve the current session for the session factory. /// </summary> /// <returns></returns> public ISession CurrentSession() { Lazy<ISession> initializer; var currentSessionFactoryMap = OperationContext.Current.InstanceContext.Extensions.Find<NHibernateContextManager>().SessionFactoryMaps; if (currentSessionFactoryMap == null || !currentSessionFactoryMap.TryGetValue(factory, out initializer)) { return null; } return initializer.Value; } /// <summary> /// Bind a new sessionInitializer to the context of the sessionFactory. /// </summary> /// <param name="sessionInitializer"></param> /// <param name="sessionFactory"></param> public static void Bind(Lazy<ISession> sessionInitializer, ISessionFactory sessionFactory) { var map = OperationContext.Current.InstanceContext.Extensions.Find<NHibernateContextManager>().SessionFactoryMaps;; map[sessionFactory] = sessionInitializer; } /// <summary> /// Unbind the current session of the session factory. /// </summary> /// <param name="sessionFactory"></param> /// <returns></returns> public static ISession UnBind(ISessionFactory sessionFactory) { var map = OperationContext.Current.InstanceContext.Extensions.Find<NHibernateContextManager>().SessionFactoryMaps; var sessionInitializer = map[sessionFactory]; map[sessionFactory] = null; if (sessionInitializer == null || !sessionInitializer.IsValueCreated) return null; return sessionInitializer.Value; } } } </code></pre> <p>this is the context manager :</p> <pre><code>namespace Common.Infrastructure.WCF { class NHibernateContextManager : IExtension<InstanceContext> { public IDictionary<ISessionFactory, Lazy<ISession>> SessionFactoryMaps = new Dictionary<ISessionFactory, Lazy<ISession>>(); public void Attach(InstanceContext owner) { //We have been attached to the Current operation context from the ServiceInstanceProvider } public void Detach(InstanceContext owner) { } } } </code></pre> <h2>Edit:</h2> <p>to be clear, as the other answer states, the thread static context will work out of the box. the main advantage of what i have here is 1) you get to be in control, and 2) its a lazy implementation, so you don't have to start a session for each thread if its not necessary. less connection to the db is always better, imho.</p>

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