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POHow to fix a NHibernate lazy loading error "no session or session was closed"?
 

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  1. POHow to fix a NHibernate lazy loading error "no session or session was closed"?
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    <p>I'm developing a website with ASP.NET MVC, NHibernate and Fluent Hibernate and getting the error "<strong>no session or session was closed</strong>" when I try to access a child object.</p> <p>These are my domain classes:</p> <pre><code>public class ImageGallery { public virtual int Id { get; set; } public virtual string Title { get; set; } public virtual IList&lt;Image&gt; Images { get; set; } } public class Image { public virtual int Id { get; set; } public virtual ImageGallery ImageGallery { get; set; } public virtual string File { get; set; } } </code></pre> <p>These are my maps:</p> <pre><code>public class ImageGalleryMap:ClassMap&lt;ImageGallery&gt; { public ImageGalleryMap() { Id(x =&gt; x.Id); Map(x =&gt; x.Title); HasMany(x =&gt; x.Images); } } public class ImageMap:ClassMap&lt;Image&gt; { public ImageMap() { Id(x =&gt; x.Id); References(x =&gt; x.ImageGallery); Map(x =&gt; x.File); } } </code></pre> <p>And this is my Session Factory helper class:</p> <pre><code>public class NHibernateSessionFactory { private static ISessionFactory _sessionFactory; private static ISessionFactory SessionFactory { get { if(_sessionFactory == null) { _sessionFactory = Fluently.Configure() .Database(MySQLConfiguration.Standard.ConnectionString(MyConnString)) .Mappings(m =&gt; m.FluentMappings.AddFromAssemblyOf&lt;ImageGalleryMap&gt;()) .ExposeConfiguration(c =&gt; c.Properties.Add("hbm2ddl.keywords", "none")) .BuildSessionFactory(); } return _sessionFactory; } } public static ISession OpenSession() { return SessionFactory.OpenSession(); } } </code></pre> <p>Everything works fine, when I get <strong>ImageGallery</strong> from database using this code:</p> <pre><code>IImageGalleryRepository igr = new ImageGalleryRepository(); ImageGallery ig = igr.GetById(1); </code></pre> <p>But, when I try to access the <strong>Image</strong> child object with this code</p> <pre><code>string imageFile = ig.Images[1].File; </code></pre> <p>I get this error:</p> <p><strong>Initializing[Entities.ImageGallery#1]-failed to lazily initialize a collection of role: Entities.ImageGallery.Images, no session or session was closed</strong></p> <p>Someone know how can I fix this?</p> <p>Thank you very much!</p> <p><strong>Edit</strong></p> <p>My GetById method is:</p> <pre><code> public ImageGallery GetById(int id) { using(ISession session = NHibernateSessionFactory.OpenSession()) { return session.Get&lt;ImageGallery&gt;(id); } } </code></pre>
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    1. COYou forgot to post the `GetById` method which retrieves the object from database and manipulates the session.
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    2. CO@MCardinale - I see this still doesn't have an accepted answer. Did you get around this? I'm running into the same problem and the answers below aren't helping.
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