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copied!<p>The PersistentGenericSet is part of NHibernate (used to track changes in collections). It is based on the ISet interface and classes from Iesi.Collections, which was used to fill a gap in the .Net framework as there isn't a Set type. I guess that WCF has a problem serializing this type.</p> <p>A quick fix is to change your NHibernate mappings to use a Bag instead of a Set. Then you can use a normal <code>IList<T></code> instead of <code>Set<T></code> in your classes w.</p> <p>A better solution is to create a <a href="http://martinfowler.com/eaaCatalog/remoteFacade.html" rel="nofollow noreferrer">remote facade</a> which sends <a href="http://martinfowler.com/eaaCatalog/dataTransferObject.html" rel="nofollow noreferrer">DTOs</a> to your WCF endpoints. This will allow you to keep the interface of your internal types separate from those exposed as remote services. Jimmy Bogards <a href="http://automapper.codeplex.com/Wikipage" rel="nofollow noreferrer">Automapper</a> is a great tool which will help with the mapping process.</p> <h2>Edit</h2> <p>After re-reading the problem I had a look around the and came across this <a href="http://lunaverse.wordpress.com/2007/05/09/remoting-using-wcf-and-nhibernate/" rel="nofollow noreferrer">article</a> which describes a workaround for sending NHibernate collections over WCF. David Brion has written a good follow up <a href="http://davybrion.com/blog/2008/01/sending-nhibernate-entities-over-the-wcf-wire/" rel="nofollow noreferrer">article</a>.</p>

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