遍历IPersistentCollection项

佩德罗,

/// <summary>
/// Return the user-visible collection (or array) instance
/// </summary>
/// <returns>
/// By default, the NHibernate wrapper is an acceptable collection for
/// the end user code to work with because it is interface compatible.
/// An NHibernate PersistentList is an IList, an NHibernate PersistentMap is an IDictionary
/// and those are the types user code is expecting.
/// </returns>
object GetValue();

这样,我们可以得出结论,您可以将您的收藏转换为IEnumerable,一切都会很顺利。

我在一个袋子上做了一个小样本,这里的东西是这样的:

public void OnPostUpdateCollection(PostCollectionUpdateEvent @event)
{
    foreach (var item in (IEnumerable)@event.Collection.GetValue())
    {
        // DO WTVR U NEED
    }
}

如果需要对集合执行更复杂的操作,则可能需要集合持久器,实际上可以通过以下扩展方法获得该持久器(本质上,您需要通过 AbstractCollectionEvent.GetLoadedCollectionPersister 方法):

public static class CollectionEventExtensions
{
    private class Helper : AbstractCollectionEvent
    {
        public Helper(ICollectionPersister collectionPersister, IPersistentCollection collection, IEventSource source, object affectedOwner, object affectedOwnerId)
            : base(collectionPersister, collection, source, affectedOwner, affectedOwnerId)
        {
        }

        public static ICollectionPersister GetCollectionPersister(AbstractCollectionEvent collectionEvent)
        {
            return GetLoadedCollectionPersister(collectionEvent.Collection, collectionEvent.Session);
        }
    }

    public static ICollectionPersister GetCollectionPersister(this AbstractCollectionEvent collectionEvent)
    {
        return Helper.GetCollectionPersister(collectionEvent);
    }
}

希望有帮助!

致以最诚挚的问候,