I think this could be something useful for NHibernate Contrib.
Andrew C schrieb:
> HappyNomad:
>
> I got ObservableBag working with the new trunk by extending
> PersistantGenericBag and replacing the InnerBag with an
> ObservableCollection. See below:
>
> [Serializable, DebuggerTypeProxy(typeof
> (NHibernate.DebugHelpers.CollectionProxy<>))]
> public class PersistentObservableBag<T> : PersistentGenericBag<T>,
> INotifyCollectionChanged
> {
>
> public PersistentObservableBag(ISessionImplementor session)
> : base(session)
> {
> }
>
> public PersistentObservableBag(ISessionImplementor session,
> ICollection<T> coll)
> : base(session, coll)
> {
> INotifyCollectionChanged collection = coll as
> INotifyCollectionChanged;
> if (collection != null)
> {
> collection.CollectionChanged += new
> NotifyCollectionChangedEventHandler(OnCollectionChanged);
> }
> }
>
> public override void BeforeInitialize(ICollectionPersister
> persister, int anticipatedSize)
> {
> this.InternalBag = (IList<T>)
> persister.CollectionType.Instantiate(anticipatedSize);
> INotifyCollectionChanged collection = base.InternalBag as
> INotifyCollectionChanged;
> if (collection != null)
> {
> collection.CollectionChanged += new
> NotifyCollectionChangedEventHandler(OnCollectionChanged);
> }
> }
>
> protected void OnCollectionChanged(object sender,
> NotifyCollectionChangedEventArgs e)
> {
> if (CollectionChanged != null)
> CollectionChanged(this, e);
> }
>
> public event NotifyCollectionChangedEventHandler
> CollectionChanged;
>
> }
>
> public class ObservableBagType<T> : IUserCollectionType
> {
> #region IUserCollectionType Members
>
> public bool Contains(object collection, object entity)
> {
> return ((IList<T>)collection).Contains((T)entity);
> }
>
> public IEnumerable GetElements(object collection)
> {
> return (IEnumerable)collection;
> }
>
> public object IndexOf(object collection, object entity)
> {
> return ((IList<T>)collection).IndexOf((T)entity);
> }
>
> public object ReplaceElements(object original, object target,
> ICollectionPersister persister, object owner, IDictionary copyCache,
> ISessionImplementor session)
> {
> IList<T> result = (IList<T>)target;
> result.Clear();
> foreach (object item in ((IEnumerable)original))
> result.Add((T)item);
> return result;
> }
>
> // return an instance of the inner collection type
> public object Instantiate(int anticipatedSize)
> {
> return new ObservableCollection<T>();
> }
>
> public IPersistentCollection Instantiate(ISessionImplementor
> session, ICollectionPersister persister)
> {
> return new PersistentObservableBag<T>(session);
> }
>
> public IPersistentCollection Wrap(ISessionImplementor session,
> object collection)
> {
> return new PersistentObservableBag<T>(session,
> (ICollection<T>)collection);
> }
>
> #endregion
> }
>
