/// <summary>
/// Aggregates observables from <paramref name="collection"/> using selector for observables <paramref name="observablePropertySelector"/>
/// and aggregator for values from observables <paramref name="aggregator"/>
/// </summary>
public static IObservable <TRes> AggregateLatest <T, TRes>(
this ReadOnlyObservableCollection <T> collection,
Func <T, IObservable <TRes> > observablePropertySelector,
Func <IList <TRes>, TRes> aggregator)
{
return(Observable.Create <TRes>(observer =>
{
var aggregateLatestSubscription = collection.AggregateLatest(observablePropertySelector, aggregator, observer);
var collectionChangesSubscription = collection.ObserveCollectionChanges().Subscribe(_ =>
{
aggregateLatestSubscription.Dispose();
aggregateLatestSubscription = collection.AggregateLatest(observablePropertySelector, aggregator, observer);
});
return Disposable.Create(() =>
{
collectionChangesSubscription.Dispose();
aggregateLatestSubscription.Dispose();
});
}));
}
