private IDisposable Subscribe(IObserver <CollectionNotification <KeyValuePair <TKey, TValue> > > observer, bool startWithExisting)
{
Contract.Requires(observer != null);
Contract.Ensures(Contract.Result <IDisposable>() != null);
lock (gate)
{
if (isDisposed)
{
return(Observable
.Throw <CollectionNotification <KeyValuePair <TKey, TValue> > >(new ObjectDisposedException("DictionarySubject<TKey, TValue>"))
.Subscribe(observer));
}
if (exception != null)
{
return(Observable
.Throw <CollectionNotification <KeyValuePair <TKey, TValue> > >(exception)
.Subscribe(observer));
}
if (startWithExisting)
{
var clonedList = dictionary.ToList().AsReadOnly();
observer.OnNext(CollectionNotification.CreateDictionaryExists(clonedList));
}
return(subject.Subscribe(observer));
}
}
