public static IObservable <EventPattern <PropertyChangedEventArgs> > ToObservable(
this INotifyPropertyChanged source, string name, bool signalInitial = true)
{
var wr = new WeakReference(source);
var observable = source.ToObservable()
.Where(e => string.IsNullOrEmpty(e.EventArgs.PropertyName) || e.EventArgs.PropertyName == name);
if (signalInitial)
{
return(Observable.Defer(
() =>
{
var current = new EventPattern <PropertyChangedEventArgs>(wr.Target, new PropertyChangedEventArgs(name));
return Observable.Return(current).Concat(observable);
}));
}
else
{
return(observable);
}
}
