public static System.IObservable <Pirac.PropertyChangedData <TProperty> > WhenPropertyChanged <TProperty>(this Pirac.IObservablePropertyChanged changed, string propertyName) { }
public static System.IObservable <Pirac.PropertyChangedData <TProperty> > WhenPropertiesChanged <TProperty>(this Pirac.IObservablePropertyChanged changed, params string[] propertyNames) { }