public static System.IObservable <Pirac.PropertyChangingData <TProperty> > WhenPropertyChanging <TProperty>(this Pirac.IObservablePropertyChanging changing, string propertyName) { }
public static System.IObservable <Pirac.PropertyChangingData <TProperty> > WhenPropertiesChanging <TProperty>(this Pirac.IObservablePropertyChanging changing, params string[] propertyNames) { }