That still sounds like getters/setters, then (which you could use to implement properties-as-a-hash-map, for example). Maybe the ergonomics are different - we'r

That still sounds like getters/setters, then (which you could use to implement properties-as-a-hash-map, for example). Maybe the ergonomics are different - we're still speaking pretty abstractly here so it's hard to tell - but it sounds like the same basic idea: class TimePeriod { private double _seconds; public double Hours { get { return _seconds / 3600; } set { if (value < 0 || value > 24) throw new ArgumentOutOfRangeException( $"{nameof(value)} must be between 0 and 24."); _seconds = value * 3600; } } }