public void InterfaceProp_VsClass() { Person iP = new Person { Sex = Sex.Male }; IPeselPersonalData iPPD = iP; iPPD.Sex = Sex.Female; Console.WriteLine($"iP {iP.Sex}, iPPD {iPPD.Sex}"); }
public static bool IsValidPesel(this IPeselPersonalData pesel) { return(pesel.Sex != Sex.Undefined); }