public Maybe <ItInterfaceExhibit> ChangeExhibitingSystem(Maybe <ItSystem> system)
{
if (system.IsNone)
{
ExhibitedBy = null;
}
else
{
var newSystem = system.Value;
var changed =
ExhibitedBy == null ||
(newSystem.Id != ExhibitedBy.ItSystem.Id);
if (changed)
{
ExhibitedBy = new ItInterfaceExhibit
{
ItInterface = this,
ItSystem = newSystem
};
}
}
return(ExhibitedBy);
}
public bool TryGetInterfaceExhibit(out ItInterfaceExhibit interfaceExhibit, int interfaceId)
{
interfaceExhibit = ItInterfaceExhibits.FirstOrDefault(i => i.ItInterface.Id == interfaceId);
return(interfaceExhibit != null);
}