public virtual void AddChoice(ChoiceRow choice)
{
if (choice == null)
{
throw new ArgumentNullException(nameof(choice));
}
this.choices[choice.Id] = choice;
}
public static bool IsNullOrNone(this ChoiceRow self) => self == null || self == ChoiceRow.None;
public sealed override void AddChoice(ChoiceRow option)
{
}