public void Add(IBackable backable)
{
if (backable == null)
{
throw new ArgumentNullException("Backable can't be null");
}
var position = _backables.FindIndex(item => item == backable);
if (position >= 0)
{
if (position < (_backables.Count - 1))
{
_backables.RemoveAt(position);
_backables.Add(backable);
}
}
else
{
_backables.Add(backable);
}
}
public void Remove(IBackable obj)
{
_backables.Remove(obj);
}
