public bool Add(LoadFlowResultItem item)
        {
            for (int i = 0; i < items.Count; ++i)
            {
                if (items[i].Type == item.Type)
                {
                    return(false);
                }
            }

            items.Add(item);
            return(true);
        }
        public double Get(LoadFlowResultType type)
        {
            for (int i = 0; i < items.Count; ++i)
            {
                LoadFlowResultItem item = items[i];

                if (item.Type == type)
                {
                    return(item.Value);
                }
            }

            return(double.NaN);
        }