public List <Model.Stack> StackSer(DateTime currtime, DateTime begtime)
        {
            var res = dal.QueryWhere(s => s.DateTime >= begtime && s.DateTime <= currtime).GroupBy(g => new { g.StationID, g.EquipID }).Select(f => new
            {
                staid = f.Key.StationID,
                equid = f.Key.EquipID,
                upi   = Math.Round((decimal)f.Average(u => u.UPI), 3)
            });

            List <Model.Stack> stackres = new List <Model.Stack>();
            int count = 1;

            // Regex.Replace(item.equipId, "[A-Z0]", "") + "#"
            foreach (var item in res)
            {
                Model.Stack stack = new Model.Stack()
                {
                    Number = item.upi,
                    Str    = count.ToString() + "#"
                };
                count++;
                stackres.Add(stack);
            }
            return(stackres);
        }