private IEnumerable <Layer> GetDictionaries()
 {
     try
     {
         var mapper = new MapperConfiguration(cfg => cfg.CreateMap <LayerDTO, Layer>()).CreateMapper();
         return(mapper.Map <IEnumerable <LayerDTO>, List <Layer> >(_service.GetDicts()));
     }
     catch (Exception e)
     {
         ModelState.AddModelError("", e.Message);
         return(null);
     }
 }