public async Task <IResultModel> Import(IFormFile formFile) { var oldData = await _repository.GetListAsync(m => m.IsDel == false); var data = _excelHandler.Import <MediaTypeImportModel>(formFile); var entities = _mapper.Map <List <MediaTypeEntity> >(data) .Where(m => !oldData.Select(m => m.Ext).Contains(m.Ext)).ToList(); var result = await _repository.InsertRangeAsync(entities); return(ResultModel.Result(result)); }