ASP.NET 获取数据库的数据并写入到excel表格中

问题遇到的现象和发生背景

从数据库读取出数据,并且把数据写入到excel表格对应的列中

问题相关代码，请勿粘贴截图

 string fileDir = System.Web.HttpContext.Current.Server.MapPath("~/UI/BQ/Temp/测试报表.xlsx");
                
                FileStream file = new FileStream(fileDir, FileMode.Open, FileAccess.Read);
                //创建HSSFWorkbook对象
                XSSFWorkbook hssfworkbook = new XSSFWorkbook(file);
                //创建HSSFSheet对象
                NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0);
                //ISheet sheet = hssfworkbook.GetSheet("sheet1");
                System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
                DataTable dataTable;
                CustomSqlSection customSqlSection = Gateway.Default.FromCustomSql(sql);
                dataTable = customSqlSection.ToDataSet().Tables[0];
              
                     for (int i = 2; i < dataTable.Rows.Count; i++)
                {
                    sheet.GetRow(i).GetCell(0).SetCellValue(dataTable.Rows[i - 2]["VIN"].ToString());
                    sheet.GetRow(i).GetCell(1).SetCellValue(dataTable.Rows[i - 2]["CAR_TYPE_CODE"].ToString());
                    sheet.GetRow(i).GetCell(2).SetCellValue(dataTable.Rows[i - 2]["BAD_DESC"].ToString());
                    sheet.GetRow(i).GetCell(3).SetCellValue(dataTable.Rows[i-2]["Model"].ToString());
                    sheet.GetRow(i).GetCell(4).SetCellValue(dataTable.Rows[i - 2]["LEVEL_VAL"].ToString());
                    sheet.GetRow(i).GetCell(5).SetCellValue(dataTable.Rows[i - 2]["HD2"].ToString());
                    sheet.GetRow(i).GetCell(6).SetCellValue(dataTable.Rows[i - 2]["OTHER_DES"].ToString());
                   
                }