.net mvc利用NPOI导入导出excel

1、导出Excel ：
首先引用NPOI包
（Action一定要用FileResult）

        /// <summary>
        /// 批量导出需要导出的列表
        /// </summary>
        /// <returns></returns>
        public FileResult ExportStu2()
        {
            //获取list数据
            var checkList = (from oc in db.OrganizeCustoms
                            join o in db.Organizes.DefaultIfEmpty() on oc.custom_id equals o.id
                            where oc.organize_id == 1
                            select new
                            {
                                customer_id = o.id,
                                customer_name = o.name
                            }).ToList();

            //创建Excel文件的对象
            NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
            //添加一个sheet
            NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1");

            //貌似这里可以设置各种样式字体颜色背景等，但是不是很方便，这里就不设置了

            //给sheet1添加第一行的头部标题
            NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
            row1.CreateCell(0).SetCellValue("编号");
            row1.CreateCell(1).SetCellValue("姓名");
            //....N行

            //将数据逐步写入sheet1各个行
            for (int i = 0; i < checkList.Count; i++)
            {
                NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);
                rowtemp.CreateCell(0).SetCellValue(checkList[i].customer_id.ToString());
                rowtemp.CreateCell(1).SetCellValue(checkList[i].customer_name.ToString());
                //....N行
            }
            // 写入到客户端 
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            book.Write(ms);
            ms.Seek(0, SeekOrigin.Begin);
            DateTime dt = DateTime.Now;
            string dateTime = dt.ToString("yyMMddHHmmssfff");
            string fileName = "查询结果" + dateTime + ".xls";
            return File(ms, "application/vnd.ms-excel", fileName);
        }

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