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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