●导出excel（NPOI）

//需要引用的命名空间
using NPOI.HSSF.UserModel;
string path1 = Server.MapPath(@"Muban/TCCheDuiZhang.xls");  //excel模板路径
            string filename = Session["Uid"].ToString() + DateTime.Now.ToString("yyyyMMddhhmmssms") + ".xls";  //命名新的excel文件名
            string path2 = Server.MapPath(@"Save/" + filename);  //目标位置及文件名
            // File.Copy(path1, path2);

            FileStream file = File.Open(path1, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);  //将模板读取到流中
            FileStream file1 = new FileStream(path2, FileMode.Create);  //创建一个新的流，用来保存
            HSSFWorkbook hssfworkbook = new HSSFWorkbook(file);  //excel工作簿
            file.Close();
            HSSFSheet hs = hssfworkbook.GetSheet("Sheet1") as HSSFSheet;  //要操作的表，这里是默认的第一个表

            try
            {
                var query = context.AddPersonInfo.Where(p => p.AI_Code == hfCode.Value);
                if (query.Count() > 0)
                {
                    AddPersonInfo api = query.First();
                    hs.GetRow(1).GetCell(5).SetCellValue(((DateTime)api.AI_AddDate).ToString("yyyy年MM月dd日"));  //向单元格填入数据
                    //……
                    hs.GetRow(6).GetCell(0).SetCellValue(api.AI_Aim);
                    hs.GetRow(34).GetCell(0).SetCellValue(api.AI_Guidance);
                }
            }
            catch
            {
            }
            finally
            {
                //保存
                hssfworkbook.Write(file1);
                file1.Close();  //关闭流
            }

            Response.Redirect(@"~/Save/" + filename);  //导出