使用NPOI 做Excel导出

1.先去官网：http://npoi.codeplex.com/下载需要引入dll 然后在网站中添加引用。
2.Asp.Net mvc导出方法
/// <summary>
        /// 导出Excel
        /// </summary>
        /// <returns></returns>
        public FileResult Excel()
        {
            var alist = WishWallServices.QueryWhere(c => c.status == 1).OrderByDescending(c=>c.WishThumbup.Where(q=>q.status==1).Count()).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("心愿墙");
            //给sheet添加第一行的头部标题
            NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
            row1.CreateCell(0).SetCellValue("微信号");
            row1.CreateCell(1).SetCellValue("姓名");
            row1.CreateCell(2).SetCellValue("心愿标题");
            row1.CreateCell(3).SetCellValue("心愿内容");
            row1.CreateCell(4).SetCellValue("点赞数");
            row1.CreateCell(5).SetCellValue("联系方式");
            row1.CreateCell(6).SetCellValue("联系地址");
            //....N行

            //将数据逐步写入sheet1各个行
            for (int i = 0; i < alist.Count; i++)
            {
                NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);
                rowtemp.CreateCell(0).SetCellValue(alist[i].WeiXinInfo.WeiXinName);
                rowtemp.CreateCell(1).SetCellValue(alist[i].name);
                rowtemp.CreateCell(2).SetCellValue(alist[i].title);
                rowtemp.CreateCell(3).SetCellValue(alist[i].content);
                rowtemp.CreateCell(4).SetCellValue(alist[i].WishThumbup.Where(q=>q.status==1).Count());
                rowtemp.CreateCell(5).SetCellValue(alist[i].phone);
                //....N行
            }
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            book.Write(ms);
            ms.Seek(0, SeekOrigin.Begin);
            return File(ms, "application/vnd.ms-excel", "心愿墙.xls");
        }