ASP.NET MVC导出Excel

//导出excel
public FileResult Excel()
{
            //获取list数据
            var list = bll.NurseUserListExcel("", "ID asc");

            //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");

            //给sheet1添加第一行的头部标题
            NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
            row1.CreateCell(0).SetCellValue("ID");
            row1.CreateCell(1).SetCellValue("用户姓名");
            row1.CreateCell(2).SetCellValue("电话");
            row1.CreateCell(3).SetCellValue("注册时间");
            row1.CreateCell(4).SetCellValue("邀请人ID");
            row1.CreateCell(5).SetCellValue("邀请人名称");
            row1.CreateCell(6).SetCellValue("邀请人电话");
            row1.CreateCell(7).SetCellValue("总积分");
            row1.CreateCell(8).SetCellValue("已使用积分");
            row1.CreateCell(9).SetCellValue("可用积分");
            //将数据逐步写入sheet1各个行
            for (int i = 0; i < list.Count; i++)
            {
                NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);
                rowtemp.CreateCell(0).SetCellValue(list[i].ID);
                rowtemp.CreateCell(1).SetCellValue(list[i].Name);
                rowtemp.CreateCell(2).SetCellValue(list[i].Phone);
                rowtemp.CreateCell(3).SetCellValue(list[i].CreateTime.Value.ToString());
                rowtemp.CreateCell(4).SetCellValue(list[i].InviterID.Value);
                rowtemp.CreateCell(5).SetCellValue(list[i].iName);
                rowtemp.CreateCell(6).SetCellValue(list[i].iPhone);
                rowtemp.CreateCell(7).SetCellValue(list[i].IntegralSum);
                rowtemp.CreateCell(8).SetCellValue(list[i].IntegralSy);
                rowtemp.CreateCell(9).SetCellValue(list[i].IntegralKy);
            }
            // 写入到客户端 
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            book.Write(ms);
            ms.Seek(0, SeekOrigin.Begin);
            return File(ms, "application/vnd.ms-excel", "用户信息.xls");
}