文件操作

        /// <summary>
        /// 清理临时文件夹
        /// </summary>
        public void DeleteTempFile()
        {
            try
            {
                DirectoryInfo di = new DirectoryInfo(Server.MapPath("~/DataInfo"));
                int dtfd = 2;
                int.TryParse(ConfigurationManager.AppSettings["DeleteTempFileDay"].ToString(), out dtfd);

                foreach (FileInfo fi in di.GetFiles("*.txt"))
                {
                    if ((fi.CreationTime - DateTime.Now).Days > dtfd)
                    {
                        fi.Delete();
                    }
                }
                foreach (FileInfo fi in di.GetFiles("*.sav"))
                {
                    if ((fi.CreationTime - DateTime.Now).Days > dtfd)
                    {
                        fi.Delete();
                    }
                }
            }
            catch (Exception)
            {
            }
        }

/***************客户端输出 下载****************/
            Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(name));
            Response.ContentType = "application/ms-excel";// 指定返回的是一个不能被客户端读取的流，必须被下载
            Response.WriteFile(path + name); // 把文件流发送到客户端
            Response.End();
            Response.Clear();
            Response.ClearHeaders();