/// <summary>        /// 下载文件        /// </summary>        /// <param name="FullFileName"></param>        public static void FileDownload(string FullFileName)        {            FileInfo DownloadFile = new FileInfo(FullFileName); //设置要下载的文件                       HttpContext.Current.Response.Clear(); //清除缓冲区流中的所有内容输出             HttpContext.Current.Response.ClearHeaders(); //清除缓冲区流中的所有头             HttpContext.Current.Response.Buffer = false; //设置缓冲输出为false            //设置输出流的 HTTP MIME 类型为application/octet-stream             HttpContext.Current.Response.ContentType = "application/octet-stream";            //将 HTTP 头添加到输出流            string s = HttpUtility.UrlEncode(System.Text.UTF8Encoding.UTF8.GetBytes(DownloadFile.Name));            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + s);// HttpUtility.UrlEncode(DownloadFile.Name, System.Text.Encoding.UTF8));            HttpContext.Current.Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());            //将指定的文件直接写入 HTTP 内容输出流。            HttpContext.Current.Response.WriteFile(DownloadFile.FullName);            HttpContext.Current.Response.Flush(); //向客户端发送当前所有缓冲的输出            HttpContext.Current.Response.End(); //将当前所有缓冲的输出发送到客户端        }

string path = "/UploadFile/Template/ImportApplyInfo.xlsx";//目录为当前web下目录FileDownload(this.Server.MapPath(path));