private void FileDownload()

    {

        try

        {

            string FileName = "轉入地址错误信息.txt";

            // FileName = ".//路径//文件名.扩展名";

            string FullFileName = Server.MapPath(".") + "\\轉入地址错误信息.txt";

            //FileName--要下载的文件名

            FileInfo DownloadFile = new FileInfo(FullFileName);

            //if (DownloadFile.Exists)

            //{

            Response.Clear();

            Response.ClearHeaders();

            Response.Buffer = true;

            Response.ContentType = "application/octet-stream";

            Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.UTF8));

            // Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());

            Response.WriteFile(DownloadFile.FullName);

            Response.Flush();

           

            //

        

            //}

            //else

            //{

            //    //文件不存在

            //}

        }

        catch (Exception ue)

        {

            //打开时异常了

        }

        finally

        {

            Response.End();

         

        }

    }