asp.net中Response.WriteFile()实现文件下载

   protected void Page_Load(object sender, EventArgs e)
        {
            string guidname = Request.QueryString["path"];
            string reallyname = Request.QueryString["name"];
            String FullFileName = Server.MapPath("~/Uploads/" + guidname);
            FileInfo info = new FileInfo(FullFileName);
            Response.Clear();
            Response.ClearHeaders();
            Response.Buffer = false;
            Response.ContentType = "application/octet-stream";
            Response.AppendHeader("Content-Disposition", "attachment;filename="+HttpUtility.UrlEncode(reallyname,System.Text.Encoding.UTF8).Replace("+","%20"));
            Response.AppendHeader("Content-Length", info.Length.ToString());
            Response.WriteFile(FullFileName);
      &

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