使用“另存为”选项打开PDF文件

Question

我想打开带有“另存为”选项的PDF文件，该选项在代码下方无法正常下载PDF文件

下面是cod eon handler.asp文件。我希望将文件名传递为querystring，在这种情况下，我在代码中使用静态文件名。

是代码示例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;

public partial class en_PdfHandler : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
            string filename = Request.QueryString["fn"];
                string path = Server.MapPath("1.pdf");
                WebClient client = new WebClient();
                Byte[] buffer = client.DownloadData(path);



                if (buffer != null)
                {
                    Response.ClearContent();
                    Response.ClearHeaders();
                    Response.Buffer = true;
                    Response.ContentType = "application/pdf";
                    Response.AddHeader("Content-Disposition", "attachment; filename=1.pdf");
                    Response.AddHeader("Content-Length", buffer.Length.ToString());
                    Response.BinaryWrite(buffer);
                    Response.End();
                    Response.Flush();
                    Response.Close();
                }

        }
    }
}