iframe继续打印最后的PDF

Question

打印按钮在调试模式下工作正常。当实施到服务器时，它会继续打印第一个文档。

使用新的打印页面生成PDF文件（如果在服务器文件夹中手动检查PDF）但是iframe继续打印旧页面。它不需要从服务器获取新的PDF。

有人可以帮助我吗？我是ASP.net的新手

a.aspx

    <form id="Form1" runat="server">
        <asp:Label ID="lbl" runat="server" Width="334px"></asp:Label>&nbsp;
        <asp:Button ID="btnPrint_Click" runat="server" Height="20px" Text="Print From Here" Width="183px" OnClick="btnPrint_Click_Click" ForeColor="Red" />
        <div title="print report">
            <rsweb:ReportViewer ID="rvViewer" runat="server" ShowParameterPrompts="false" AsyncRendering="true" 
            Width="100%" BackColor="#F7F6F3" ShowRefreshButton="true" Height="800px" ToolTip="Click the arrow to Sort" >
            </rsweb:ReportViewer>               
        </div>
    </form>

    <iframe id="frmPrint" name="IframeName" width="500" 
        height="200" runat="server" 
        style="display: none">
   </iframe>

a.aspx.cs

protected void btnPrint_Click_Click(object sender, EventArgs e)
{
    Warning[] warnings;
    string[] streamids;
    string mimeType;
    string encoding;
    string extension;

    byte[] bytes = rvViewer.ServerReport.Render("PDF", null, out mimeType,
                   out encoding, out extension, out streamids, out warnings);


    FileStream fs = new FileStream(HttpContext.Current.Server.MapPath("output.pdf"), FileMode.Create);
    fs.Write(bytes, 0, bytes.Length);
    fs.Close();

    //Open exsisting pdf
    Document document = new Document(PageSize.LETTER);
    PdfReader reader = new PdfReader(HttpContext.Current.Server.MapPath("output.pdf"));

    //Getting a instance of new pdf wrtiter
    PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(
       HttpContext.Current.Server.MapPath("Print.pdf"), FileMode.CreateNew));
    document.Open();
    PdfContentByte cb = writer.DirectContent;

    int i = 0;
    int p = 0;
    int n = reader.NumberOfPages;
    Rectangle psize = reader.GetPageSize(1);

    float width = psize.Width;
    float height = psize.Height;

    //Add Page to new document
    while (i < n)
    {
        document.NewPage();
        p++;
        i++;

        PdfImportedPage page1 = writer.GetImportedPage(reader, i);
        cb.AddTemplate(page1, 0, 0);
    }


    //Attach javascript to the document
    PdfAction jAction = PdfAction.JavaScript("this.print(true);\r", writer);
    writer.AddJavaScript(jAction);
    document.Close();

    //Attach pdf to the iframe
    frmPrint.Attributes["src"] = "Print.pdf";
}