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我有一个应用程序，其中在 Web 表单中打开 PDF 文件，如下面的代码所示

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <div>
            <asp:FileUpload ID="FileUpload1" runat="server" />
            <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
        </div>
        <div id="divPDF" runat="server">
    <object data="<%=pdfPath%>" type="application/pdf" style="height:500px; width: "500px" >
    </object>
        </div>
    </div>
    </form>
</body>
</html>

protected string pdfPath;
protected void Page_Load(object sender, EventArgs e)
{
    divPDF.Visible = false;
}

protected void Button1_Click(object sender, EventArgs e)
{
    if (FileUpload1.FileName != "")
    {
        FileUpload1.SaveAs(Server.MapPath(FileUpload1.FileName));
        pdfPath = FileUpload1.FileName;
        divPDF.Visible = true;
    }
}

它工作正常，我可以查看和阅读pdf. 现在我需要的是当我滚动浏览当前pagenumber应该出现在文本框中的页面时。

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