GridView导出到Pdf错误

Question

使用ITextSharp dll将Gridview转换为Pdf时出错... Gridview还包含一些产品图像。

try
{
    Response.ContentType = "application/pdf";
    Response.AddHeader("content-disposition",
    "attachment;filename=GridViewExport.pdf");
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    StringWriter sw = new StringWriter();
    HtmlTextWriter hw = new HtmlTextWriter(sw);
    Gridbill.AllowPaging = false;

    Gridbill.AllowSorting = false;

    Gridbill.DataBind();

    Gridbill.RenderControl(hw);
    StringReader sr = new StringReader(sw.ToString());
    Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
    HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
    PdfWriter.GetInstance(pdfDoc, new FileStream(Server.MapPath("~/Admin/bills/" + random.ToString() + ".pdf"), FileMode.Create));
    pdfDoc.Open();
    htmlparser.Parse(sr);
    pdfDoc.Close();
    Response.Write(pdfDoc);
    Response.End();
}
catch (Exception e)
{
    clientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + e.Message + "');", true);
}

这里，random是从（1000到int max）随机生成的数字。 我在htmlParse.parse行遇到错误。 Can Any1请帮助我并建议我进行一些修改以使其正常工作..