C# 将GridView导出为PDF时发生ITextSharp错误

我尝试将

GridView

导出为PDF。它给出了错误：

无法将类型为“iTextSharp.text.html.simpleparser.CellWrapper”的对象强制转换为类型为“iTextSharp.text.paragration”

它在这里抛出错误

htmlparser.Parse(sr);

---

在数据绑定和解析之前，应该禁用排序和分页

代码如下：

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);

GridView1.AllowPaging = false;     <----

GridView1.AllowSorting = false;    <----

GridView1.DataBind();

GridView1.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, Response.OutputStream);

pdfDoc.Open();

htmlparser.Parse(sr);

pdfDoc.Close();

Response.Write(pdfDoc);

Response.End(); 

Response.ContentType=“application/pdf”；
AddHeader（“内容处置”、“附件；文件名=GridViewExport.pdf”）；
Response.Cache.SetCacheability（HttpCacheability.NoCache）；
StringWriter sw=新的StringWriter（）；
HtmlTextWriter hw=新的HtmlTextWriter（sw）；
GridView1.AllowPaging=false；