HTML解析器不会在当前上下文中退出 [英] HTML Parser does not exits in current context

问题描述

您好，伙计们，当我运行我的网站时，它提示错误HTML Parser在当前上下文中不存在，可以告诉我我在哪里做错了，我的代码是这个..

Hello, guys, when i run my website, then it give the error HTML Parser does not exits in current context, can any tell me where i am doing mistake, my code is this..

 using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;
using System.Xml;
using iTextSharp.text.html;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html.simpleparser;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using CityBusinessLogics;

    


private void Page_Load(object sender, System.EventArgs e)
    {

        lblregno.Text = Request.QueryString["Parameter"].ToString();

       
        pdfgenrate();
       // barcode();
        //print();
       
        
        
    }

public  void  pdfgenrate()
    {

        Mypage tmpPage = new Mypage(); 
        HtmlForm form = new HtmlForm();
        form.Controls.Add(Panel1 );
        tmpPage.Controls.Add(form);
        StringWriter sw = new StringWriter();
        HtmlTextWriter htmlWriter = new HtmlTextWriter(sw);
        form.Controls[0].RenderControl(htmlWriter);
        string htmlContent = sw.ToString();
        Document document = new Document();
        // step 2:
        // we create a writer that listens to the document
        // and directs a PDF-stream to a file
        PdfWriter.GetInstance(document, new FileStream("c:\\Chap0101.pdf", FileMode.Create));

        // step 3: we open the document
        document.Open();

        // step 4: we add a paragraph to the document
        //document.Add(new Paragraph(htmlContent.ToString()));

        System.Xml.XmlTextReader _xmlr = new System.Xml.XmlTextReader(new StringReader(htmlContent));

        HtmlParser.Parse(document, _xmlr);

        // step 5: we close the document
        document.Close();

        ShowPdf("c:\\Chap0101.pdf");

    }
private void ShowPdf(string s)
    {
        Response.ClearContent();
        Response.ClearHeaders();
        Response.AddHeader("Content-Disposition", "inline;filename=" + s);
        Response.ContentType = "application/pdf";
        Response.WriteFile(s);
        Response.Flush();
        Response.Clear();
    }
    public override void VerifyRenderingInServerForm(Control control)
    {
        Panel pan = control as Panel;
        if (pan != null && pan.ID == "Panle1")
            return;
        else
            base.VerifyRenderingInServerForm(control);
        /* Verifies that the control is rendered */

    }

private void ShowPdf(string s)
   {
       Response.ClearContent();
       Response.ClearHeaders();
       Response.AddHeader("Content-Disposition", "inline;filename=" + s);
       Response.ContentType = "application/pdf";
       Response.WriteFile(s);
       Response.Flush();
       Response.Clear();
   }
   public override void VerifyRenderingInServerForm(Control control)
   {
       Panel pan = control as Panel;
       if (pan != null && pan.ID == "Panle1")
           return;
       else
           base.VerifyRenderingInServerForm(control);
       /* Verifies that the control is rendered */

   }

请帮帮我.
在此先感谢

Please help me.
Thanks in advance

推荐答案

我不知道您是否从IDE复制或粘贴了代码，或者这是什么，但这看起来不正确；

I don''t know if you copied and pasted your code from your IDE or what, but this bit doesn''t look right;

form.Controls.Add(Panel1 );
tmpPage.Controls.Add(form);

在将Panel1添加到表单之前，先在哪里实例化它(然后将表单添加到页面中).在将元素添加到集合之前，您应该在一行上类似于表单和tmp页面创建的地方来创建元素，例如；

Where do you instantiate Panel1 before adding it to the form (and then add the form to the page). You should have a line somewhere similiar to your form and tmp page creation, to create the element before you add it to the collection, e.g.;

Panel Panel1 = new Panel();

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