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c# - 转换为 PDF 时出错 : The document has no pages at document. close()

转载 作者：行者123 更新时间：2023-11-30 17:14:51 25 4
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我用于将数据面板转换为 PDF 的以下代码。但它给出了一个错误:

The document has no pages at the place of document.close()

这是我的代码:

protected void ConvertPDF_click(object sender, EventArgs e)
{
    string attachment = "attachment; filename=test.pdf";
    Response.ClearContent();
    Response.AddHeader("content-disposition", attachment);
    Response.ContentType = "application/pdf";
    StringWriter stw = new StringWriter();
    HtmlTextWriter htextw = new HtmlTextWriter(stw);
    htextw.AddStyleAttribute("font-size", "7pt");
    htextw.AddStyleAttribute("color", "Black");

    Panel1.RenderControl(htextw);//Name of the Panel
    Document document = new Document();
    document = new Document(PageSize.A4, 5, 5, 15, 5);
    FontFactory.GetFont("Arial", 50, iTextSharp.text.BaseColor.BLUE);
    PdfWriter.GetInstance(document, Response.OutputStream);
    document.Open();

    StringReader str = new StringReader(stw.ToString());
    HTMLWorker htmlworker = new HTMLWorker(document);
    htmlworker.Parse(str);

    document.Close();
    Response.Write(document);
}

最佳答案

看不到您的Panel 服务器控件中有什么，但您的代码看起来没问题。如果 Panel 仅包含简单的 HTML，则您不一定需要将 HTML IElement 对象单独添加(在调用 HTMLWorker.ParseToList() 时)到 Document @VahidN 建议的对象。这是一个简单的示例 - .aspx 文件:

<%@ Page Language='C#' AutoEventWireup='true' CodeFile='panelTest.aspx.cs' Inherits='panelTest' %>
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>
<html xmlns='http://www.w3.org/1999/xhtml'>
<head runat='server'><title></title></head>
<body><form id='form1' runat='server'>
<asp:Panel ID='testPanel' runat='server'>
<h1>A H1 Heading</h1>
<table width='100%' border='1' align='center' 
  cellpadding='4' cellspacing='0' 
>
<tr><td>TABLE ROW 1: CELL 1</td></tr>
<tr><td>TABLE ROW 2: CELL 1</td></tr>
</table>
<p>A Paragraph with <strong>bold</strong> and <em>italic</em> text.</p>
</asp:Panel>
<asp:Button runat='server'
  oncommand='process'
  text='Convert HtmlControl to PDF'
/>
</form></body></html>

代码隐藏文件:

using System;
using System.IO;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html.simpleparser;

public partial class panelTest : Page {
  protected void process(object sender, CommandEventArgs e) {
    string attachment = "attachment; filename=test.pdf";
    Response.AddHeader("content-disposition", attachment);    
    Response.ContentType = "application/pdf";
    StringWriter stringWriter = new StringWriter();
    HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);
    htmlWriter.AddStyleAttribute("font-size", "10pt");
    htmlWriter.AddStyleAttribute("color", "Black");      
    testPanel.RenderControl(htmlWriter);
    using (Document document = new Document()) {
      PdfWriter.GetInstance(document, Response.OutputStream);
      document.Open();
      StringReader stringReader = new StringReader(stringWriter.ToString());
      HTMLWorker htmlworker = new HTMLWorker(document);
      htmlworker.Parse(stringReader);    
    }
    Response.End();
  }
}

话虽如此 - 如果面板包含子控件或复杂的 HTML(例如图像)，您将遇到问题。您需要考虑到 HTMLWorker 是一个非常简单的解析器。

关于c# - 转换为 PDF 时出错 : The document has no pages at document. close()，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8355308/

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