通过单击按钮将网页显示为 pdf

Question

我有一个新要求，即在我的网页中有一个按钮，点击后，它会将网页显示为 PDF。在研究中，我发现iTextSharp 用于此目的。 但是我的网页中也有很多Telerik 和ASP 控件。我也可以使用iTextSharp 在 PDF 中获取它吗？

如果是，那么任何人都可以提供一个基本链接以开始使用iTextSharp，因为我还没有遇到过这个工具。

根据@ahaliav 的回答，我尝试使用以下代码。但是，我没有得到 pdf 上的控件。

    protected void btnExport_Click(object sender, EventArgs e)
    {
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment;filename=TestPage.pdf");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);

        MemoryStream msOutput = new MemoryStream();
        TextReader reader = new StringReader(HtmlContent);

        // step 1: creation of a document-object
        Document document = new Document(PageSize.A4, 30, 30, 30, 30);
        HTMLWorker worker = new HTMLWorker(document);
        // step 2:
        // we create a writer that listens to the document
        // and directs a XML-stream to a file
        PdfWriter writer = PdfWriter.GetInstance(document, Response.OutputStream);

        // step 3: we create a worker parse the document

        // step 4: we open document and start the worker on the document
        document.Open();
        worker.StartDocument();

        // step 5: parse the html into the document
        worker.Parse(reader);

        // step 6: close the document and the worker
        worker.EndDocument();
        worker.Close();
        document.Close();
        //Response.Write(document);
        //Response.End();

    }
    protected override void Render(HtmlTextWriter writer)
    {
        // setup a TextWriter to capture the markup
        TextWriter tw = new StringWriter();
        HtmlTextWriter htw = new HtmlTextWriter(tw);

        // render the markup into our surrogate TextWriter
        base.Render(htw);

        // get the captured markup as a string
        string pageSource = tw.ToString();

        // render the markup into the output stream verbatim
        writer.Write(pageSource);

        // remove the viewstate field from the captured markup
        HtmlContent = Regex.Replace(pageSource,
            "<input type=\"hidden\" name=\"__VIEWSTATE\" id=\"__VIEWSTATE\" value=\".*?\" />",
            "", RegexOptions.IgnoreCase);

        // the page source, without the viewstate field, is in viewStateRemoved
        // do what you like with it

    }

请帮忙。 我还有其他选择，即当我单击按钮时显示完整网页的图像。谁能指导我解决这两个问题的任何可能方向。

我终于把我的代码改成了：

        Response.ContentType = "application/msword";
        Response.AddHeader("content-disposition", "attachment;filename=TestPage.doc");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        MemoryStream msOutput = new MemoryStream();

有了这个，我可以得到包含我所有控件的 msword 文档，但我也得到了一些不需要的文本，如果有人遇到同样的问题，我该如何删除？

Answer 1

一个非常简单的 Google 搜索将我们带到以下论坛帖子，其中包含您的“解决方案”： http://forums.asp.net/t/1039486.aspx/1

Answer 2

iTextSharp 自带小伙伴：XML Worker

如需演示，请查看here

尽管documentation 指的是Java API，但对C# 的适配应该很简单。

对于 Telerik/ASP 标签，您可以扩展 XMLWorker 并定义如何将这些标签转换为 PDF 元素。

Answer 3

经过一些研究，我没有找到在 html 中显示控件的任何解决方案，下面的代码可以正常工作，但没有显示控件， 过去我用过这个http://www.winnovative-software.com/，它适用于包括所有控件的html页面，你也可以单独测试它，“唯一”的问题是你需要为许可证付费

protected void btnExportToPdf_Click(object sender, EventArgs e)
    {
        renderPDF = true;
    }

    protected override void Render(HtmlTextWriter writer)
    {           
        if (renderPDF == true)
        {
            MemoryStream mem = new MemoryStream();
            StreamWriter twr = new StreamWriter(mem);
            HtmlTextWriter myWriter = new HtmlTextWriter(twr);
            base.Render(myWriter);
            myWriter.Flush();
            myWriter.Dispose();
            StreamReader strmRdr = new StreamReader(mem);
            strmRdr.BaseStream.Position = 0;
            string pageContent = strmRdr.ReadToEnd();
            strmRdr.Dispose();
            mem.Dispose();
            writer.Write(pageContent);
            CreatePDFDocument(pageContent);
        }
        else
        {
            StringBuilder sb = new StringBuilder();
            HtmlTextWriter tw = new HtmlTextWriter(new System.IO.StringWriter(sb));
            base.Render(tw);
            // get the captured markup as a string
            string pageSource = tw.ToString();
            //Get the rendered content
            string sContent = sb.ToString();
            //Now output it to the page, if you want
            writer.Write(sContent);
        }
    }

    public void CreatePDFDocument(string strHtml)
    {


        string strHTMLpath = Server.MapPath("MyHTML.html");
        StreamWriter strWriter = new StreamWriter(strHTMLpath, false, Encoding.UTF8);
        strWriter.Write(strHtml);
        strWriter.Close();
        string strFileName = HttpContext.Current.Server.MapPath("map1.pdf"); //    strFileName    "C:\\Inetpub\\wwwroot\\Test\\map1.pdf" 
        // step 1: creation of a document-object
        Document document = new Document();
        // step 2:
        // we create a writer that listens to the document
        PdfWriter.GetInstance(document, new FileStream(strFileName, FileMode.Create));
        StringReader se = new StringReader(strHtml);
        TextReader tr = new StreamReader(Server.MapPath("MyHTML.html"));

        //add the collection to the document
        document.Open();                        
        /////////
        iTextSharp.text.html.simpleparser.HTMLWorker worker = new iTextSharp.text.html.simpleparser.HTMLWorker(document);

        worker.StartDocument();

        //// step 5: parse the html into the document
        worker.Parse(tr);

        //// step 6: close the document and the worker
        worker.EndDocument();

        //worker.Parse(tr); // getting error "Illegal characters in path"
        document.Close();
        ShowPdf(strFileName);
    }
    public void ShowPdf(string strFileName)
    {
        Response.ClearContent();
        Response.ClearHeaders();
        Response.AddHeader("Content-Disposition", "inline;filename=" + strFileName);
        Response.ContentType = "application/pdf";
        Response.WriteFile(strFileName);
        Response.Flush();
        Response.Clear();
    }