CSS样式未使用iTextSharp应用于PDF

Question

我试图使用iTextSharp将我的网页的一部分转换为pdf,虽然pdf生成工作正常,但没有应用任何css样式.我尝试过一次一个地应用这些样式,但这似乎不起作用.这是我到目前为止所提出的:

//Get the portion of the page to convert.
StringBuilder sb = new StringBuilder();
print_div.RenderControl(new HtmlTextWriter(new StringWriter(sb)));
string html = sb.ToString();

//Generate a random filename to use for the pdf
Guid random_guid;
random_guid = Guid.NewGuid();
string fileName = random_guid.ToString() + ".pdf";
string filename_with_folder = @"pdf\sl_" + fileName;
string fullFilePath = System.IO.Path.Combine(Request.PhysicalApplicationPath, filename_with_folder);

using (Document doc = new Document())
{
    // Create the pdf
    PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(fullFilePath, FileMode.Create));
    doc.Open();
    try
    {
        //Set the font size for all elements
        StyleSheet styles = new StyleSheet();
        styles.LoadStyle("body", "fontsize", "8px");

        //Write the content to the pdf document
        StringReader sr = new StringReader(html);
        XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, sr);
    }
    catch (Exception ex)
    {
    }
    doc.Close();
}

我错过了什么吗？我开始使用HTMLWorker并已切换到XMLWorker,但我想我现在只是困惑自己.帮助将不胜感激.

ATTEMP#2

谢谢回复!这就是我想出来的,但它没有用.我的内容现在根本没有出现在pdf中,我不知道为什么.有什么想法吗？

using (Document doc = new Document())
{
    PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(fullFilePath, FileMode.Create));
    doc.Open();

    // CSS
    var cssResolver = new StyleAttrCSSResolver();
    var cssFile = XMLWorkerHelper.GetCSS(new FileStream(HttpContext.Current.Server.MapPath("~/css/print.css"), FileMode.Open));
    cssResolver.AddCss(cssFile);

    // HTML
    CssAppliers ca = new CssAppliersImpl();
    HtmlPipelineContext hpc = new HtmlPipelineContext(ca);
    hpc.SetTagFactory(Tags.GetHtmlTagProcessorFactory());

    // PIPELINES
    PdfWriterPipeline pdf = new PdfWriterPipeline(doc, writer);
    HtmlPipeline htmlPipe = new HtmlPipeline(hpc, pdf);
    CssResolverPipeline css = new CssResolverPipeline(cssResolver, htmlPipe);

    XMLWorker worker = new XMLWorker(css, true);
    XMLParser p = new XMLParser(worker);
    StringReader sr = new StringReader(html);
    p.Parse(sr);
    doc.Close();
}

我接近了,还是我完全忽略了这一点？

Answer 1

您可以使用 CSSResolver 创建 XmlWorker

var cssResolver = new StyleAttrCSSResolver();
//Change the path to your CSS file
var cssFile = XMLWorkerHelper.GetCSS(new FileStream(HttpContext.Current.Server.MapPath("~/pdf.css"), FileMode.Open));
cssResolver.AddCss(cssFile);

然后创建 HtmlPipeline 并将其传递给 CssResolverPipeline 构造函数：

CssResolverPipeline css = new CssResolverPipeline(cssResolver, html);
XMLWorker worker = new XMLWorker(css, true);
XMLParser p = new XMLParser(worker); 
using (TextReader sr = new StringReader(html))
        {
            p.Parse(sr);
            document.Close();
        }
        //close your writer
        pdfwriter.Close();