HTML到PDF转换问题

Question

将HTML（MVC Razor页面）转换为非UTF8字符的PDF时遇到两个问题。

1）生成带有中文字符的PDF 2）每当我启用添加CSS文件时，我总是会遇到异常“输入字符串格式不正确”。但是当我评论我自己的CSS并使用GetDefaultCSS时，错误没有出现并且正在生成PDF但是中文字符显示为问号（？）

以下是代码：

public static byte[] BuildPDFContent<T>(T model, string template, ControllerContext context)
{
    CoreController controller = (CoreController)context.Controller;
    var html = controller.RenderRazorViewToString(template, model);
    MemoryStream msInput = new MemoryStream(ASCIIEncoding.Default.GetBytes(html));
    MemoryStream msOutput = new MemoryStream();

    string fontAwesomeCss = HttpContext.Current.Server.MapPath("/Content/css/font-awesome.min.css");
    string bootstrapCss = HttpContext.Current.Server.MapPath("/Content/css/bootstrap.css");
    string siteCss = HttpContext.Current.Server.MapPath("/Content/css/site.css");
    Document doc = new Document(iTextSharp.text.PageSize.A4);
    doc.SetMargins(doc.LeftMargin, doc.RightMargin, 35, 0);
    PdfWriter pdfWriter = PdfWriter.GetInstance(doc, msOutput);
    doc.Open();
    var tagProcessors = (DefaultTagProcessorFactory)Tags.GetHtmlTagProcessorFactory();
    tagProcessors.RemoveProcessor(HTML.Tag.IMG); // remove the default processor
    tagProcessors.AddProcessor(HTML.Tag.IMG, new CustomImageTagProcessor()); // use our new processor
    CssFilesImpl cssFiles = new CssFilesImpl();
    cssFiles.Add(XMLWorkerHelper.GetCSS(new FileStream(fontAwesomeCss, FileMode.Open)));
    cssFiles.Add(XMLWorkerHelper.GetCSS(new FileStream(bootstrapCss, FileMode.Open)));
    cssFiles.Add(XMLWorkerHelper.GetCSS(new FileStream(siteCss, FileMode.Open)));
    //cssFiles.Add(XMLWorkerHelper.GetInstance().GetDefaultCSS());
    StyleAttrCSSResolver cssResolver = new StyleAttrCSSResolver(cssFiles);
    var hpc = new HtmlPipelineContext(new CssAppliersImpl(new UnicodeFontFactory()));
    hpc.SetAcceptUnknown(true).AutoBookmark(true).SetTagFactory(tagProcessors); // inject the tagProcessors
    HtmlPipeline htmlPipeline = new HtmlPipeline(hpc, new PdfWriterPipeline(doc, pdfWriter));
    IPipeline pipeline = new CssResolverPipeline(cssResolver, htmlPipeline);
    XMLWorker worker = new XMLWorker(pipeline, true);
    XMLParser xmlParse = new XMLParser(true, worker);
    xmlParse.Parse(msInput);
    doc.Close();
    return msOutput.ToArray();

}

private class UnicodeFontFactory : FontFactoryImp
{
    private static readonly string FontPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Fonts),
      "arialuni.ttf");

    private readonly BaseFont _baseFont;

    public UnicodeFontFactory()
    {
        _baseFont = BaseFont.CreateFont(FontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

    }

    public override Font GetFont(string fontname, string encoding, bool embedded, float size, int style, BaseColor color,
      bool cached)
    {
        return new Font(_baseFont, size, style, color);
    }
}