css - 制作 pdf 时无法让 CSS 在 iTextSharp (5.4.3) 中工作

Question

我在尝试使用 iTextSharp (5.4.3) 生成库将 css 文件应用到我的 pdf 时遇到问题。基本上根本没有应用 css。

我的vb.net文件中有以下方法

    Protected Sub btnPreview_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnPreview.Click
    Dim bytes As Byte()
    bytes = System.Text.Encoding.UTF8.GetBytes(letterRadEdit.Content)

    Dim tagProcessor As tool.xml.html.DefaultTagProcessorFactory()

    Using input As New MemoryStream(bytes, False)

        Dim ms As New MemoryStream()

        Dim document As New iTextSharp.text.Document(iTextSharp.text.PageSize.LETTER, 36, 36, 36, 36)
        Dim writer As PdfWriter = PdfWriter.GetInstance(document, ms)

        writer.CloseStream = False
        document.Open()

        Dim htmlContext As HtmlPipelineContext = New HtmlPipelineContext(Nothing)
        htmlContext.SetAcceptUnknown(True)
        htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory())
        Dim cssResolver As ICSSResolver = XMLWorkerHelper.GetInstance().GetDefaultCssResolver(False)
        cssResolver.AddCssFile(HttpContext.Current.Server.MapPath("/assets/css/pdf.css"), True)

        Dim pipeline As New CssResolverPipeline(cssResolver, New HtmlPipeline(htmlContext, New PdfWriterPipeline(document, writer)))
        Dim pdfworker As New XMLWorker(pipeline, True)
        Dim p As New XMLParser(True, pdfworker, New System.Text.UTF8Encoding)

        Try

            'p.AddListener(pdfworker)
            'p.Parse(input, Encoding.UTF8)

            XMLWorkerHelper.GetInstance().ParseXHtml(writer, document, input, New FileStream(HttpContext.Current.Server.MapPath("~/assets/css/pdf.css"), FileMode.Open, FileAccess.Read))
        Catch

        Finally
            pdfworker.Close()

        End Try

        document.Close()
        ms.Position = 0

        Response.Buffer = True
        Response.Clear()
        Response.ContentType = "application/pdf"
        Response.AddHeader("content-disposition", "attachment; filename=preview.pdf")
        Response.BinaryWrite(ms.GetBuffer())
        Response.Flush()
    End Using
End Sub

CSS 文件仅包含:

p{color:#e10000;margin-bottom:1.2em;}

(这是为了测试它是否正确呈现，所有文本应该是红色的)

我的问题是下面的命令

XMLWorkerHelper.GetInstance().ParseXHtml(writer, document, input, New FileStream(HttpContext.Current.Server.MapPath("~/assets/css/pdf.css"), FileMode.Open, FileAccess.Read))

正确生成 pdf，但未对其应用 CSS。我知道它正在读取 CSS，因为在我应用 FileAccess.Read 属性之前我遇到了权限异常

方法

p.Parse(input, Encoding.UTF8)

不生成任何 pdf，只是一个“元素不允许”异常，这是因为 html(来自 radeditor 文本框，2013 年第 3 季度)是旧 html，并且解析似乎对表格有问题。

Answer 1

iTextSharp 对于使用 css、图像等的设计非常糟糕。取而代之的是 wkhtmltopdf是最好的。