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我需要将参数传递给 htmlToPdfConverter_PageLayoutingEvent；我尝试简单地将 htmlToPdfConverter_PageLayoutingEvent(PdfPageLayoutingParams eventParams) 扩展到 htmlToPdfConverter_PageLayoutingEvent(PdfPageLayoutingParams eventParams, string title, boolean enabled) 但我无法正确传递 PdfPageLayoutingParams；完整代码如下

protected void buttonCreatePdf_Click(object sender, EventArgs e)
{
    // create the HTML to PDF converter
    HtmlToPdf htmlToPdfConverter = new HtmlToPdf();

    // attach to PageLayoutingEvent event raised right before layouting the HTML content in a PDF page
    htmlToPdfConverter.PageLayoutingEvent += new PdfPageLayoutingDelegate(htmlToPdfConverter_PageLayoutingEvent);

    // set PDF page margins
    htmlToPdfConverter.Document.Margins = new PdfMargins(
                                int.Parse(textBoxLeftMargin.Text), int.Parse(textBoxRightMargin.Text),
                                int.Parse(textBoxTopMargin.Text), int.Parse(textBoxBottomMargin.Text));
            
    try
    {
        byte[] pdfBuffer = htmlToPdfConverter.ConvertUrlToMemory(textBoxUrl.Text);

        // inform the browser about the binary data format
        HttpContext.Current.Response.AddHeader("Content-Type", "application/pdf");

        // let the browser know how to open the PDF document, attachment or inline, and the file name
        HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("attachment; filename=SetPdfBackground.pdf; size={0}",
                        pdfBuffer.Length.ToString()));

        // write the PDF buffer to HTTP response
        HttpContext.Current.Response.BinaryWrite(pdfBuffer);

        // call End() method of HTTP response to stop ASP.NET page processing
        HttpContext.Current.Response.End();
    }
    finally
    {
        // dettach from PageLayoutingEvent event
        htmlToPdfConverter.PageLayoutingEvent -= new PdfPageLayoutingDelegate(htmlToPdfConverter_PageLayoutingEvent);
    }
}

/// <summary>
/// The PageLayoutingEvent event handler called before each PDF page is rendered by the converter
/// </summary>
/// <param name="eventParams">The event handler parameter giving information about the PDF page being rendered 
/// and the rectangle in page that will be rendered</param>
void htmlToPdfConverter_PageLayoutingEvent(PdfPageLayoutingParams eventParams)
{
    // The PDF page being rendered
    PdfPage crtPage = eventParams.PdfPage;

    // draw a colored rectangle in the background of the PDF page
    PdfRectangle backColorRect = new PdfRectangle(0, 0, crtPage.DrawableRectangle.Width, crtPage.DrawableRectangle.Height);
    backColorRect.BackColor = System.Drawing.Color.FromArgb(255, int.Parse(textBoxR.Text), int.Parse(textBoxG.Text), int.Parse(textBoxB.Text));
    crtPage.Layout(backColorRect);

    // draw a 2 points orange line under the rendered content in page
    System.Drawing.PointF leftBottom = new System.Drawing.PointF(eventParams.LayoutingBounds.Left, eventParams.LayoutingBounds.Bottom + 1);
    System.Drawing.PointF rightBottom = new System.Drawing.PointF(eventParams.LayoutingBounds.Right, eventParams.LayoutingBounds.Bottom + 1);
    PdfLine bottomLine = new PdfLine(leftBottom, rightBottom);
    bottomLine.LineStyle.LineWidth = 2.0f;
    bottomLine.ForeColor = System.Drawing.Color.OrangeRed;
    crtPage.Layout(bottomLine);
}

所以总结一下：我需要将“字符串标题，启用布尔值”参数传递给 htmlToPdfConverter_PageLayoutingEvent，因为我需要这些参数来决定预布局要求。

先感谢您。

示例来自 HiQpdf 示例：https ://www.hiqpdf.com/demo/SetPdfBackgroundLayer.aspx

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