c# - 如何在 C# 中使用 iTextSharp 将添加的图像带到最前沿

Question

好的，我必须制作一个具有某些样式的 PDF。是为了标签。我有以下代码:

Document doc = new Document(PageSize.A4);

    int labelHeight = 394;
    int labelWidth = 556;

    float labelTop = doc.PageSize.Height - 2;
    float labelBottom = doc.PageSize.Height - labelHeight;

    MemoryStream ms = new MemoryStream();
    PdfWriter writer = PdfWriter.GetInstance(doc, ms);
    doc.Open();

    PdfContentByte cb = writer.DirectContent;

    // Generate Boxes For Content

    cb.SetColorStroke(new CMYKColor(207, 115, 255, 133));
    cb.SetLineWidth(4);
    cb.SetColorFill(new CMYKColor(207, 71, 255, 38));

    cb.MoveTo(2, labelBottom);
    cb.LineTo(labelWidth - 2, labelBottom);
    cb.LineTo(labelWidth - 2, labelTop);
    cb.LineTo(2, labelTop);

    cb.ClosePathFillStroke(); // Draw Main Green Box

    cb.SetColorStroke(new CMYKColor(0, 0, 0, 0));
    cb.SetLineWidth(1);
    cb.SetColorFill(new CMYKColor(0, 0, 0, 0));

    int whiteBoxTop = 100;
    int whiteBoxHeight = 260;

    cb.MoveTo(5, labelTop - (whiteBoxTop + whiteBoxHeight));
    cb.LineTo(labelWidth - 5, labelTop - (whiteBoxTop + whiteBoxHeight));
    cb.LineTo(labelWidth - 5, labelTop - whiteBoxTop);
    cb.LineTo(5, labelTop - whiteBoxTop);

    cb.ClosePathFillStroke(); // Draw Inner White Content Box

    cb.SetColorStroke(new CMYKColor(20, 15, 41, 0));
    cb.SetLineWidth(0);
    cb.SetColorFill(new CMYKColor(20, 15, 41, 0));

    cb.MoveTo(labelWidth / 2, labelTop - ((whiteBoxTop + whiteBoxHeight) - 4));
    cb.LineTo(labelWidth - 9, labelTop - ((whiteBoxTop + whiteBoxHeight) - 4));
    cb.LineTo(labelWidth - 9, labelTop - (whiteBoxTop + 4));
    cb.LineTo(labelWidth / 2, labelTop - (whiteBoxTop + 4));

    cb.ClosePathFillStroke();

    string logoPath = Server.MapPath(".") + "/pdf_logo.jpg";

    iTextSharp.text.Image logo = iTextSharp.text.Image.GetInstance(logoPath);

    logo.SetAbsolutePosition(labelWidth / 4, labelTop - (whiteBoxTop + whiteBoxHeight) + 25);
    logo.ScaleToFit(150, 30);


    doc.Add(logo);    

    doc.Close();

问题在于添加的 Logo 。如果我添加它并将它显示在我正在创建的框下方，它就会显示出来，但是当我将绝对位置放在框所在的位置时，它会消失在绘制的框后面。我需要做什么才能将图像放在我绘制的框上方？对于我尝试添加到框顶部的任何文本，也会发生同样的问题。

Answer 1

尝试将 Logo 添加到您的 PdfContentByte 对象而不是您的 Document。

替换这个:

doc.Add(logo);

用这个:

cb.AddImage(logo);