目录

前序

使用PdfSharpCore请注意使用XGraphics基类,与System.Drawing 的Graphics类似,XGraphics 提供XColor(颜色)、XPen(画笔)、XBrush(画刷)、XFont(字体)、XPoint(位置)等对象。提供很多画线,矩形,圆,扇形,多边形,图,文本等方法。源码请查看https://github.com/ststeiger/PdfSharpCore/blob/master/PdfSharpCore/Drawing/XGraphics.cs

1.设置PDF拥有者的密码,让PDF防篡改。

代码很简单设置PdfDocument.SecuritySettings.OwnerPassword

            PdfDocument doc = PdfReader.Open(@"a.pdf", PdfDocumentOpenMode.Modify);            doc.SecuritySettings.OwnerPassword = "123";            var filePath = $"b.pdf";            doc.Save(filePath);

2.PDF添加页眉和页脚

(1)添加页码显示

XStringFormats 指定文本的位置:详请查看https://github.com/ststeiger/PdfSharpCore/blob/master/PdfSharpCore/Drawing/XStringFormats.cs

XFont font = new XFont("SimHei", 8);            XBrush brush = XBrushes.Black;            PdfDocument doc = PdfReader.Open(@"a.pdf", PdfDocumentOpenMode.Modify);            for (int i = 0; i < doc.Pages.Count; i++)            {                PdfPage page = doc.Pages[i];                XRect layoutRectangle = new XRect(0, page.Height - font.Height, page.Width, font.Height);                using (XGraphics gfx = XGraphics.FromPdfPage(page))                {                    gfx.DrawString(                        $"第{(i + 1).ToString()}页/共{doc.Pages.Count}页",                        font,                        brush,                        layoutRectangle,                        XStringFormats.BottomLeft);                }            }

(2)添加页眉

XFont font = new XFont("SimHei", 8);            XBrush brush = new XSolidBrush(XColor.FromArgb(128, 255, 0, 0));            XPoint point = new XPoint(90, 20);            PdfDocument doc = PdfReader.Open(@"a.pdf", PdfDocumentOpenMode.Modify);            for (int i = 0; i < doc.Pages.Count; i++)            {                var renderer = XGraphics.FromPdfPage(doc.Pages[i]);                XSize pageSize = renderer.PageSize;                renderer.DrawString("xxx有限公司", font, brush, point);                XPen pen = new XPen(XBrushes.Gray, 0.5f);                renderer.DrawLine(pen, point.X, point.Y, pageSize.Width - point.X, point.Y);            }            doc.Save("b.pdf");

(3)添加页脚

XFont font = new XFont("SimHei", 8);            XBrush brush = new XSolidBrush(XColor.FromArgb(128, 255, 0, 0));            PdfDocument doc = PdfReader.Open(@"a.pdf", PdfDocumentOpenMode.Modify);            for (int i = 0; i < doc.Pages.Count; i++)            {                var renderer = XGraphics.FromPdfPage(doc.Pages[i]);                XSize pageSize = renderer.PageSize;                XPoint point = new XPoint(90, pageSize.Height-20);                renderer.DrawString("xxx有限公司", font, brush, point);                XPen pen = new XPen(XBrushes.Gray, 0.5f);                renderer.DrawLine(pen, point.X, point.Y-10, pageSize.Width - point.X, point.Y-10);            }            doc.Save("b.pdf");

3.PDF添加水印文字

XFont font = new XFont("SimHei", 8);            XBrush brush =new XSolidBrush(XColor.FromArgb(128, 255, 0, 0));            PdfDocument doc = PdfReader.Open(@"a.pdf", PdfDocumentOpenMode.Modify);            for (int i = 0; i < doc.Pages.Count; i++)            {                XStringFormat stringFormat = new XStringFormat();                stringFormat.Alignment = XStringAlignment.Center;                stringFormat.LineAlignment = XLineAlignment.Center;                PdfPage page = doc.Pages[i];                var gfx = XGraphics.FromPdfPage(page, XPageDirection.Downwards);                gfx.DrawString(                       $"xxx公司版权所有",                       font,                       brush,                       new XPoint(500, 500),                        stringFormat);            }            doc.Save("b.pdf");

4.PDF 添加图片

//第一步先加载PDF文件            PdfDocument doc = PdfReader.Open(@"a.pdf", PdfDocumentOpenMode.Modify);            //导入图片(地址,文件流)            var background = XImage.FromFile(@"QRCode.png");            // var background = XImage.FromStream(()=> stream);            //指定PDF 的页            PdfPage page = doc.Pages[0];            var gfx = XGraphics.FromPdfPage(page, XPageDirection.Downwards);            //写入指定位置            gfx.DrawImage(background, 20, 20, 250, 140);            doc.Save("b.pdf");

 docker 模式,需要在 dockerfile 中添加如下配置

RUN apt-get update && apt-get -y install libfontconfig1

如需要指定字体,请将字段文件进行拷贝(比如雅黑)

COPY /xx/xxx/SIMHEI.TTF /usr/share/fonts/SIMHEI.TTF

总结

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