.net core利用PdfSharpCore操作PDF实例教程
目录
- 前序
 - 1.设置PDF拥有者的密码,让PDF防篡改。
 - 2.PDF添加页眉和页脚
 - (2)添加页眉
 - (3)添加页脚
 - 3.PDF添加水印文字
 - 4.PDF 添加图片
 - 总结
 
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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