.net core利用PdfSharpCore操作PDF实例教程

作者：袖梨 2026-09-16

操作pdf是我们日常开发中经常遇到的功能,下面这篇文章主要给大家介绍了关于.net core利用PdfSharpCore操作PDF实例的相关资料,文中通过示例代码介绍的非常详细,需要的朋友可以参考下

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://gi**t*hub.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://githu**b.*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