.net core-利用PdfSharpCore 操作PDF实例
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
![复制代码](https://common.cnblogs.com/images/copycode.gif)
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); } }
![复制代码](https://common.cnblogs.com/images/copycode.gif)
(2)添加页眉
![复制代码](https://common.cnblogs.com/images/copycode.gif)
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");
![复制代码](https://common.cnblogs.com/images/copycode.gif)
(3)添加页脚
![复制代码](https://common.cnblogs.com/images/copycode.gif)
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");
![复制代码](https://common.cnblogs.com/images/copycode.gif)
3.PDF添加水印文字
![复制代码](https://common.cnblogs.com/images/copycode.gif)
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");
![复制代码](https://common.cnblogs.com/images/copycode.gif)
4.PDF 添加图片
![复制代码](https://common.cnblogs.com/images/copycode.gif)
//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");
![复制代码](https://common.cnblogs.com/images/copycode.gif)