C# 添加PDF页眉/页脚的示例代码

2020-01-24 00:15:41

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概述

页眉页脚是一篇完整、精致的文档的重要组成部分。在页眉页脚处，可以呈现的内容很多，如公司名称、页码、工作表名、日期、图片，如LOGO、标记等。在下面的文章中，将介绍如何在PDF中添加页眉页脚。通过代码测试，添加页眉页脚可以分两种情况来实现效果：

1.通过添加新的一页，在新建的页面上来添加页眉页脚

2.通过给现有文档直接添加页眉页脚

下面将根据这两种情况介绍具体的C#代码操作

使用工具

Free Spire.PDF for .NET 4.3（社区版）

示例代码（供参考）

1.新建一页来添加页眉页脚

1.1 添加页眉

【C#】

using Spire.Pdf;using Spire.Pdf.Graphics;using System.Drawing;using System;namespace AddHeader_PDF{  class Program  {    static void Main(string[] args)    {      //新建一个PdfDocument类对象，并添加一页      PdfDocument pdf = new PdfDocument();      PdfPageBase page = pdf.Pages.Add();      //设置margin      PdfUnitConvertor unitCvtr = new PdfUnitConvertor();      PdfMargins margin = new PdfMargins();      margin.Top = unitCvtr.ConvertUnits(2.54f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point);      margin.Bottom = margin.Top;      margin.Left = unitCvtr.ConvertUnits(4.17f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point);      margin.Right = margin.Left;      //调用AddHeader()方法添加页眉      AddHeader(pdf, PdfPageSize.A4, margin);      //保存并打开文档      pdf.SaveToFile("PDF页眉.pdf");      System.Diagnostics.Process.Start("PDF页眉.pdf");    }    static void AddHeader(PdfDocument doc, SizeF pageSize, PdfMargins margin)    {      //初始化一个PdfPageTemplateElement对象，用于创建页眉      PdfPageTemplateElement headerSpace = new PdfPageTemplateElement(pageSize.Width, margin.Top);      headerSpace.Foreground = true;      doc.Template.Top = headerSpace;      //在页眉部分绘入文字      PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS", 10f), true);      PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Right);      String headerText = "WORLD TRADE ORGANIZATION, WTO /n THE INTERNATIONAL ORGANIZATION THAT REGULATES INTERNATIONAL TRADE";      float x = PdfPageSize.A4.Width;      float y = 0;      headerSpace.Graphics.DrawString(headerText, font, PdfBrushes.Black, x, y, format);      //在页眉部分绘入图片      PdfImage headerImage = PdfImage.FromFile(@"C:/Users/Administrator/Desktop/1.png");      float width = headerImage.Width / 2;      float height = headerImage.Height / 3;      headerSpace.Graphics.DrawImage(headerImage, 0, 0, width, height);    }  }}

页眉添加效果：

1.2添加页脚

【C#】

using Spire.Pdf;using Spire.Pdf.Graphics;using System.Drawing;using System;using Spire.Pdf.AutomaticFields;namespace AddFooter_PDF{  class Program  {    static void Main(string[] args)    {      //新建一个PdfDocument类对象，添加一页      PdfDocument doc = new PdfDocument();      PdfPageBase page = doc.Pages.Add();      //设置margin      PdfUnitConvertor unitCvtr = new PdfUnitConvertor();      PdfMargins margin = new PdfMargins();      margin.Top = unitCvtr.ConvertUnits(2.54f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point);      margin.Bottom = margin.Top;      margin.Left = unitCvtr.ConvertUnits(4.17f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point);      margin.Right = margin.Left;      //调用AddFooter()方法添加页脚      AddFooter(doc, PdfPageSize.A4, margin);      //调用AddPageNumber()方法添加页码      AddPageNumber(doc, margin);      //保存并打开文档      doc.SaveToFile("PDF页脚.pdf");      System.Diagnostics.Process.Start("PDF页脚.pdf");    }    static void AddFooter(PdfDocument doc, SizeF pageSize, PdfMargins margin)    {      //初始化一个PdfPageTemplateElement对象，用于创建页脚      PdfPageTemplateElement footerSpace = new PdfPageTemplateElement(pageSize.Width, margin.Bottom);      footerSpace.Foreground = true;      doc.Template.Bottom = footerSpace;      //在页脚部分绘入文字      PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS", 10f), true);      PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Center);      String headerText = "Website : www.wto.org";      float x = PdfPageSize.A4.Width / 2;      float y = 0;      footerSpace.Graphics.DrawString(headerText, font, PdfBrushes.Black, x, y, format);    }    static void AddPageNumber(PdfDocument doc, PdfMargins margin)    {      //添加页码到页脚部分      foreach (PdfPageBase page in doc.Pages)      {        PdfStringFormat format1 = new PdfStringFormat(PdfTextAlignment.Left);        int x1 = Convert.ToInt32(page.Canvas.ClientSize.Width / 2);        int y1 = Convert.ToInt32(page.Canvas.ClientSize.Height - margin.Bottom + 20);        Rectangle bounds = new Rectangle(x1, y1, 20, 20);        PdfPageNumberField field = new PdfPageNumberField();        PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS", 10f), true);        field.Font = font;        field.StringFormat = format1;        field.Brush = PdfBrushes.Black;        field.Bounds = bounds;        field.Draw(page.Canvas);      }    }  }}

页脚添加效果：

2.给现有PDF文档添加页眉页脚

【C#】

using Spire.Pdf;using Spire.Pdf.AutomaticFields;using Spire.Pdf.Graphics;using System;using System.Drawing;namespace PdfHeader{  class Program  {    static void Main(string[] args)    {      //加载一个测试文档      PdfDocument existingPdf = new PdfDocument();      existingPdf.LoadFromFile("Test.pdf");      //调用DrawHeader方法在现有文档添加页眉      DrawHeader(existingPdf);      //调用DrawFooter方法在现有文档添加页脚      DrawFooter(existingPdf);      //保存并打开文档      existingPdf.SaveToFile("output.pdf");      System.Diagnostics.Process.Start("output.pdf");    }    //在页面上方空白部位绘制页眉    static void DrawHeader(PdfDocument doc)    {      //获取页面大小      SizeF pageSize = doc.Pages[0].Size;      //声明x,y两个float类型变量      float x = 90;      float y = 20;      for (int i = 0; i < doc.Pages.Count; i++)      {        //在每一页的指定位置绘制图片        PdfImage headerImage = PdfImage.FromFile("logo.png");        float width = headerImage.Width / 7;        float height = headerImage.Height / 7;        doc.Pages[i].Canvas.DrawImage(headerImage, x, y, width, height);        //在每一页的指定位置绘制横线        PdfPen pen = new PdfPen(PdfBrushes.Gray, 0.5f);        doc.Pages[i].Canvas.DrawLine(pen, x, y + height + 2, pageSize.Width - x, y + height + 2);      }    }    //在页面下方空白部位绘制页脚    static void DrawFooter(PdfDocument doc)    {      //获取页面大小      SizeF pageSize = doc.Pages[0].Size;      //声明x,y两个float类型变量      float x = 90;      float y = pageSize.Height - 72;      for (int i = 0; i < doc.Pages.Count; i++)      {        //在每一页的指定位置绘制横线        PdfPen pen = new PdfPen(PdfBrushes.Gray, 0.5f);        doc.Pages[i].Canvas.DrawLine(pen, x, y, pageSize.Width - x, y);        //在每一页的指定位置绘制文字        y = y + 5;        PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("黑体", 10f, FontStyle.Bold), true);        PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Left);        String footerText = " Website/n https://g20.org/";        doc.Pages[i].Canvas.DrawString(footerText, font, PdfBrushes.Black, x, y, format);                 //在每一页的指定位置当前页码和总页码        PdfPageNumberField number = new PdfPageNumberField();        PdfPageCountField count = new PdfPageCountField();        PdfCompositeField compositeField = new PdfCompositeField(font, PdfBrushes.Black, "{0}/{1}", number, count);        compositeField.StringFormat = new PdfStringFormat(PdfTextAlignment.Right, PdfVerticalAlignment.Top);        SizeF size = font.MeasureString(compositeField.Text);        compositeField.Bounds = new RectangleF(pageSize.Width - x - size.Width, y, size.Width, size.Height);        compositeField.Draw(doc.Pages[i].Canvas);      }    }  }}

测试效果：