页眉页脚是一篇完整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：
通过创建新的PDF文档，在新建的页面上来添加页眉页脚
通过加载PDF文档，并添加页眉页脚
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（社区版）
1.新建文档，添加页眉页脚
1.1 添加页眉
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
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.加载PDF文档，添加页眉页脚
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：
附：PDF页眉页脚添加方法的视频教程详情，可查看：C# PDF添加页眉页脚
(本文完）