C#处理PDF 第三节(添加PDF页眉/页脚)

测试效果：

2.给现有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);
  }
}




}
}