本教程将展示如何在一个现成的PDF文档中添加页眉页脚。在现成的PDF页面中，坐标体系有以下设定：
- 坐标原点是页面的左上角定点
- X轴正半轴向右延伸，Y轴负半轴向下延伸
在页面的空白部分添加图片、文字或横线时，需要自己把握现有文档的边距，防止页眉页脚的内容覆盖到正文。
方法一：直接在现有文档绘制页眉页脚
C#
static void Main(string[] args)
{
//加载一个测试文档
PdfDocument existingPdf = new PdfDocument();
existingPdf.LoadFromFile(@"C:\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);
//保存文档
existingPdf.SaveToFile("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(@"C:\logo.png");
float width = headerImage.Width / 3;
float height = headerImage.Height / 3;
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 = "成都冰蓝科技有限公司\n电话：028-81705109\n网址：http://www.e-iceblue.cn";
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, "第{0}页/共{1}页", 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);
}
}VB.NET
Private Shared Sub Main(args As String())
'加载一个测试文档 Dim existingPdf As New PdfDocument() existingPdf.LoadFromFile("C:\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) '保存文档
existingPdf.SaveToFile("output.pdf")
End Sub
'在页面上方空白部位绘制页眉 Private Shared Sub DrawHeader(doc As PdfDocument) '获取页面大小
Dim pageSize As SizeF = doc.Pages(0).Size
'声明x,y两个float型变量 Dim x As Single = 90 Dim y As Single = 20 For i As Integer = 0 To doc.Pages.Count - 1 '在每一页的指定位置绘制图片
Dim headerImage As PdfImage = PdfImage.FromFile("C:\logo.png")
Dim width As Single = headerImage.Width / 3
Dim height As Single = headerImage.Height / 3
doc.Pages(i).Canvas.DrawImage(headerImage, x, y, width, height)
'在每一页的指定位置绘制横线 Dim pen As New PdfPen(PdfBrushes.Gray,0.5F) doc.Pages(i).Canvas.DrawLine(pen,x,y + height + 2,pageSize.Width - x,y + height + 2) Next End Sub '在页面下方空白部位绘制页脚
Private Shared Sub DrawFooter(doc As PdfDocument)
'获取页面大小 Dim pageSize As SizeF = doc.Pages(0).Size '声明x,y两个float型变量
Dim x As Single = 90
Dim y As Single = pageSize.Height - 72
For i As Integer = 0 To doc.Pages.Count - 1
'在每一页的指定位置绘制横线 Dim pen As 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
Dim font As New PdfTrueTypeFont(New Font("黑体", 10F, FontStyle.Bold), True)
Dim format As New PdfStringFormat(PdfTextAlignment.Left)
Dim footerText As [String] = "成都冰蓝科技有限公司" & vbLf & "电话：028-81705109" & vbLf & "网址：http://www.e-iceblue.cn"
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 Dim number As New PdfPageNumberField() Dim count As New PdfPageCountField() Dim compositeField As New PdfCompositeField(font,PdfBrushes.Black,"第{0}页/共{1}页",number,count) compositeField.StringFormat = New PdfStringFormat(PdfTextAlignment.Right,PdfVerticalAlignment.Top) Dim size As SizeF = font.MeasureString(compositeField.Text) compositeField.Bounds = New RectangleF(pageSize.Width - x - size.Width,y,size.Width,size.Height) compositeField.Draw(doc.Pages(i).Canvas) Next End Sub方法二：通过模板功能添加页眉页脚
C#
static void Main(string[] args){//加载一个测试文档 PdfDocument existingPdf = new PdfDocument();existingPdf.LoadFromFile(@"C:\test.pdf");//创建新的PDF文档 PdfDocument newPdf = new PdfDocument();//设置页面大小 newPdf.PageSettings.Size = existingPdf.Pages[0].Size;//将页边距设置为0 newPdf.PageSettings.Margins = new PdfMargins(0);//创建PdfMargins对象，指定期望设置的页边距 //期望边距需小于或等于现有文档的实际边距，否则页眉页脚可能覆盖主体内容 PdfMargins margins = new PdfMargins(90,72,90,72);//在新建文档的顶部和底部应用页眉页脚模板 newPdf.Template.Top = CreateHeaderTemplate(newPdf,margins);newPdf.Template.Bottom = CreateFooterTemplate(newPdf,margins);//在新建文档的左右部分应用空白模板 newPdf.Template.Left = new PdfPageTemplateElement(margins.Left,newPdf.PageSettings.Size.Height);newPdf.Template.Right = new PdfPageTemplateElement(margins.Right,newPdf.PageSettings.Size.Height);for (int i = 0;i < existingPdf.Pages.Count;i++){//添加页面到新建文档，并将现有文档当做模板绘制到新页面 newPdf.Pages.Add().Canvas.DrawTemplate(existingPdf.Pages[i].CreateTemplate(),new PointF(-margins.Left,-margins.Top));}//保存文档 newPdf.SaveToFile("output.pdf");}//创建页眉模板 static PdfPageTemplateElement CreateHeaderTemplate(PdfDocument doc,PdfMargins margins){//获取页面大小 SizeF pageSize = doc.PageSettings.Size;//创建PdfPageTemplateElement对象headerSpace，即作页眉模板 PdfPageTemplateElement headerSpace = new PdfPageTemplateElement(pageSize.Width,margins.Top);headerSpace.Foreground = false;//声明x,y两个float型变量 float x = margins.Left;float y = 0;//在headerSpace中绘制图片 PdfImage headerImage = PdfImage.FromFile(@"C:\logo.png");float width = headerImage.Width / 3;float height = headerImage.Height / 3;headerSpace.Graphics.DrawImage(headerImage,x,margins.Top - height - 2,width,height);//在headerSpace中绘制横线 PdfPen pen = new PdfPen(PdfBrushes.Gray,0.5f);headerSpace.Graphics.DrawLine(pen,x,y + margins.Top - 2,pageSize.Width - x,y + margins.Top - 2);//返回headerSpace return headerSpace;}//创建页脚模板 static PdfPageTemplateElement CreateFooterTemplate(PdfDocument doc,PdfMargins margins){//获取页面大小 SizeF pageSize = doc.PageSettings.Size;//创建PdfPageTemplateElement对象footerSpace，即页脚模板 PdfPageTemplateElement footerSpace = new PdfPageTemplateElement(pageSize.Width,margins.Bottom);footerSpace.Foreground = false;//声明x,y两个float型变量 float x = margins.Left;float y = 0;//在footerSpace中绘制横线 PdfPen pen = new PdfPen(PdfBrushes.Gray,0.5f);footerSpace.Graphics.DrawLine(pen,x,y,pageSize.Width - x,y);//在footerSpace中绘制文字 y = y + 5;PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("黑体",10f,FontStyle.Bold),true);PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Left);String footerText = "成都冰蓝科技有限公司\n电话：028-81705109\n网址：http://www.e-iceblue.cn";footerSpace.Graphics.DrawString(footerText,font,PdfBrushes.Black,x,y,format);//在footerSpace中绘制当前页码和总页码 PdfPageNumberField number = new PdfPageNumberField();PdfPageCountField count = new PdfPageCountField();PdfCompositeField compositeField = new PdfCompositeField(font,PdfBrushes.Black,"第{0}页/共{1}页",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(footerSpace.Graphics);//返回footerSpace return footerSpace;}VB.NET
Private Shared Sub Main(args As String()) '加载一个测试文档
Dim existingPdf As New PdfDocument()
existingPdf.LoadFromFile("C:\test.pdf")
'创建新的PDF文档 Dim newPdf As New PdfDocument() '设置页面大小
newPdf.PageSettings.Size = existingPdf.Pages(0).Size
'将页边距设置为0 newPdf.PageSettings.Margins = New PdfMargins(0) '创建PdfMargins对象，指定期望设置的页边距
'期望边距需小于或等于现有文档的实际边距，否则页眉页脚可能覆盖主体内容 Dim margins As New PdfMargins(90,72,90,72) '在新建文档的顶部和底部应用页眉页脚模板
newPdf.Template.Top = CreateHeaderTemplate(newPdf, margins)
newPdf.Template.Bottom = CreateFooterTemplate(newPdf, margins)
'在新建文档的左右部分应用空白模板 newPdf.Template.Left = New PdfPageTemplateElement(margins.Left,newPdf.PageSettings.Size.Height) newPdf.Template.Right = New PdfPageTemplateElement(margins.Right,newPdf.PageSettings.Size.Height) For i As Integer = 0 To existingPdf.Pages.Count - 1 '添加页面到新建文档，并将现有文档当做模板绘制到新页面
newPdf.Pages.Add().Canvas.DrawTemplate(existingPdf.Pages(i).CreateTemplate(), New PointF(-margins.Left, -margins.Top))
Next
'保存文档 newPdf.SaveToFile("output.pdf") End Sub '创建页眉模板
Private Shared Function CreateHeaderTemplate(doc As PdfDocument, margins As PdfMargins) As PdfPageTemplateElement
'获取页面大小 Dim pageSize As SizeF = doc.PageSettings.Size '创建PdfPageTemplateElement对象headerSpace，即作页眉模板
Dim headerSpace As New PdfPageTemplateElement(pageSize.Width, margins.Top)
headerSpace.Foreground = False
'声明x,y两个float型变量 Dim x As Single = margins.Left Dim y As Single = 0 '在headerSpace中绘制图片
Dim headerImage As PdfImage = PdfImage.FromFile("C:\logo.png")
Dim width As Single = headerImage.Width / 3
Dim height As Single = headerImage.Height / 3
headerSpace.Graphics.DrawImage(headerImage, x, margins.Top - height - 2, width, height)
'在headerSpace中绘制横线 Dim pen As New PdfPen(PdfBrushes.Gray,0.5F) headerSpace.Graphics.DrawLine(pen,x,y + margins.Top - 2,pageSize.Width - x,y + margins.Top - 2) '返回headerSpace
Return headerSpace
End Function
'创建页脚模板 Private Shared Function CreateFooterTemplate(doc As PdfDocument,margins As PdfMargins) As PdfPageTemplateElement '获取页面大小
Dim pageSize As SizeF = doc.PageSettings.Size
'创建PdfPageTemplateElement对象footerSpace，即页脚模板 Dim footerSpace As New PdfPageTemplateElement(pageSize.Width,margins.Bottom) footerSpace.Foreground = False '声明x,y两个float型变量
Dim x As Single = margins.Left
Dim y As Single = 0
'在footerSpace中绘制横线 Dim pen As New PdfPen(PdfBrushes.Gray,0.5F) footerSpace.Graphics.DrawLine(pen,x,y,pageSize.Width - x,y) '在footerSpace中绘制文字
y = y + 5
Dim font As New PdfTrueTypeFont(New Font("黑体", 10F, FontStyle.Bold), True)
Dim format As New PdfStringFormat(PdfTextAlignment.Left)
Dim footerText As [String] = "成都冰蓝科技有限公司" & vbLf & "电话：028-81705109" & vbLf & "网址：http://www.e-iceblue.cn"
footerSpace.Graphics.DrawString(footerText, font, PdfBrushes.Black, x, y, format)
'在footerSpace中绘制当前页码和总页码 Dim number As New PdfPageNumberField() Dim count As New PdfPageCountField() Dim compositeField As New PdfCompositeField(font,PdfBrushes.Black,"第{0}页/共{1}页",number,count) compositeField.StringFormat = New PdfStringFormat(PdfTextAlignment.Right,PdfVerticalAlignment.Top) Dim size As SizeF = font.MeasureString(compositeField.Text) compositeField.Bounds = New RectangleF(pageSize.Width - x - size.Width,y,size.Width,size.Height) compositeField.Draw(footerSpace.Graphics) '返回footerSpace
Return footerSpace
End Function效果图:
