Ajouter L'en-tête et le pied de page pour PDF en utilisant iTextsharp

consultez l'exemple de code ci-dessous:

private void CreatePDF()
{
    string fileName = string.Empty;    
    DateTime fileCreationDatetime = DateTime.Now;    
    fileName = string.Format("{0}.pdf", fileCreationDatetime.ToString(@"yyyyMMdd") + "_" + fileCreationDatetime.ToString(@"HHmmss"));    
    string pdfPath = Server.MapPath(@"~\PDFs\") +   fileName;

    using (FileStream msReport = new FileStream(pdfPath, FileMode.Create))
    {
        //step 1
        using (Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 140f, 10f))
        {
            try
            {
                // step 2
                PdfWriter pdfWriter = PdfWriter.GetInstance(pdfDoc, msReport);
                pdfWriter.PageEvent = new Common.ITextEvents();

                //open the stream 
                pdfDoc.Open();

                for (int i = 0; i < 10; i++)
                {
                    Paragraph para = new Paragraph("Hello world. Checking Header Footer", new Font(Font.FontFamily.HELVETICA, 22));    
                    para.Alignment = Element.ALIGN_CENTER;    
                    pdfDoc.Add(para);    
                    pdfDoc.NewPage();
                }

                pdfDoc.Close();    
            }
            catch (Exception ex)
            {
                //handle exception
            }    
            finally
            { 
            }    
        }    
    }
}

et créer un fichier de classe nommé ITextEvents.cs et ajouter le code suivant:

public class ITextEvents : PdfPageEventHelper
{    
    // This is the contentbyte object of the writer
    PdfContentByte cb;

    // we will put the final number of pages in a template
    PdfTemplate headerTemplate, footerTemplate;

    // this is the BaseFont we are going to use for the header / footer
    BaseFont bf = null;

    // This keeps track of the creation time
    DateTime PrintTime = DateTime.Now;    

    #region Fields
    private string _header;
    #endregion

    #region Properties
    public string Header
    {
        get { return _header; }
        set { _header = value; }
    }
    #endregion    

    public override void OnOpenDocument(PdfWriter writer, Document document)
    {
        try
        {
            PrintTime = DateTime.Now;
            bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
            cb = writer.DirectContent;
            headerTemplate = cb.CreateTemplate(100, 100);
            footerTemplate = cb.CreateTemplate(50, 50);
        }
        catch (DocumentException de)
        {    
        }
        catch (System.IO.IOException ioe)
        {    
        }
    }

    public override void OnEndPage(iTextSharp.text.pdf.PdfWriter writer, iTextSharp.text.Document document)
    {
        base.OnEndPage(writer, document);    
        iTextSharp.text.Font baseFontNormal = new iTextSharp.text.Font(iTextSharp.text.Font.FontFamily.HELVETICA, 12f, iTextSharp.text.Font.NORMAL, iTextSharp.text.BaseColor.BLACK);    
        iTextSharp.text.Font baseFontBig = new iTextSharp.text.Font(iTextSharp.text.Font.FontFamily.HELVETICA, 12f, iTextSharp.text.Font.BOLD, iTextSharp.text.BaseColor.BLACK);    
        Phrase p1Header = new Phrase("Sample Header Here", baseFontNormal);

        //Create PdfTable object
        PdfPTable pdfTab = new PdfPTable(3);

        //We will have to create separate cells to include image logo and 2 separate strings
        //Row 1
        PdfPCell pdfCell1 = new PdfPCell();
        PdfPCell pdfCell2 = new PdfPCell(p1Header);
        PdfPCell pdfCell3 = new PdfPCell();
        String text = "Page " + writer.PageNumber + " of ";    

        //Add paging to header
        {
            cb.BeginText();
            cb.SetFontAndSize(bf, 12);
            cb.SetTextMatrix(document.PageSize.GetRight(200), document.PageSize.GetTop(45));
            cb.ShowText(text);
            cb.EndText();
            float len = bf.GetWidthPoint(text, 12);
            //Adds "12" in Page 1 of 12
            cb.AddTemplate(headerTemplate, document.PageSize.GetRight(200) + len, document.PageSize.GetTop(45));
        }
        //Add paging to footer
        {
            cb.BeginText();
            cb.SetFontAndSize(bf, 12);
            cb.SetTextMatrix(document.PageSize.GetRight(180), document.PageSize.GetBottom(30));
            cb.ShowText(text);
            cb.EndText();
            float len = bf.GetWidthPoint(text, 12);
            cb.AddTemplate(footerTemplate, document.PageSize.GetRight(180) + len, document.PageSize.GetBottom(30));
        }

        //Row 2
        PdfPCell pdfCell4 = new PdfPCell(new Phrase("Sub Header Description", baseFontNormal));

        //Row 3 
        PdfPCell pdfCell5 = new PdfPCell(new Phrase("Date:" + PrintTime.ToShortDateString(), baseFontBig));
        PdfPCell pdfCell6 = new PdfPCell();
        PdfPCell pdfCell7 = new PdfPCell(new Phrase("TIME:" + string.Format("{0:t}", DateTime.Now), baseFontBig));    

        //set the alignment of all three cells and set border to 0
        pdfCell1.HorizontalAlignment = Element.ALIGN_CENTER;
        pdfCell2.HorizontalAlignment = Element.ALIGN_CENTER;
        pdfCell3.HorizontalAlignment = Element.ALIGN_CENTER;
        pdfCell4.HorizontalAlignment = Element.ALIGN_CENTER;
        pdfCell5.HorizontalAlignment = Element.ALIGN_CENTER;
        pdfCell6.HorizontalAlignment = Element.ALIGN_CENTER;
        pdfCell7.HorizontalAlignment = Element.ALIGN_CENTER;    

        pdfCell2.VerticalAlignment = Element.ALIGN_BOTTOM;
        pdfCell3.VerticalAlignment = Element.ALIGN_MIDDLE;
        pdfCell4.VerticalAlignment = Element.ALIGN_TOP;
        pdfCell5.VerticalAlignment = Element.ALIGN_MIDDLE;
        pdfCell6.VerticalAlignment = Element.ALIGN_MIDDLE;
        pdfCell7.VerticalAlignment = Element.ALIGN_MIDDLE;    

        pdfCell4.Colspan = 3;  

        pdfCell1.Border = 0;
        pdfCell2.Border = 0;
        pdfCell3.Border = 0;
        pdfCell4.Border = 0;
        pdfCell5.Border = 0;
        pdfCell6.Border = 0;
        pdfCell7.Border = 0;    

        //add all three cells into PdfTable
        pdfTab.AddCell(pdfCell1);
        pdfTab.AddCell(pdfCell2);
        pdfTab.AddCell(pdfCell3);
        pdfTab.AddCell(pdfCell4);
        pdfTab.AddCell(pdfCell5);
        pdfTab.AddCell(pdfCell6);
        pdfTab.AddCell(pdfCell7);

        pdfTab.TotalWidth = document.PageSize.Width - 80f;
        pdfTab.WidthPercentage = 70;
        //pdfTab.HorizontalAlignment = Element.ALIGN_CENTER;    

        //call WriteSelectedRows of PdfTable. This writes rows from PdfWriter in PdfTable
        //first param is start row. -1 indicates there is no end row and all the rows to be included to write
        //Third and fourth param is x and y position to start writing
        pdfTab.WriteSelectedRows(0, -1, 40, document.PageSize.Height - 30, writer.DirectContent);
        //set pdfContent value

        //Move the pointer and draw line to separate header section from rest of page
        cb.MoveTo(40, document.PageSize.Height - 100);
        cb.LineTo(document.PageSize.Width - 40, document.PageSize.Height - 100);
        cb.Stroke();

        //Move the pointer and draw line to separate footer section from rest of page
        cb.MoveTo(40, document.PageSize.GetBottom(50) );
        cb.LineTo(document.PageSize.Width - 40, document.PageSize.GetBottom(50));
        cb.Stroke();
    }

    public override void OnCloseDocument(PdfWriter writer, Document document)
    {
        base.OnCloseDocument(writer, document);

        headerTemplate.BeginText();
        headerTemplate.SetFontAndSize(bf, 12);
        headerTemplate.SetTextMatrix(0, 0);
        headerTemplate.ShowText((writer.PageNumber - 1).ToString());
        headerTemplate.EndText();

        footerTemplate.BeginText();
        footerTemplate.SetFontAndSize(bf, 12);
        footerTemplate.SetTextMatrix(0, 0);
        footerTemplate.ShowText((writer.PageNumber - 1).ToString());
        footerTemplate.EndText();  
    }
}

j'espère que cela aide!

nous ne parlons plus de iTextSharp. Vous utilisez iText 5 pour .NET. La version actuelle est iText 7 pour .NET.

réponse obsolète:

AddHeader a été déprécié il y a longtemps et a été retiré de iTextSharp. Ajouter des en-têtes et des pieds de page est maintenant fait en utilisant événements. Les exemples sont en Java, mais vous pouvez trouver le port C# des exemples ici et ici (faites défiler jusqu'à l' en bas de la page pour les liens vers les .cs fichiers).

assurez-vous de lire la documentation. Une erreur commune de nombreux développeurs a fait avant vous, est d'ajouter du contenu dans le OnStartPage. Vous ne devez ajouter du contenu que dans le OnEndPage. Il est également évident que vous devez ajouter le contenu à des coordonnées absolues (par exemple en utilisant ColumnText) et que vous devez réserver suffisamment d'espace pour l'en-tête et le pied de page en définissant les marges de votre document correctement.

réponse mise à jour:

si vous êtes nouveau dans iText, vous devez utiliser iText 7 et utiliser event handlers pour ajouter des en-têtes et des pieds de page. Voir chapitre 3 du tutoriel de démarrage iText 7 pour .NET.

quand vous avez un PdfDocument dans la bibliothèque iText 7, vous pouvez ajouter un gestionnaire d'événements:

PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new MyEventHandler());

Ceci est un exemple de dur pour ajouter du texte à une position absolue (en utilisant PdfCanvas):

protected internal class MyEventHandler : IEventHandler {
    public virtual void HandleEvent(Event @event) {
        PdfDocumentEvent docEvent = (PdfDocumentEvent)@event;
        PdfDocument pdfDoc = docEvent.GetDocument();
        PdfPage page = docEvent.GetPage();
        int pageNumber = pdfDoc.GetPageNumber(page);
        Rectangle pageSize = page.GetPageSize();
        PdfCanvas pdfCanvas = new PdfCanvas(page.NewContentStreamBefore(), page.GetResources(), pdfDoc);
        //Add header
        pdfCanvas.BeginText()
            .SetFontAndSize(C03E03_UFO.helvetica, 9)
            .MoveText(pageSize.GetWidth() / 2 - 60, pageSize.GetTop() - 20)
            .ShowText("THE TRUTH IS OUT THERE")
            .MoveText(60, -pageSize.GetTop() + 30)
            .ShowText(pageNumber.ToString())
            .EndText();
        pdfCanvas.release();
    }
}

c'est une manière légèrement plus élevée, en utilisant Canvas:

protected internal class MyEventHandler : IEventHandler {
    public virtual void HandleEvent(Event @event) {
        PdfDocumentEvent docEvent = (PdfDocumentEvent)@event;
        PdfDocument pdfDoc = docEvent.GetDocument();
        PdfPage page = docEvent.GetPage();
        int pageNumber = pdfDoc.GetPageNumber(page);
        Rectangle pageSize = page.GetPageSize();
        PdfCanvas pdfCanvas = new PdfCanvas(page.NewContentStreamBefore(), page.GetResources(), pdfDoc);
        //Add watermark
        Canvas canvas = new Canvas(pdfCanvas, pdfDoc, page.getPageSize());
        canvas.setFontColor(Color.WHITE);
        canvas.setProperty(Property.FONT_SIZE, 60);
        canvas.setProperty(Property.FONT, helveticaBold);
        canvas.showTextAligned(new Paragraph("CONFIDENTIAL"),
            298, 421, pdfDoc.getPageNumber(page),
            TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45);
        pdfCanvas.release();
    }
}

Il y a d'autres façons d'ajouter du contenu à des positions absolues. Ils sont décrits dans les différents iText livres.

les réponses à cette question, bien qu'elles soient correctes, sont inutilement compliquées. Il n'est pas nécessaire d'avoir autant de code pour que le texte apparaisse dans l'en-tête/pied de page. Voici un exemple simple d'ajouter du texte à l'en-tête/pied de page.

la version actuelle de iTextSharp fonctionne en implémentant une classe de callback qui est définie par IPdfPageEvent interface. De ce que je comprends, ce n'est pas une bonne idée d'ajouter des choses pendant le OnStartPage méthode, donc à la place j'utiliserai le OnEndPage page de méthode. Les événements sont déclenchés en fonction de ce qui arrive à PdfWriter

tout d'abord, créez une classe qui implémente IPdfPageEvent. Dans:

      public void OnEndPage(PdfWriter writer, Document document)

fonction, obtain the PdfContentByte objet en appelant

      PdfContentByte cb = writer.DirectContent;

Maintenant, vous pouvez ajouter du texte très facilement:

            ColumnText ct = new ColumnText(cb);

            cb.BeginText();
            cb.SetFontAndSize(BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 12.0f);
            //Note, (0,0) in this case is at the bottom of the document
            cb.SetTextMatrix(document.LeftMargin, document.BottomMargin); 
            cb.ShowText(String.Format("{0} {1}", "Testing Text", "Like this"));
            cb.EndText();

Donc le plein pour l' OnEndPage fonction:

        public void OnEndPage(PdfWriter writer, Document document)
        {
            PdfContentByte cb = writer.DirectContent;
            ColumnText ct = new ColumnText(cb);

            cb.BeginText();
            cb.SetFontAndSize(BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 12.0f);
            cb.SetTextMatrix(document.LeftMargin, document.BottomMargin);
            cb.ShowText(String.Format("{0} {1}", "Testing Text", "Like this"));
            cb.EndText();

        }

cela apparaîtra au bas de votre document. Une dernière chose. Ne pas oublier de donner IPdfPageEvent comme ceci:

     writter.PageEvent = new PDFEvents();

PdfWriter rédacteur de l'objet

pour le en-tête c'est très similaire. Il suffit de retourner l' SetTextMatrix coordonnée y:

     cb.SetTextMatrix(document.LeftMargin, document.PageSize.Height - document.TopMargin);

il suffit d'ajouter cette ligne avant l'ouverture du document (avant):

        document.Header = new HeaderFooter(new Phrase("Header Text"), false);
        document.Open();

pour iTextSharp 4.1.6, la dernière version d'iTextSharp qui a été autorisée comme LGPL la solution fournie par Alvaro Patiño est à la fois simple et efficace.

parce que la documentation est un peu floue, j'aimerais étendre sa réponse avec cet extrait de code qui peut être utilisé pour changer l'apparence de l'en-tête et du pied de page. Par défaut, ils ont une grande taille de police et une bordure épaisse, qui beaucoup de gens veulent changement.

// Parameters passed on to the function that creates the PDF 
String headerText = "Your header text";
String footerText = "Page";

// Define a font and font-size in points (plus f for float) and pick a color
// This one is for both header and footer but you can also create seperate ones
Font fontHeaderFooter = FontFactory.GetFont("arial", 8f);
fontHeaderFooter.Color = Color.GRAY;

// Apply the font to the headerText and create a Phrase with the result
Chunk chkHeader = new Chunk(headerText, fontHeaderFooter);
Phrase p1 = new Phrase(chkHeader);

// create a HeaderFooter element for the header using the Phrase
// The boolean turns numbering on or off
HeaderFooter header = new HeaderFooter(p1, false);

// Remove the border that is set by default
header.Border = Rectangle.NO_BORDER;
// Align the text: 0 is left, 1 center and 2 right.
header.Alignment = 1;

// add the header to the document
document.Header = header;

// The footer is created in an similar way

// If you want to use numbering like in this example, add a whitespace to the
// text because by default there's no space in between them
if (footerText.Substring(footerText.Length - 1) != " ") footerText += " ";

Chunk chkFooter = new Chunk(footerText, fontHeaderFooter);
Phrase p2 = new Phrase(chkFooter);

// Turn on numbering by setting the boolean to true
HeaderFooter footer = new HeaderFooter(p2, true);
footer.Border = Rectangle.NO_BORDER;
footer.Alignment = 1;

document.Footer = footer;

// Open the Document for writing and continue creating its content
document.Open();

Pour plus d'informations, consultez Création d'un fichier Pdf avec iTextSharp et iTextSharp-ajouter du texte avec des morceaux, des Phrases et des paragraphes. Le code source sur GitHub peut également être utile.

Facile des codes qui fonctionnent avec succès:

protected void Page_Load(object sender, EventArgs e)
{
 .
 .       
 using (MemoryStream ms = new MemoryStream())
 {
  .
  .
  iTextSharp.text.Document doc = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4, 36, 36, 54, 54);
  iTextSharp.text.pdf.PdfWriter writer = iTextSharp.text.pdf.PdfWriter.GetInstance(doc, ms);
  writer.PageEvent = new HeaderFooter();
  doc.Open();
  .
  .
  // make your document content..
  .
  .                   
  doc.Close();
  writer.Close();

  // output
  Response.ContentType = "application/pdf;";
  Response.AddHeader("Content-Disposition", "attachment; filename=clientfilename.pdf");
  byte[] pdf = ms.ToArray();
  Response.OutputStream.Write(pdf, 0, pdf.Length);
 }
 .
 .
 .
}
class HeaderFooter : PdfPageEventHelper
{
public override void OnEndPage(PdfWriter writer, Document document)
{

    // Make your table header using PdfPTable and name that tblHeader
    .
    . 
    tblHeader.WriteSelectedRows(0, -1, page.Left + document.LeftMargin, page.Top, writer.DirectContent);
    .
    .
    // Make your table footer using PdfPTable and name that tblFooter
    .
    . 
    tblFooter.WriteSelectedRows(0, -1, page.Left + document.LeftMargin, writer.PageSize.GetBottom(document.BottomMargin), writer.DirectContent);
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using iTextSharp;
using iTextSharp.text;
using iTextSharp.text.pdf;
using DataLayer;

namespace DataMngt.MyCode
{
    public class HeaderFooter : PdfPageEventHelper
    {
        #region Startup_Stuff

        private string[] _headerLines;
        private string _footerLine;

        private DefineFont _boldFont;
        private DefineFont _normalFont;

        private iTextSharp.text.Font fontTxtBold;
        private iTextSharp.text.Font fontTxtRegular;

        private int _fontPointSize = 0;

        private bool hasFooter = false;
        private bool hasHeader = false;

        private int _headerWidth = 0;
        private int _headerHeight = 0;

        private int _footerWidth = 0;
        private int _footerHeight = 0;

        private int _leftMargin = 0;
        private int _rightMargin = 0;
        private int _topMargin = 0;
        private int _bottomMargin = 0;

        private PageNumbers NumberSettings;

        private DateTime runTime = DateTime.Now;             

        public enum PageNumbers
        {
            None,
            HeaderPlacement,
            FooterPlacement
        }

        // This is the contentbyte object of the writer
        PdfContentByte cb;

        PdfTemplate headerTemplate;
        PdfTemplate footerTemplate;

        public string[] headerLines
        {
            get
            {
                return _headerLines;
            }
            set
            {
                _headerLines = value;
                hasHeader = true;
            }
        }

        public string footerLine
        {
            get
            {
                return _footerLine;
            }
            set
            {
                _footerLine = value;
                hasFooter = true;
            }
        }

        public DefineFont boldFont
        {
            get
            {
                return _boldFont;
            }
            set
            {
                _boldFont = value;
            }
        }

        public DefineFont normalFont
        {
            get
            {
                return _normalFont;
            }
            set
            {
                _normalFont = value;
            }
        }

        public int fontPointSize
        {
            get
            {
                return _fontPointSize;
            }
            set
            {
                _fontPointSize = value;
            }
        }

        public int leftMargin
        {
            get
            {
                return _leftMargin;
            }
            set
            {
                _leftMargin = value;
            }
        }

        public int rightMargin
        {
            get
            {
                return _rightMargin;
            }
            set
            {
                _rightMargin = value;
            }
        }

        public int topMargin
        {
            get
            {
                return _topMargin;
            }
            set
            {
                _topMargin = value;
            }
        }

        public int bottomMargin
        {
            get
            {
                return _bottomMargin;
            }
            set
            {
                _bottomMargin = value;
            }
        }

        public int headerheight
        {
            get
            {
                return _headerHeight;
            }
        }

        public int footerHeight
        {
            get
            {
                return _footerHeight;
            }
        }

        public PageNumbers PageNumberSettings
        {
            get
            {
                return NumberSettings;
            }

            set
            {
                NumberSettings = value;
            }
        }

        #endregion

        #region Write_Headers_Footers

        public override void OnEndPage(PdfWriter writer, Document document)
        {
            if (hasHeader)
            {
                // left side is the string array passed in
                // right side is a built in string array (0 = date, 1 = time, 2(optional) = page)
                float[] widths = new float[2] { 90f, 10f };

                PdfPTable hdrTable = new PdfPTable(2);
                hdrTable.TotalWidth = document.PageSize.Width - (_leftMargin + _rightMargin);
                hdrTable.WidthPercentage = 95;
                hdrTable.SetWidths(widths);
                hdrTable.LockedWidth = true;

                for (int hdrIdx = 0; hdrIdx < (_headerLines.Length < 2 ? 2 : _headerLines.Length); hdrIdx ++)
                {
                    string leftLine = (hdrIdx < _headerLines.Length ? _headerLines[hdrIdx] : string.Empty);

                    Paragraph leftPara = new Paragraph(5, leftLine, (hdrIdx == 0 ? fontTxtBold : fontTxtRegular));

                    switch (hdrIdx)
                    {
                        case 0:
                            {
                                leftPara.Font.Size = _fontPointSize;

                                PdfPCell leftCell = new PdfPCell(leftPara);
                                leftCell.HorizontalAlignment = Element.ALIGN_LEFT;
                                leftCell.Border = 0;

                                string rightLine = string.Format(SalesPlanResources.datePara, runTime.ToString(SalesPlanResources.datePrintMask));
                                Paragraph rightPara = new Paragraph(5, rightLine, (hdrIdx == 0 ? fontTxtBold : fontTxtRegular));
                                rightPara.Font.Size = _fontPointSize;

                                PdfPCell rightCell = new PdfPCell(rightPara);
                                rightCell.HorizontalAlignment = Element.ALIGN_LEFT;
                                rightCell.Border = 0;

                                hdrTable.AddCell(leftCell);
                                hdrTable.AddCell(rightCell);

                                break;
                            }

                        case 1:
                            {
                                leftPara.Font.Size = _fontPointSize;

                                PdfPCell leftCell = new PdfPCell(leftPara);
                                leftCell.HorizontalAlignment = Element.ALIGN_LEFT;
                                leftCell.Border = 0;

                                string rightLine = string.Format(SalesPlanResources.timePara, runTime.ToString(SalesPlanResources.timePrintMask));
                                Paragraph rightPara = new Paragraph(5, rightLine, (hdrIdx == 0 ? fontTxtBold : fontTxtRegular));
                                rightPara.Font.Size = _fontPointSize;

                                PdfPCell rightCell = new PdfPCell(rightPara);
                                rightCell.HorizontalAlignment = Element.ALIGN_LEFT;
                                rightCell.Border = 0;

                                hdrTable.AddCell(leftCell);
                                hdrTable.AddCell(rightCell);

                                break;
                            }

                        case 2:
                            {
                                leftPara.Font.Size = _fontPointSize;

                                PdfPCell leftCell = new PdfPCell(leftPara);
                                leftCell.HorizontalAlignment = Element.ALIGN_LEFT;
                                leftCell.Border = 0;

                                string rightLine;
                                if (NumberSettings == PageNumbers.HeaderPlacement)
                                {
                                    rightLine = string.Concat(SalesPlanResources.pagePara, writer.PageNumber.ToString());
                                }
                                else
                                {
                                    rightLine = string.Empty; 
                                }
                                Paragraph rightPara = new Paragraph(5, rightLine, fontTxtRegular);
                                rightPara.Font.Size = _fontPointSize;

                                PdfPCell rightCell = new PdfPCell(rightPara);
                                rightCell.HorizontalAlignment = Element.ALIGN_LEFT;
                                rightCell.Border = 0;

                                hdrTable.AddCell(leftCell);
                                hdrTable.AddCell(rightCell);

                                break;
                            }

                        default:
                            {
                                leftPara.Font.Size = _fontPointSize;

                                PdfPCell leftCell = new PdfPCell(leftPara);
                                leftCell.HorizontalAlignment = Element.ALIGN_LEFT;
                                leftCell.Border = 0;
                                leftCell.Colspan = 2;                               

                                hdrTable.AddCell(leftCell);

                                break;
                            }
                    }
                }

                hdrTable.WriteSelectedRows(0, -1, _leftMargin, document.PageSize.Height - _topMargin, writer.DirectContent);

                //Move the pointer and draw line to separate header section from rest of page
                cb.MoveTo(_leftMargin, document.Top + 10);
                cb.LineTo(document.PageSize.Width - _leftMargin, document.Top + 10);
                cb.Stroke();
            }

            if (hasFooter)
            {
                // footer line is the width of the page so it is centered horizontally 
                PdfPTable ftrTable = new PdfPTable(1);
                float[] widths = new float[1] {100 };

                ftrTable.TotalWidth = document.PageSize.Width - 10;
                ftrTable.WidthPercentage = 95;
                ftrTable.SetWidths(widths);

                string OneLine;

                if (NumberSettings == PageNumbers.FooterPlacement)
                {
                    OneLine = string.Concat(_footerLine, writer.PageNumber.ToString());
                }
                else
                {
                    OneLine = _footerLine;
                }

                Paragraph onePara = new Paragraph(0, OneLine, fontTxtRegular);
                onePara.Font.Size = _fontPointSize;

                PdfPCell oneCell = new PdfPCell(onePara);
                oneCell.HorizontalAlignment = Element.ALIGN_CENTER; 
                oneCell.Border = 0;
                ftrTable.AddCell(oneCell);

                ftrTable.WriteSelectedRows(0, -1, _leftMargin, (_footerHeight), writer.DirectContent);

                //Move the pointer and draw line to separate footer section from rest of page
                cb.MoveTo(_leftMargin, document.PageSize.GetBottom(_footerHeight + 2));
                cb.LineTo(document.PageSize.Width - _leftMargin, document.PageSize.GetBottom(_footerHeight + 2));
                cb.Stroke();
            }
        }

        #endregion


        #region Setup_Headers_Footers_Happens_here

        public override void OnOpenDocument(PdfWriter writer, Document document)
        {
            // create the fonts that are to be used
            // first the hightlight or Bold font
            fontTxtBold = FontFactory.GetFont(_boldFont.fontFamily, _boldFont.fontSize, _boldFont.foreColor);
            if (_boldFont.isBold)
            {
                fontTxtBold.SetStyle(Font.BOLD);
            }
            if (_boldFont.isItalic)
            {
                fontTxtBold.SetStyle(Font.ITALIC);
            }
            if (_boldFont.isUnderlined)
            {
                fontTxtBold.SetStyle(Font.UNDERLINE);
            }

            // next the normal font
            fontTxtRegular = FontFactory.GetFont(_normalFont.fontFamily, _normalFont.fontSize, _normalFont.foreColor);
            if (_normalFont.isBold)
            {
                fontTxtRegular.SetStyle(Font.BOLD);
            }
            if (_normalFont.isItalic)
            {
                fontTxtRegular.SetStyle(Font.ITALIC);
            }
            if (_normalFont.isUnderlined)
            {
                fontTxtRegular.SetStyle(Font.UNDERLINE);
            }

            // now build the header and footer templates
            try
            {
                float pageHeight = document.PageSize.Height;
                float pageWidth = document.PageSize.Width;

                _headerWidth = (int)pageWidth - ((int)_rightMargin + (int)_leftMargin);
                _footerWidth = _headerWidth;

                if (hasHeader)
                {
                    // i basically dummy build the headers so i can trial fit them and see how much space they take.
                    float[] widths = new float[1] { 90f };

                    PdfPTable hdrTable = new PdfPTable(1);
                    hdrTable.TotalWidth = document.PageSize.Width - (_leftMargin + _rightMargin);
                    hdrTable.WidthPercentage = 95;
                    hdrTable.SetWidths(widths);
                    hdrTable.LockedWidth = true;

                    _headerHeight = 0;

                    for (int hdrIdx = 0; hdrIdx < (_headerLines.Length < 2 ? 2 : _headerLines.Length); hdrIdx++)
                    {
                        Paragraph hdrPara = new Paragraph(5, hdrIdx > _headerLines.Length - 1 ? string.Empty : _headerLines[hdrIdx], (hdrIdx > 0 ? fontTxtRegular : fontTxtBold));
                        PdfPCell hdrCell = new PdfPCell(hdrPara);
                        hdrCell.HorizontalAlignment = Element.ALIGN_LEFT;
                        hdrCell.Border = 0;
                        hdrTable.AddCell(hdrCell);
                        _headerHeight = _headerHeight + (int)hdrTable.GetRowHeight(hdrIdx);
                    }

                    // iTextSharp underestimates the size of each line so fudge it a little 
                    // this gives me 3 extra lines to play with on the spacing
                    _headerHeight = _headerHeight + (_fontPointSize * 3);

                }

                if (hasFooter)
                {
                    _footerHeight = (_fontPointSize * 2);
                }

                document.SetMargins(_leftMargin, _rightMargin, (_topMargin + _headerHeight), _footerHeight);

                cb = writer.DirectContent;

                if (hasHeader)
                {
                    headerTemplate = cb.CreateTemplate(_headerWidth, _headerHeight);
                }

                if (hasFooter)
                {
                    footerTemplate = cb.CreateTemplate(_footerWidth, _footerHeight);
                }
            }
            catch (DocumentException de)
            {

            }
            catch (System.IO.IOException ioe)
            {

            }
        }

        #endregion

        #region Cleanup_Doc_Processing

        public override void OnCloseDocument(PdfWriter writer, Document document)
        {
            base.OnCloseDocument(writer, document);

            if (hasHeader)
            {
                headerTemplate.BeginText();
                headerTemplate.SetTextMatrix(0, 0);

                if (NumberSettings == PageNumbers.HeaderPlacement)
                {
                }

                headerTemplate.EndText();
            }

            if (hasFooter)
            {
                footerTemplate.BeginText();
                footerTemplate.SetTextMatrix(0, 0);

                if (NumberSettings == PageNumbers.FooterPlacement)
                {
                }

                footerTemplate.EndText();
            }
        }

        #endregion

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using iTextSharp;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace DataMngt.MyCode
{

    // used to define the fonts passed into the header and footer class
    public struct DefineFont
    {
        public string fontFamily { get; set; }
        public int fontSize { get; set; }
        public bool isBold { get; set; }
        public bool isItalic { get; set; }
        public bool isUnderlined { get; set; }
        public BaseColor foreColor { get; set; }
    }
}

Utilisation:

 Document pdfDoc = new Document(PageSize.LEGAL.Rotate(), 10, 10, 25, 25);
 System.IO.MemoryStream mStream = new System.IO.MemoryStream();
 PdfWriter writer = PdfWriter.GetInstance(pdfDoc, mStream);
 MyCode.HeaderFooter headers = new MyCode.HeaderFooter();
 writer.PageEvent = headers;

.. .. Construisez le réseau de cordes pour les en-têtes ...

DefineFont passFont = new DefineFont();

    // always set this to the largest font used
    headers.fontPointSize = 8;

    // set up the highlight or bold font
    passFont.fontFamily = "Helvetica";
    passFont.fontSize = 8;
    passFont.isBold = true;
    passFont.isItalic = false;
    passFont.isUnderlined = false;
    passFont.foreColor = BaseColor.BLACK;

    headers.boldFont = passFont;

    // now setup the normal text font
    passFont.fontSize = 7;
    passFont.isBold = false;

    headers.normalFont = passFont;

    headers.leftMargin = 10;
    headers.bottomMargin = 25;
    headers.rightMargin = 10;
    headers.topMargin = 25;

    headers.PageNumberSettings = HeaderFooter.PageNumbers.FooterPlacement;

    headers.footerLine = "Page";
    headers.headerLines = parmLines.ToArray();

    pdfDoc.SetMargins(headers.leftMargin, headers.rightMargin, headers.topMargin + headers.headerheight, headers.bottomMargin + headers.footerHeight);
    pdfDoc.Open();

    // the new page is necessary due to a bug in in the current version of itextsharp
    pdfDoc.NewPage();

... maintenant, vos en-têtes et pied de page seront traités automatiquement

pdfDoc.Open();
Paragraph para = new Paragraph("Hello World", new Font(Font.FontFamily.HELVETICA, 22));
para.Alignment = Element.ALIGN_CENTER;
pdfDoc.Add(para);
pdfDoc.Add(new Paragraph("\r\n"));
htmlparser.Parse(sr);
pdfDoc.Close();