Wie man Seitenzahlen in PDF mit iTextSharp in C# hinzufügt

How to Add Page Numbers in PDF using iTextSharp C#

1. Create a new C# project using any IDE.
2. Create a new PDF object.
3. Add page numbers to the HTML footer.
4. Create a PDF from HTML content.
5. Save the PDF file to your computer.

What is IronPDF

IronPDF is a robust PDF .NET Framework that developers use to easily create, view, and edit PDFs. IronPDF is a sophisticated tool that runs on a chromium engine internally. It can convert HTML5, JavaScript, CSS, and image files to PDF, add custom Headers and Footers, and produce PDFs precisely as they appear in a browser. Many online and net formats, including HTML, ASPX, Razor View, and MVC, are supported by IronPDF.

Install-Package IronPdf

What is iTextSharp

iTextSharp is a flexible library for producing and modifying PDF documents in C#. It offers several features, such as encryption, PDF merging, text and image extraction, and much more. iTextSharp is an efficient tool for numerous tasks, including adding page numbers to PDFs.

Install-Package iText7
Install-Package itext7.pdfhtml

Install-Package iText7
Install-Package itext7.pdfhtml

Adding Page Numbers using IronPDF

Adding page numbers to PDF files is made simple through IronPDF's comprehensive library. To illustrate, see the code below:

using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        // Initialize the IronPdf renderer
        var renderer = new IronPdf.HtmlToPdf();

        // HTML content to convert to PDF
        string header = "<h1>Hello Ironpdf!</h1>";

        // Render the HTML content to PDF
        PdfDocument pdf = renderer.RenderHtmlAsPdf(header);

        // Define the footer with page number placeholders
        HtmlHeaderFooter htmlFooter = new HtmlHeaderFooter
        {
            HtmlFragment = "<center><i>{page} of {total-pages}</i></center>"
        };

        // Add footer to the PDF
        pdf.AddHtmlFooters(htmlFooter);

        // Save the output PDF file
        pdf.SaveAs("output.pdf");
    }
}

using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        // Initialize the IronPdf renderer
        var renderer = new IronPdf.HtmlToPdf();

        // HTML content to convert to PDF
        string header = "<h1>Hello Ironpdf!</h1>";

        // Render the HTML content to PDF
        PdfDocument pdf = renderer.RenderHtmlAsPdf(header);

        // Define the footer with page number placeholders
        HtmlHeaderFooter htmlFooter = new HtmlHeaderFooter
        {
            HtmlFragment = "<center><i>{page} of {total-pages}</i></center>"
        };

        // Add footer to the PDF
        pdf.AddHtmlFooters(htmlFooter);

        // Save the output PDF file
        pdf.SaveAs("output.pdf");
    }
}

Imports IronPdf

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Initialize the IronPdf renderer
		Dim renderer = New IronPdf.HtmlToPdf()

		' HTML content to convert to PDF
		Dim header As String = "<h1>Hello Ironpdf!</h1>"

		' Render the HTML content to PDF
		Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(header)

		' Define the footer with page number placeholders
		Dim htmlFooter As New HtmlHeaderFooter With {.HtmlFragment = "<center><i>{page} of {total-pages}</i></center>"}

		' Add footer to the PDF
		pdf.AddHtmlFooters(htmlFooter)

		' Save the output PDF file
		pdf.SaveAs("output.pdf")
	End Sub
End Class

Adding Page Numbers using iTextSharp

First, let's use iTextSharp to generate a new PDF document. Here's a basic illustration of how to make a new PDF document with page numbers:

using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace ConsoleApp1
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Create a new PDF document
            Document document = new Document();
            PdfWriter writer = PdfWriter.GetInstance(document, new FileStream("output.pdf", FileMode.Create));

            // Open the document to add content
            document.Open();
            document.Add(new Paragraph("Hello, world!"));

            // Attach page number event to PDF writer
            writer.PageEvent = new PageNumberEventHandler();

            // Close the document
            document.Close();
        }
    }

    public class PageNumberEventHandler : PdfPageEventHelper
    {
        public override void OnEndPage(PdfWriter writer, Document document)
        {
            base.OnEndPage(writer, document);

            // Create a table for the page number
            PdfPTable table = new PdfPTable(1);
            table.TotalWidth = 300f;
            table.HorizontalAlignment = Element.ALIGN_CENTER;

            // Add page number to the table cell
            PdfPCell cell = new PdfPCell(new Phrase($"Page {writer.PageNumber}"));
            cell.Border = 0;
            table.AddCell(cell);

            // Write the table at the bottom of the page
            table.WriteSelectedRows(0, -1, 150, document.Bottom, writer.DirectContent);
        }
    }
}

using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace ConsoleApp1
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Create a new PDF document
            Document document = new Document();
            PdfWriter writer = PdfWriter.GetInstance(document, new FileStream("output.pdf", FileMode.Create));

            // Open the document to add content
            document.Open();
            document.Add(new Paragraph("Hello, world!"));

            // Attach page number event to PDF writer
            writer.PageEvent = new PageNumberEventHandler();

            // Close the document
            document.Close();
        }
    }

    public class PageNumberEventHandler : PdfPageEventHelper
    {
        public override void OnEndPage(PdfWriter writer, Document document)
        {
            base.OnEndPage(writer, document);

            // Create a table for the page number
            PdfPTable table = new PdfPTable(1);
            table.TotalWidth = 300f;
            table.HorizontalAlignment = Element.ALIGN_CENTER;

            // Add page number to the table cell
            PdfPCell cell = new PdfPCell(new Phrase($"Page {writer.PageNumber}"));
            cell.Border = 0;
            table.AddCell(cell);

            // Write the table at the bottom of the page
            table.WriteSelectedRows(0, -1, 150, document.Bottom, writer.DirectContent);
        }
    }
}

Imports System.IO
Imports iTextSharp.text
Imports iTextSharp.text.pdf

Namespace ConsoleApp1
	Friend Class Program
		Shared Sub Main(ByVal args() As String)
			' Create a new PDF document
			Dim document As New Document()
			Dim writer As PdfWriter = PdfWriter.GetInstance(document, New FileStream("output.pdf", FileMode.Create))

			' Open the document to add content
			document.Open()
			document.Add(New Paragraph("Hello, world!"))

			' Attach page number event to PDF writer
			writer.PageEvent = New PageNumberEventHandler()

			' Close the document
			document.Close()
		End Sub
	End Class

	Public Class PageNumberEventHandler
		Inherits PdfPageEventHelper

		Public Overrides Sub OnEndPage(ByVal writer As PdfWriter, ByVal document As Document)
			MyBase.OnEndPage(writer, document)

			' Create a table for the page number
			Dim table As New PdfPTable(1)
			table.TotalWidth = 300F
			table.HorizontalAlignment = Element.ALIGN_CENTER

			' Add page number to the table cell
			Dim cell As New PdfPCell(New Phrase($"Page {writer.PageNumber}"))
			cell.Border = 0
			table.AddCell(cell)

			' Write the table at the bottom of the page
			table.WriteSelectedRows(0, -1, 150, document.Bottom, writer.DirectContent)
		End Sub
	End Class
End Namespace

Conclusion

In summary, IronPDF's specialization, usability, and seamless integration with .NET environments position it as the best option for scenarios requiring HTML to PDF conversion and related functionalities, even though iTextSharp is still a strong competitor in the landscape of C# PDF manipulation libraries. With IronPDF, you can create invoices, reports, and dynamically generated documents from HTML content with the ease, effectiveness, and adaptability required to succeed in the modern development environment.

A permanent license, upgrade options, and a year of software maintenance are all included in IronPDF's Lite edition. The watermarked trial period allows users to assess the product in practical settings. Visit the license page to learn more. For more details about Iron Software, visit their website.