使用iTextSharp 5.0.2.0在pdf文件中添加页码

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

public class AddPageNumbers
{
    public static void Main()
    {
        // 输入和输出文件路径
        string inputFilePath = "input.pdf";
        string outputFilePath = "output_with_page_numbers.pdf";

        // 打开现有的 PDF 文件
        using (PdfReader reader = new PdfReader(inputFilePath))
        {
            using (FileStream fileStream = new FileStream(outputFilePath, FileMode.Create, FileAccess.Write))
            {
                // 创建一个 PdfStamper 对象
                PdfStamper stamper = new PdfStamper(reader, fileStream);

                // 获取页数
                int pageCount = reader.NumberOfPages;

                // 遍历每一页并添加页码
                for (int i = 1; i <= pageCount; i++)
                {
                    // 创建页脚
                    ColumnText columnText = new ColumnText(stamper.GetUnderContent(i));
                    columnText.SetSimpleColumn(new Rectangle(36, 36, 559, 80)); // 设置页脚位置

                    // 添加页码
                    columnText.AddText(new Chunk(String.Format("Page {0} of {1}", i, pageCount), new Font(Font.FontFamily.HELVETICA, 12)));

                    // 渲染页脚
                    columnText.Go();
                }

                // 关闭 PdfStamper
                stamper.Close();
            }
        }

        Console.WriteLine("页码已成功添加到 PDF 文件中。");
    }
}