有没有直接的方法使用iTextSharp将一个PDF文档附加到另一个？

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

namespace MergePDFs
{
    class Program
    {
        static void Main(string[] args)
        {
            string inputPDF1 = "path/to/inputPDF1.pdf";
            string inputPDF2 = "path/to/inputPDF2.pdf";
            string outputPDF = "path/to/outputPDF.pdf";

            using (Document document = new Document())
            {
                using (FileStream fs = new FileStream(outputPDF, FileMode.Create))
                {
                    using (PdfCopy pdfCopy = new PdfCopy(document, fs))
                    {
                        document.Open();

                        PdfReader pdfReader1 = new PdfReader(inputPDF1);
                        pdfCopy.AddDocument(pdfReader1);

                        PdfReader pdfReader2 = new PdfReader(inputPDF2);
                        pdfCopy.AddDocument(pdfReader2);

                        document.Close();
                    }
                }
            }
        }
    }
}