C# iText split PDF C# 拆分PDF

Nuget安装iText7

using iText.Kernel.Utils;
using iText.Kernel.Pdf;
using System.IO;

public class MyPdfSplitter : PdfSplitter
    {
        private readonly string _destFolder;
        private int _pageNumber;
        public MyPdfSplitter(PdfDocument pdfDocument, string destFolder) : base(pdfDocument)
        {
            _destFolder = destFolder;
        }

        protected override PdfWriter GetNextPdfWriter(PageRange documentPageRange)
        {
            _pageNumber++;
            return new PdfWriter(Path.Combine(_destFolder, $"pdf{_pageNumber}.pdf"));
        }
    }


static void ITextSplitPdf()
        {
            string rawPdfFile = @"C:\Users\ffu\Downloads\Essential_Javascript_--_A_Javascript_Tutorial.pdf";
            string splitPDFDir = Directory.GetCurrentDirectory() + "//";
            using (var pdfDoc = new PdfDocument(new PdfReader(rawPdfFile)))
            {
                var splitDocuments = new MyPdfSplitter(pdfDoc, splitPDFDir).SplitByPageCount(1);
                foreach (var splitDocument in splitDocuments)
                {
                    splitDocument.Close();
                }
            }
        }