C#拆分单页PDF

   using iTextSharp.text;
using iTextSharp.text.pdf;
...


   // 目标分割pdf文件
    string inputFilePath = @"623.pdf";

    // 创建输出文件所在文件夹
    string outputFolder = "NewFile";
    string rootPath = System.IO.Directory.GetCurrentDirectory();
    string folderAll = Path.Combine(rootPath, outputFolder);
    if (!Directory.Exists(folderAll))
    {
        Directory.CreateDirectory(folderAll);
    }

    // 操作pdf分割
    using (PdfReader reader = new PdfReader(inputFilePath))
    {
        for (int i = 1; i <= reader.NumberOfPages; i++)
        {
            string newFilePath = Path.Combine(outputFolder, $"page_{i}.pdf");

            using (Document document = new Document())
            using (PdfCopy copy = new PdfCopy(document, new FileStream(newFilePath, FileMode.Create)))
            {
                document.Open();
                PdfImportedPage pp = copy.GetImportedPage(reader, i);
                copy.AddPage(pp);
                document.Close();
            }
        }
    }

    Console.WriteLine("PDF 分割完成！");