在C#中将大型PDF文件拆分为多个PDF

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

public class PdfSplitter
{
    public static void SplitPdf(string inputFilePath, string outputDirectoryPath, int pageSize)
    {
        using (PdfReader reader = new PdfReader(inputFilePath))
        {
            int pageCount = reader.NumberOfPages;
            
            for (int i = 1; i <= pageCount; i += pageSize)
            {
                int startPage = i;
                int endPage = Math.Min(i + pageSize - 1, pageCount);
                
                string outputFilePath = Path.Combine(outputDirectoryPath, $"part_{i}_{endPage}.pdf");
                
                using (Document document = new Document())
                {
                    using (FileStream outputStream = new FileStream(outputFilePath, FileMode.Create))
                    {
                        PdfCopy copy = new PdfCopy(document, outputStream);
                        document.Open();
                        
                        for (int page = startPage; page <= endPage; page++)
                        {
                            PdfImportedPage importedPage = copy.GetImportedPage(reader, page);
                            copy.AddPage(importedPage);
                        }
                        
                        document.Close();
                    }
                }
            }
        }
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        string inputFilePath = "path_to_input_file.pdf";
        string outputDirectoryPath = "path_to_output_directory";
        int pageSize = 10; // 每个拆分的PDF文件包含的页面数量
        
        PdfSplitter.SplitPdf(inputFilePath, outputDirectoryPath, pageSize);
    }
}