C#でのPDFの分割に関するiTextSharpとIronPDFの比較

using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        string file = "input.pdf";
        // The folder to save the split PDFs
        string outputFolder = "output_split";
        int numberOfSplitFiles = 3; // Specify how many parts you want to split the PDF into
        // Call the SplitPdf method to split the PDF
        SplitPdfUsingIronPDF(file, outputFolder, numberOfSplitFiles);
    }

    static void SplitPdfUsingIronPDF(string inputPdfPath, string outputFolder, int numberOfSplitFiles)
    {
        // Load the input PDF
        PdfDocument sourceFile = PdfDocument.FromFile(inputPdfPath);

        // Initialize page range values
        int firstPage = 1;
        int lastPage = 2;
        int totalPageInOneFile = sourceFile.PageCount / numberOfSplitFiles;

        for (int i = 1; i <= numberOfSplitFiles; i++)
        {
            // Copy multiple pages into a new document
            PdfDocument newSplitPDF = sourceFile.CopyPages(firstPage, lastPage);

            // Generate the output file path
            string name = $@"{outputFolder}\SplitPDF_IronPDF_{i}.pdf";

            // Save the new split PDF
            newSplitPDF.SaveAs(name);

            // Update page range values for the next iteration
            firstPage = lastPage + 1;
            lastPage += totalPageInOneFile;
        }
    }
}

Imports IronPdf

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		Dim file As String = "input.pdf"
		' The folder to save the split PDFs
		Dim outputFolder As String = "output_split"
		Dim numberOfSplitFiles As Integer = 3 ' Specify how many parts you want to split the PDF into
		' Call the SplitPdf method to split the PDF
		SplitPdfUsingIronPDF(file, outputFolder, numberOfSplitFiles)
	End Sub

	Private Shared Sub SplitPdfUsingIronPDF(ByVal inputPdfPath As String, ByVal outputFolder As String, ByVal numberOfSplitFiles As Integer)
		' Load the input PDF
		Dim sourceFile As PdfDocument = PdfDocument.FromFile(inputPdfPath)

		' Initialize page range values
		Dim firstPage As Integer = 1
		Dim lastPage As Integer = 2
'INSTANT VB WARNING: Instant VB cannot determine whether both operands of this division are integer types - if they are then you should use the VB integer division operator:
		Dim totalPageInOneFile As Integer = sourceFile.PageCount / numberOfSplitFiles

		For i As Integer = 1 To numberOfSplitFiles
			' Copy multiple pages into a new document
			Dim newSplitPDF As PdfDocument = sourceFile.CopyPages(firstPage, lastPage)

			' Generate the output file path
			Dim name As String = $"{outputFolder}\SplitPDF_IronPDF_{i}.pdf"

			' Save the new split PDF
			newSplitPDF.SaveAs(name)

			' Update page range values for the next iteration
			firstPage = lastPage + 1
			lastPage += totalPageInOneFile
		Next i
	End Sub
End Class

using System;
using iText.Kernel.Pdf;

class Program
{
    static void Main(string[] args)
    {
        string inputPath = "input.pdf";
        // Output PDF files path (prefix for the generated files)
        string outputPath = "output_split";
        int numberOfSplitFiles = 3; // Specify how many parts you want to split the PDF into
        // Call the SplitPdf method to split the PDF
        SplitPdfUsingiTextSharp(inputPath, outputPath, numberOfSplitFiles);
    }

    static void SplitPdfUsingiTextSharp(string inputPdfPath, string outputFolder, int numberOfSplitFiles)
    {
        using (PdfReader reader = new PdfReader(inputPdfPath))
        {
            using (PdfDocument doc = new PdfDocument(reader))
            {
                // Calculate the number of pages for each split file
                int totalPageInOneFile = doc.GetNumberOfPages() / numberOfSplitFiles;
                int firstPage = 1;
                int lastPage = totalPageInOneFile;

                for (int i = 1; i <= numberOfSplitFiles; i++)
                {
                    // Generate the output file path
                    string filename = $@"{outputFolder}\SplitPDF_iTextSharp_{i}.pdf";

                    // Create a new document and attach a writer for the specified output file
                    using (PdfDocument pdfDocument = new PdfDocument(new PdfWriter(filename)))
                    {
                        // Copy pages from the original document to the new document
                        doc.CopyPagesTo(firstPage, lastPage, pdfDocument);
                    }

                    // Update page range values for the next iteration
                    firstPage = lastPage + 1;
                    lastPage += totalPageInOneFile;
                }
            }
        }
    }
}

Imports System
Imports iText.Kernel.Pdf

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		Dim inputPath As String = "input.pdf"
		' Output PDF files path (prefix for the generated files)
		Dim outputPath As String = "output_split"
		Dim numberOfSplitFiles As Integer = 3 ' Specify how many parts you want to split the PDF into
		' Call the SplitPdf method to split the PDF
		SplitPdfUsingiTextSharp(inputPath, outputPath, numberOfSplitFiles)
	End Sub

	Private Shared Sub SplitPdfUsingiTextSharp(ByVal inputPdfPath As String, ByVal outputFolder As String, ByVal numberOfSplitFiles As Integer)
		Using reader As New PdfReader(inputPdfPath)
			Using doc As New PdfDocument(reader)
				' Calculate the number of pages for each split file
'INSTANT VB WARNING: Instant VB cannot determine whether both operands of this division are integer types - if they are then you should use the VB integer division operator:
				Dim totalPageInOneFile As Integer = doc.GetNumberOfPages() / numberOfSplitFiles
				Dim firstPage As Integer = 1
				Dim lastPage As Integer = totalPageInOneFile

				For i As Integer = 1 To numberOfSplitFiles
					' Generate the output file path
					Dim filename As String = $"{outputFolder}\SplitPDF_iTextSharp_{i}.pdf"

					' Create a new document and attach a writer for the specified output file
					Using pdfDocument As New PdfDocument(New PdfWriter(filename))
						' Copy pages from the original document to the new document
						doc.CopyPagesTo(firstPage, lastPage, pdfDocument)
					End Using

					' Update page range values for the next iteration
					firstPage = lastPage + 1
					lastPage += totalPageInOneFile
				Next i
			End Using
		End Using
	End Sub
End Class