Split PDF Files in WinUI

Overview

The Syncfusion WinUI PDF library that allows users to split a PDF file into multiple sub-documents quickly and accurately. It also allows users to split, combine, import, and append PDFs.

Split PDF WinUI

How to split PDF files using WinUI

Install the Syncfusion.Pdf.Net NuGet package in your project.
Create FileStream objects to represent input PDF files.
Create a PdfLoadedDocument object by passing the FileStream object.
Create a new PDF document using the PdfDocument class.
Use the ImportPage method of the PdfDocumentBase class to split a PDF document into multiple files.
Save the PdfDocument object to the FileStream object.

Here is an example of how to split PDF files in C# using the Syncfusion WinUI PDF library. You can split a PDF file into a single page or multiple page PDF document with just a few lines of code.

c#
//Open an existing PDF document.
Assembly assembly = typeof(MainWindow).GetTypeInfo().Assembly;
Stream inputFileStream = assembly.GetManifestResourceStream("Input.pdf");
//Load the PDF document from stream
using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(inputFileStream)) 
{
    //Iterate over the pages 
    for (int pageIndex = 0; pageIndex < loadedDocument.PageCount; pageIndex++) 
    {
        //Create a new PdfDocument object
        using (PdfDocument outputDocument = new PdfDocument())   
        {
            //Import the page from the loadedDocument to the outputDocument
            outputDocument.ImportPage(loadedDocument, pageIndex); 
            //Give file path
            string filePath = "Result"+pageIndex+".pdf";
            //Save the document into a filestream object
            using (FileStream outputFileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write))
            {
                outputDocument.Save(outputFileStream);
            }
        }
    }
}

PDF split options

Split a range of pages into a separate PDF document

A range of pages can be split into a separate PDF document.

c#
//Open an existing PDF document.
Assembly assembly = typeof(MainWindow).GetTypeInfo().Assembly;
Stream inputStream = assembly.GetManifestResourceStream("Input.pdf");
using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(inputStream))
{
    int[,] values = new int[,] { { 0, 2 }, { 2, 4 } };
    loadedDocument.DocumentSplitEvent += (object sender, PdfDocumentSplitEventArgs args) =>
    {
        string filePath = Guid.NewGuid().ToString()+".pdf";
        //Save the resulting document.
        FileStream outputStream = new FileStream(filePath, FileMode.CreateNew);
        args.PdfDocumentData.CopyTo(outputStream);
        outputStream.Close();
    };
    //Spit the document by ranges.
    loadedDocument.SplitByRanges(values);
}

Import or delete certain pages from a PDF file

Users can get specific pages or delete certain pages from a PDF document.

c#
//Open an existing PDF document.
Assembly assembly = typeof(MainWindow).GetTypeInfo().Assembly;
Stream inputFilestream = assembly.GetManifestResourceStream("Input.pdf");
//Load the PDF document from stream
using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(inputFilestream))
{
    //Creates a new PDF document
    using (PdfDocument outputDocument = new PdfDocument())
    {
        //Remove the first page in the PDF document  
        loadedDocument.Pages.RemoveAt(0);
        //Import certain pages to the new PDF document 
        outputDocument.ImportPage(loadedDocument, 0);
        //Give file path
        string filePath = "Split"+".pdf";
        //Save the document into a filestream object 
        using (FileStream outputFileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write))
            {
                outputDocument.Save(outputFileStream);
            }
    }
}

Split a document based on bookmarks

Split a PDF document based on bookmarks.

c#
//Open an existing PDF document
Assembly assembly = typeof(MainWindow).GetTypeInfo().Assembly;
Stream inputFilestream = assembly.GetManifestResourceStream("Bookmark.pdf");
//Load the PDF document from stream
using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(inputFilestream))
{
    //Create bookmark object
    PdfBookmarkBase bookmarks = loadedDocument.Bookmarks;
    //Load the PDF document from stream
    foreach (PdfBookmark bookmark in bookmarks)
    {
        if (bookmark.Destination != null)
        {
            if (bookmark.Destination.Page != null)
            {
                int endIndex = bookmark.Destination.PageIndex;
                //Create a new PDF document
                using (PdfDocument document = new PdfDocument())
                {
                    foreach (PdfLoadedBookmark childBookmark in bookmark)
                    {
                        endIndex = childBookmark.Destination.PageIndex;
                    }
                    //Import the pages to the new PDF document
                    document.ImportPageRange(loadedDocument, bookmark.Destination.PageIndex, endIndex);
                    //Give file path
                    string filePath = bookmark.Title +".pdf";
                    //Save the PDF file with the bookamark title's name.
                    using (var outputFileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write))
                    {
                        document.Save(outputFileStream);
                    }
                }
            }
        }
    }
}