Designing Page Tree in C# and .NET

With PDF.Net, you can retrieve, create, delete, or reorder pages of a PDF document in your C# or VB.NET application.

The pages of a PDF document are accessed through a structure called the page tree, which defines the order of the pages in the document. The tree structure allows PDF consumer applications with limited memory to quickly open PDF documents containing thousands of pages. For more information, see Document Structure help page.

The following example shows how to create a page tree structure from scratch.

Complete code

using System;
using System.IO;
using SautinSoft;
using SautinSoft.Pdf;
using SautinSoft.Pdf.Content;

namespace Sample
{
    class Sample
    {
        /// <summary>
        /// Create a page tree.
        /// </summary>
        /// <remarks>
        /// Details: https://sautinsoft.com/products/pdf/help/net/developer-guide/page-tree.php
        /// </remarks>
        static void Main(string[] args)
        {
            // Before starting this example, please get a free 100-day trial key:
            // https://sautinsoft.com/start-for-free/

            // Apply the key here:
            // PdfDocument.SetLicense("...");

            using (var document = new PdfDocument())
            {
                using (var formattedText = new PdfFormattedText())
                {
                    // Get a page tree root node.
                    var rootNode = document.Pages;
                    // Set page rotation for a whole set of pages.
                    rootNode.Rotate = 90;

                    // Create a left page tree node.
                    var childNode = rootNode.Kids.AddPages();
                    // Overwrite a parent tree node rotation value.
                    childNode.Rotate = 0;

                    // Create a first page.
                    var page = childNode.Kids.AddPage();
                    formattedText.Append("FIRST PAGE");
                    page.Content.DrawText(formattedText, new PdfPoint(0, 0));

                    // Create a second page and set a page media box value.
                    page = childNode.Kids.AddPage();
                    page.SetMediaBox(0, 0, 200, 400);
                    formattedText.Clear();
                    formattedText.Append("SECOND PAGE");
                    page.Content.DrawText(formattedText, new PdfPoint(0, 0));

                    // Create a right page tree node.
                    childNode = rootNode.Kids.AddPages();
                    // Set a media box value.
                    childNode.SetMediaBox(0, 0, 100, 200);

                    // Create a third page.
                    page = childNode.Kids.AddPage();
                    formattedText.Clear();
                    formattedText.Append("THIRD PAGE");
                    page.Content.DrawText(formattedText, new PdfPoint(0, 0));

                    // Create a fourth page and overwrite a rotation value.
                    page = childNode.Kids.AddPage();
                    page.Rotate = 0;
                    formattedText.Clear();
                    formattedText.Append("FOURTH PAGE");
                    page.Content.DrawText(formattedText, new PdfPoint(0, 0));
                }

                document.Save("Page Tree.pdf");
            }

        }
    }
}

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