Create a page tree in C# and VB.NET

With GemBox.Pdf, you can get, create, remove or reorder PDF document pages in your C# or VB.NET application.

The pages of a PDF document are accessed through a structure known as the page tree, which defines the ordering of pages in the document. The tree structure allows PDF consumer applications, using only limited memory, to quickly open a PDF document containing thousands of pages. For more information, see Document Structure help page.

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

PDF page tree created with GemBox.Pdf C#/VB.NET library
Screenshot of PDF pages created with GemBox.Pdf library
using GemBox.Pdf;
using GemBox.Pdf.Content;

class Program
{
    static void Main()
    {
        // If using Professional version, put your serial key below.
        ComponentInfo.SetLicense("FREE-LIMITED-KEY");

        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");
        }
    }
}
Imports GemBox.Pdf
Imports GemBox.Pdf.Content

Module Program

    Sub Main()

        ' If using Professional version, put your serial key below.
        ComponentInfo.SetLicense("FREE-LIMITED-KEY")

        Using document = New PdfDocument()

            Using formattedText = New PdfFormattedText()

                ' Get a page tree root node.
                Dim rootNode = document.Pages
                ' Set page rotation for a whole set of pages.
                rootNode.Rotate = 90

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

                ' Create a first page.
                Dim 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))
            End Using

            document.Save("Page Tree.pdf")
        End Using
    End Sub
End Module

See also


Next steps

GemBox.Pdf is a .NET component that enables developers to read, merge and split PDF files or execute low-level object manipulations from .NET applications in a simple and efficient way.

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