For HTML2PDF and XML2PDF solution check our PDFDoc Scout ActiveX library instead

using System;
using System.Collections.Generic;
using System.Text;
using Bytescout.PDF;

namespace ColorizedOutlines
{
class Program
{
static void Main(string[] args)
{
PDFDocEngine engine =
new PDFDocEngine("", "");

// Add new document
Document document = engine.AddDocument();

// Add standard font
uint font = document.AddFontStandard(StandardFontType.Courier, FontEncodingType.Standard);

// Append new pages to the document
Page page = document.AddPage(PageSizeType.A4, PageOrientationType.LandScape);
Page page2 = document.AddPage(PageSizeType.A4, PageOrientationType.LandScape);

// Create new drawing
Drawing drawing = page.AddDrawing();

// Set Active Font
drawing.SetActiveFont(font, 50, false, false);

// Draw Text
drawing.PlaceText(100, 100, 0, "Hello World!");

// Close drawing
drawing.Close();

// Create new drawing
drawing = page2.AddDrawing();

// Set Active Font
drawing.SetActiveFont(font, 50, false, false);

// Draw Text
drawing.PlaceText(100, 100, 0, "Hello again, World!");

// Close drawing
drawing.Close();

// Add root outline
Outline root = document.Outlines.AddChild();
root.Title = "Root";

// Add link to page 1
Outline child = root.AddChild();
child.Title = "Page 1";
child.destination = new Destination(document, "Page1", false);
child.Color = Drawing.ToRGB(0, 0, 1); // blue color (components are 0..1 value)

// Add link to page 2
child = root.AddChild();
child.Title = "Page 2";
child.Color = Drawing.ToRGB(0, 1, 0); // red color (components are 0..1 value)
child.destination = new Destination(document, "Page2", false);

// Add NamedDestinations to document
document.AddNamedDestination("Page1", Destination.FitPage(0));
document.AddNamedDestination("Page2", Destination.FitPage(1));

// Save document
document.Save("HelloWorld.pdf");
}
}
}

Download example source code: bytescoutpdf_outlines_bookmarks_with_colors.zip (5 KB)

For HTML2PDF and XML2PDF solution check our PDFDoc Scout ActiveX library instead