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Merge, Copy, Delete, and Rearrange PDF Pages in C# (Xamarin)

Sample C# (Xamarin) code for using PDFTron SDK to copy pages from one document to another, delete and rearrange pages, and use ImportPages() method for very efficient copy and merge operations. Learn more about our PDF Editing & Manipulation Library.

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Step 2: Add the code:

//
// Copyright (c) 2001-2018 by PDFTron Systems Inc. All Rights Reserved.
//

using System;
using System.IO;
using System.Collections;
using pdftron;
using pdftron.Common;
using pdftron.Filters;
using pdftron.SDF;
using pdftron.PDF;

using NUnit.Framework;

namespace MiscellaneousSamples
{
	/// <summary>
	/// Summary description for Class1.
	/// </summary>
	[TestFixture]
	public class PDFPageTest
	{
		
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[Test]
		public static void Sample()
		{

			// Relative path to the folder containing test files.
			const string input_path =  "TestFiles/";
			
			// Sample 1 - Split a PDF document into multiple pages
			try
			{
				Console.WriteLine("_______________________________________________");
				Console.WriteLine("Sample 1 - Split a PDF document into multiple pages...");
				Console.WriteLine("Opening the input pdf...");

				using (PDFDoc in_doc = new PDFDoc(Utils.GetAssetStream(input_path + "newsletter.pdf")))
				{
					in_doc.InitSecurityHandler();

					int page_num = in_doc.GetPageCount();
					for (int i = 1; i <= page_num; ++i) 
					{
						using (PDFDoc new_doc = new PDFDoc()) 
						{
							new_doc.InsertPages(0, in_doc, i, i, PDFDoc.InsertFlag.e_none);
							new_doc.Save(Utils.CreateExternalFile("newsletter_split_page_") + i + ".pdf", SDFDoc.SaveOptions.e_remove_unused);
							Console.WriteLine("Done. Result saved in newsletter_split_page_" + i + ".pdf");
						}
					}
				}
			}
			catch (Exception e)
			{
				Console.WriteLine("Exception caught:\n{0}", e);
			}

			// Sample 2 - Merge several PDF documents into one
			try
			{
				Console.WriteLine("_______________________________________________");
				Console.WriteLine("Sample 2 - Merge several PDF documents into one...");

				using (PDFDoc new_doc = new PDFDoc()) 
				{
					new_doc.InitSecurityHandler();
					int page_num = 15;
					for (int i = 1; i <= page_num; ++i) 
					{
						Console.WriteLine("Opening newsletter_split_page_" + i + ".pdf");
						using (PDFDoc in_doc = new PDFDoc(Utils.CreateExternalFile("newsletter_split_page_") + i + ".pdf")) 
						{
							new_doc.InsertPages(i, in_doc, 1, in_doc.GetPageCount(), PDFDoc.InsertFlag.e_none);
						}
					}
					new_doc.Save(Utils.CreateExternalFile("newsletter_merge_pages.pdf"), SDFDoc.SaveOptions.e_remove_unused);
				}
				Console.WriteLine("Done. Result saved in newsletter_merge_pages.pdf");
			}
			catch (Exception e)
			{
				Console.WriteLine("Exception caught:\n{0}", e);
			}


			// Sample 3 - Delete every second page
			try	
			{
				Console.WriteLine("_______________________________________________");
				Console.WriteLine("Sample 3 - Delete every second page...");
				Console.WriteLine("Opening the input pdf...");

				using (PDFDoc in_doc = new PDFDoc(Utils.GetAssetStream(input_path + "newsletter.pdf")))
				{
					in_doc.InitSecurityHandler();

					int page_num = in_doc.GetPageCount();
					PageIterator itr;
					while (page_num>=1)
					{
						itr = in_doc.GetPageIterator(page_num);
						in_doc.PageRemove(itr);
						page_num -= 2;
					}		

					in_doc.Save(Utils.CreateExternalFile("newsletter_page_remove.pdf"), 0);
				}
				Console.WriteLine("Done. Result saved in newsletter_page_remove.pdf...");
			}
			catch(Exception e)
			{
				Console.WriteLine("Exception caught:\n{0}", e);
			}

			// Sample 4 - Inserts a page from one document at different
			// locations within another document                       
			try   
			{	 
				Console.WriteLine("_______________________________________________");
				Console.WriteLine("Sample 4 - Insert a page at different locations...");
				Console.WriteLine("Opening the input pdf...");

				using (PDFDoc in1_doc = new PDFDoc(Utils.GetAssetStream(input_path + "newsletter.pdf")))
				using (PDFDoc in2_doc = new PDFDoc(Utils.GetAssetStream(input_path + "fish.pdf")))
				{
					in1_doc.InitSecurityHandler();
					in2_doc.InitSecurityHandler();

					Page src_page = in2_doc.GetPage(1);
					PageIterator dst_page = in1_doc.GetPageIterator(1);
					int page_num = 1;
					while (dst_page.HasNext()) {
						if (page_num++ % 3 == 0) {
							in1_doc.PageInsert(dst_page, src_page);
						}
						dst_page.Next();
					}

					in1_doc.Save(Utils.CreateExternalFile("newsletter_page_insert.pdf"), 0);
					Console.WriteLine("Done. Result saved in newsletter_page_insert.pdf...");
				}
			}
			catch(Exception e)
			{
				Console.WriteLine("Exception caught:\n{0}", e);
			}

			// Sample 5 - Replicate pages within a single document
			try	
			{
				Console.WriteLine("_______________________________________________");
				Console.WriteLine("Sample 5 - Replicate pages within a single document...");
				Console.WriteLine("Opening the input pdf...");
				using (PDFDoc doc = new PDFDoc(Utils.GetAssetStream(input_path + "newsletter.pdf"))) 
				{
					doc.InitSecurityHandler();

					// Replicate the cover page three times (copy page #1 and place it before the 
					// seventh page in the document page sequence)
					Page cover = doc.GetPage(1);
                    PageIterator p7 = doc.GetPageIterator(7);
                    doc.PageInsert(p7, cover);
					doc.PageInsert(p7, cover);
					doc.PageInsert(p7, cover);

					// Replicate the cover page two more times by placing it before and after
					// existing pages.
					doc.PagePushFront(cover);
					doc.PagePushBack(cover);

					doc.Save(Utils.CreateExternalFile("newsletter_page_clone.pdf"), 0);
					Console.WriteLine("Done. Result saved in newsletter_page_clone.pdf...");
				}
			}
			catch(Exception e)
			{
				Console.WriteLine("Exception caught:\n{0}", e);
			}

			// Sample 6 - Use ImportPages() in order to copy multiple pages at once    
			// in order to preserve shared resources between pages (e.g. images, fonts,
			// colorspaces, etc.)
			try	
			{    
				Console.WriteLine("_______________________________________________");
				Console.WriteLine("Sample 6 - Preserving shared resources using ImportPages...");
				Console.WriteLine("Opening the input pdf...");
				using (PDFDoc in_doc = new PDFDoc(Utils.GetAssetStream(input_path + "newsletter.pdf"))) 
				{
					in_doc.InitSecurityHandler();
					using (PDFDoc new_doc = new PDFDoc()) 
					{
						ArrayList copy_pages = new ArrayList(); 
						for (PageIterator itr = in_doc.GetPageIterator(); itr.HasNext(); itr.Next()) {
							copy_pages.Add(itr.Current());
						}

						ArrayList imported_pages = new_doc.ImportPages(copy_pages);
						for (int i=0; i!=imported_pages.Count; ++i) {
							new_doc.PagePushFront((Page)imported_pages[i]); // Order pages in reverse order. 
							// Use PagePushBack() if you would like to preserve the same order.
						}
					
						new_doc.Save(Utils.CreateExternalFile("newsletter_import_pages.pdf"), 0);
						Console.WriteLine("Done. Result saved in newsletter_import_pages.pdf...");
						Console.WriteLine();
						Console.WriteLine("Note that the output file size is less than half the size"); 
						Console.WriteLine("of the file produced using individual page copy operations");
						Console.WriteLine("between two documents");
					}
				}
			}
			catch(Exception e)
			{
				Console.WriteLine("Exception caught:\n{0}", e);
			}
		}
	}
}