OnDoc/ZZPDFTest/Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;
using Syncfusion.Pdf.Interactive;
using Syncfusion.Pdf.Parsing;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace ZZPDFTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            string lickey = "MzYzODg2NkAzMjM4MmUzMDJlMzBTOWljRmxNelA1d1VGOHpGR0lxQzB6UTAwKzIxK2VBNEhBZFp5alcxb1NVPQ==";
            Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense(lickey);

            PdfLoadedDocument document = new PdfLoadedDocument(@"H:\tssettings\edoka\drv.pdf");
            add_Logo(ref document, false,false);
            replace_Text(ref document, "Bausteine", "");
            //replace_Text(ref document, "Herr", Environment.NewLine+Environment.NewLine+ "Herr");
            //replace_Text(ref document, "Christoph Nõgeli", "Christoph Nõgeli");

            if (document.Pages.Count % 2 == 0)
            {
            }
            else
            {
                add_emptypage(ref document);
            }


            document.Save(@"x:\output.pdf");

            //PdfBitmap image = new PdfBitmap(@"E:\Software-Projekte\OnDoc\Images\tkb_logo_ohne_claim_4c_c.jpg");
            //PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
            //PdfGraphics graphics = loadedPage.Graphics;
            //graphics.DrawImage(image, 80, 30);

        }

        private void replace_Text(ref PdfLoadedDocument document, string texttoreplace, string newtext)
        {
            PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
            PdfFont font = new PdfTrueTypeFont(new Font("Futura Book", 9));
            Dictionary<int, List<RectangleF>> matchedTextbounds = new Dictionary<int, List<RectangleF>>();
            document.FindText(texttoreplace, out matchedTextbounds);

            for (int i = 0; i < matchedTextbounds.Count; i++)

            {
                loadedPage = (PdfLoadedPage)document.Pages[i];
                foreach (RectangleF rectangle in matchedTextbounds[i])
                {
                    // Draws the white filled rectangle over the searched text.
                    loadedPage.Graphics.DrawRectangle(PdfBrushes.White, rectangle);

                    loadedPage.Graphics.DrawString(newtext, font, PdfBrushes.Black, rectangle.X - 2, rectangle.Y - 2);

                }

            }
        }

        private void add_Logo(ref PdfLoadedDocument document, bool color, bool onlyfirstpage)
        {
            string imagefile ="";
            if (color) { imagefile = @"E:\Software-Projekte\OnDoc\Images\tkb_logo_ohne_claim_4c_c.jpg"; }
            if (!color) { imagefile = @"E:\Software-Projekte\OnDoc\Images\tkb_logo_ohne_claim_sw.jpg"; }
            PdfBitmap image = new PdfBitmap(imagefile);

            int pages = document.Pages.Count;
            if (onlyfirstpage) { pages = 1; }
            int i = 0;
            while (i < pages)
            {
                PdfLoadedPage loadedPage = document.Pages[i] as PdfLoadedPage;
                PdfGraphics graphics = loadedPage.Graphics;
                graphics.DrawImage(image, 85, 30);
                i++;
            }


        }
        private void add_emptypage(ref PdfLoadedDocument document)
        {
            document.Pages.Add();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string lickey = "MzYzODg2NkAzMjM4MmUzMDJlMzBTOWljRmxNelA1d1VGOHpGR0lxQzB6UTAwKzIxK2VBNEhBZFp5alcxb1NVPQ==";
            Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense(lickey);

            PdfLoadedDocument document = new PdfLoadedDocument(@"H:\tssettings\edoka\drv.pdf");
            //add_Logo(ref document, false, false);
            SplitDoc(ref document, "Freundliche Grüsse", "");
        }

        private void SplitDoc(ref PdfLoadedDocument document, string texttoreplace, string newtext)
        {
            PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
            PdfFont font = new PdfTrueTypeFont(new Font("Futura Book", 9));
            TextSearchOptions to = new TextSearchOptions();
            Dictionary<int, List<RectangleF>> matchedTextbounds = new Dictionary<int, List<RectangleF>>();
            document.FindText(texttoreplace, out matchedTextbounds);
            PdfDocument newdoc = new PdfDocument();
            PdfDocument newdoc2 = new PdfDocument();
            PdfDocument newdoc3 = new PdfDocument();
            foreach (int index in matchedTextbounds.Keys)
            {
                if (matchedTextbounds[index].Count > 0)
                {
                    newdoc.ImportPage(document, index);
                    newdoc2.ImportPageRange(document, index + 1, document.Pages.Count - (index + 1));
                    newdoc3 = newdoc2;
                }
            }
           

            newdoc.Save(@"x:\output1.pdf");
            newdoc2.Save(@"x:\outupt2.pdf");
            newdoc3.Save(@"x:\outupt3.pdf");



            PdfLoadedDocument doc = new PdfLoadedDocument (@"x:\output1.pdf");
            add_Logo(ref doc, true, true);
            if (doc.Pages.Count % 2 == 0)
            {
            }
            else
            {
                add_emptypage(ref doc);
            }
            doc.Save(@"x:\output1.pdf");
            doc = new PdfLoadedDocument(@"x:\outupt3.pdf");
            replace_Text(ref doc, "Exemplar für den Kunden", " Exemplar für die Bank");
            doc.Save(@"x:\outupt3.pdf");
            document.Close(true);
            newdoc.Close(true);
            
        }
    }
}