PDFsharp & MigraDoc Foundation

using PdfSharp;
using PdfSharp.Drawing;
using PdfSharp.Drawing.Layout;
using PdfSharp.Fonts;
using PdfSharp.Pdf;
using PdfSharp.Pdf.Annotations;
using PdfSharp.Snippets.Font;

namespace PdfSharp6Attachments
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create a new PDF document
            PdfDocument document = new PdfDocument();
            document.Info.Title = "Created with PDFsharp";

            // Create an empty page
            PdfPage page = document.AddPage();

            // Get an XGraphics object for drawing
            XGraphics gfx = XGraphics.FromPdfPage(page);

            // Create a font
            if (Capabilities.Build.IsCoreBuild)
                GlobalFontSettings.FontResolver = new FailsafeFontResolver();

            // Create a font.
            var font = new XFont("Arial", 20, XFontStyleEx.BoldItalic);

            // Draw the text
            gfx.DrawString("Hello, World!", font, XBrushes.Black,
              new XRect(0, 0, page.Width, page.Height),
              XStringFormats.Center);

            #region attach files
            AttachFile(document, "C:\\Users\\userxxx\\Downloads\\signed\\2729862.pdf", gfx, font);
            #endregion

            // Save the document...
            const string filename = "HelloWorld.pdf";
            document.Save(filename);
            // ...and start a viewer.
            //Process.Start(filename);
        }

        static void AttachFile(PdfDocument pdfDocument, string path, XGraphics gfx, XFont font)
        {
            string fileName = Path.GetFileName(path);

            pdfDocument.AddEmbeddedFile(fileName, File.OpenRead(path));

            // draw rectangle
            var annotationSystemRectangle = gfx.Transformer.WorldToDefaultPage(new XRect(new XPoint(30, 60), new XSize(300, 30)));
            XTextFormatter txtFormat = new XTextFormatter(gfx);
            gfx.DrawRectangle(XBrushes.White, annotationSystemRectangle);
            annotationSystemRectangle.X += 14;
            annotationSystemRectangle.Width -= 10;
            txtFormat.DrawString("hello attachment!",
                font,
                new XSolidBrush(XColor.FromKnownColor(XKnownColor.Black)),
                annotationSystemRectangle,
                XStringFormats.TopLeft);

            var page = pdfDocument.Pages[0];
            PdfLinkAnnotation annot = page.AddEmbeddedDocumentLink(new PdfRectangle(annotationSystemRectangle), fileName);
        }
    }
}

PdfLinkAnnotation annot = page.AddEmbeddedDocumentLink(new PdfRectangle(rectangleBottomBased), fileName);

using PdfSharp;
using PdfSharp.Drawing;
using PdfSharp.Drawing.Layout;
using PdfSharp.Fonts;
using PdfSharp.Pdf;
using PdfSharp.Pdf.Annotations;
using PdfSharp.Snippets.Font;

namespace PdfSharp6Attachments
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create a new PDF document
            PdfDocument document = new PdfDocument();
            document.Info.Title = "Created with PDFsharp";

            // Create an empty page
            PdfPage page = document.AddPage();

            // Get an XGraphics object for drawing
            XGraphics gfx = XGraphics.FromPdfPage(page);

            // Create a font
            if (Capabilities.Build.IsCoreBuild)
                GlobalFontSettings.FontResolver = new FailsafeFontResolver();

            // Create a font.
            var font = new XFont("Arial", 20, XFontStyleEx.BoldItalic);

            // Draw the text
            gfx.DrawString("Hello, World!", font, XBrushes.Black,
              new XRect(0, 0, page.Width, page.Height),
              XStringFormats.Center);

            #region attach files
            AttachFile(document, @"C:\Users\userxxx\Downloads\avion2.jpg", gfx, font);
            #endregion

            // Save the document...
            const string filename = "HelloWorld.pdf";
            document.Save(filename);
            // ...and start a viewer.
            //Process.Start(filename);
        }

        static void AttachFile(PdfDocument pdfDocument, string path, XGraphics gfx, XFont font)
        {
            var page = pdfDocument.Pages[0];

            string fileName = Path.GetFileName(path);

            pdfDocument.AddEmbeddedFile(fileName, File.OpenRead(path));

            // draw rectangle           
            var rectangleTopBased = new XRect(30, 60, 300, 300);
            XTextFormatter txtFormat = new XTextFormatter(gfx);
            gfx.DrawRectangle(XBrushes.White, rectangleTopBased);
            txtFormat.DrawString("hello attachment!",
                font,
                new XSolidBrush(XColor.FromKnownColor(XKnownColor.Black)),
                rectangleTopBased,
                XStringFormats.TopLeft);

            var rectangleBottomBased = gfx.Transformer.WorldToDefaultPage(new XRect(new XPoint(30, 60), new XSize(300, 300)));
            PdfLinkAnnotation annot = page.AddEmbeddedDocumentLink(new PdfRectangle(rectangleBottomBased), fileName);
            //page.AddWebLink(new PdfRectangle(annotationSystemRectangle), "https://www.developpez.com/");

        }
    }
}

using System;
using System.IO;
using PdfSharp.Pdf;
using PdfSharp.Pdf.Annotations;
using PdfSharp.Pdf.IO;

namespace PdfSharpLinkExample
{
    class Program
    {
        static void Main(string[] args)
        {
            string filename = "Output.pdf";

            // Create a new PDF document
            PdfDocument document = new PdfDocument();

            // Add a page to the document
            PdfPage page = document.AddPage();
            var gfx = PdfSharp.Drawing.XGraphics.FromPdfPage(page);
           
            // Create a clickable link on the page
            PdfRectangle rect = new PdfRectangle(gfx.Transformer.WorldToDefaultPage(new PdfSharp.Drawing.XRect(30, 60, 300, 30)));
            PdfLinkAnnotation link = new PdfLinkAnnotation(rect)
            {
                Contents = "Click here for the embedded document!",
                Destination = new PdfExplicitDestination(page)
            };
            page.Annotations.Add(link);

            // Save the document
            document.Save(filename);
        }
    }
}