PDF File Links

private void buttonCreatePdf_Click(object sender, EventArgs e)
{
    // create a PDF document
    PdfDocument document = new PdfDocument();

    // display the attachments when the document is opened
    document.Viewer.PageMode = PdfPageMode.Attachments;

    // create a page in document
    PdfPage page1 = document.AddPage();

    // create the true type fonts that can be used in document
    Font sysFont = new Font("Times New Roman", 10, System.Drawing.GraphicsUnit.Point);
    PdfFont pdfFont = document.CreateFont(sysFont);
    PdfFont pdfFontEmbed = document.CreateFont(sysFont, true);

    // create a reference Graphics used for measuring
    Bitmap refBmp = new Bitmap(1, 1);
    Graphics refGraphics = Graphics.FromImage(refBmp);
    refGraphics.PageUnit = GraphicsUnit.Point;

    // create an attachment with icon from file
    string filePath1 = Application.StartupPath + @"\DemoFiles\Attach\TextAttach1.txt";
    PdfAttachment pdfAttachment1 = document.CreateAttachmentFromFile(page1, new RectangleF(10, 30, 10, 20),
                PdfAttachIconType.PushPin, filePath1);
    pdfAttachment1.Description = "Attachment with icon from a file";

    // write a description at the right of the icon
    PdfText pdfAttachment1Descr = new PdfText(40, 35, pdfAttachment1.Description, pdfFontEmbed);
    page1.Layout(pdfAttachment1Descr);

    // create an attachment with icon from a stream
    // The stream must remain opened until the document is saved 
    FileStream fileStream2 = new FileStream(filePath1, FileMode.Open, FileAccess.Read);
    PdfAttachment pdfAttachment2 = document.CreateAttachmentFromStream(page1, new RectangleF(10, 60, 10, 20), PdfAttachIconType.Paperclip,
                fileStream2, "AttachFromStream_WithIcon.txt");
    pdfAttachment2.Description = "Attachment with icon from a stream";

    // write a description at the right of the icon
    PdfText pdfAttachment2Descr = new PdfText(40, 65, pdfAttachment2.Description, pdfFontEmbed);
    page1.Layout(pdfAttachment2Descr);

    // create an attachment without icon in PDF from a file
    string filePath2 = Application.StartupPath + @"\DemoFiles\Attach\TextAttach2.txt";
    document.CreateAttachmentFromFile(filePath2);

    // create an attachment without icon in PDF from a stream
    // The stream must remain opened until the document is saved 
    FileStream fileStream1 = new FileStream(filePath2, FileMode.Open, FileAccess.Read);
    document.CreateAttachmentFromStream(fileStream1, "AttachFromStream_NoIcon.txt");

    // create the external file link
    string extFilePath = @"DemoFiles\Attach\TextAttach1.txt";
    string linkText = String.Format("Click this link to open the '{0}' file from file system", extFilePath);
    PdfText clickHereText = new PdfText(10, 100, linkText, pdfFontEmbed);
    clickHereText.ForeColor = Color.Navy;
    page1.Layout(clickHereText);

    SizeF textSize = refGraphics.MeasureString(linkText, sysFont);

    document.CreateFileLink(page1, new RectangleF(10,100,textSize.Width, textSize.Height), extFilePath);

    // dispose the graphics used for measuring
    refGraphics.Dispose();
    refBmp.Dispose();

    Cursor = Cursors.WaitCursor;
    string pdfFile = Application.StartupPath + @"\DemoOutput\PdfAttachments.pdf";
    try
    {
        document.WriteToFile(pdfFile);
    }
    catch (Exception ex)
    {
        MessageBox.Show(String.Format("Cannot create the PDF document. {0}", ex.Message));
        return;
    }
    finally
    {
        document.Close();
        fileStream1.Close();
        Cursor = Cursors.Arrow;
    }

    // open the created PDF document
    try
    {
        System.Diagnostics.Process.Start(pdfFile);
    }
    catch (Exception ex)
    {
        MessageBox.Show(String.Format("The PDF document was created but cannot open '{0}'. {1}", pdfFile, ex.Message));
    }
}