Create PDF marked content in C# and VB.NET

Marked content refers to PDF content which is either adjacent (if Mark Type is Point) or surrounded by (if Mark Type PdfContentMark Element Start and End).

The PdfContentMark element specifies a tag that indicates the role or importance of the marked content and optionally specifies the properties of the marked content.

In the following example, you can learn how to mark geometric content, which is a visual representation of specific Unicode content.

Complete code

using System;
using System.IO;
using SautinSoft;
using SautinSoft.Pdf;
using SautinSoft.Pdf.Content;
using SautinSoft.Pdf.Content.Marked;
using SautinSoft.Pdf.Objects;

namespace Sample
{
    class Sample
    {
        /// <summary>
        /// Create PDF marked content.
        /// </summary>
        /// <remarks>
        /// Details: http://sautinsoft/products/pdf/help/net/developer-guide/marked-content.php
        /// </remarks>
        static void Main(string[] args)
        {
           
            using (var document = new PdfDocument())
            {
                var page = document.Pages.Add();

                // Surround the path with the marked content start and marked content end elements.
                var markStart = page.Content.Elements.AddMarkStart(new PdfContentMarkTag(PdfContentMarkTagRole.Span));

                var markedProperties = markStart.GetEditableProperties().GetDictionary();

                // Set replacement text for a path, as specified in http://www.adobe.com/content/dam/acom/en/devnet/pdf/PDF32000_2008.pdf#page=623
                markedProperties[PdfName.Create("ActualText")] = PdfString.Create("H");

                // Add the path that is a visual representation of the letter 'H'.
                var path = page.Content.Elements.AddPath()
                    .BeginSubpath(100, 600).LineTo(100, 800)
                    .BeginSubpath(100, 700).LineTo(200, 700)
                    .BeginSubpath(200, 600).LineTo(200, 800);

                var format = path.Format;
                format.Stroke.IsApplied = true;
                format.Stroke.Width = 10;

                page.Content.Elements.AddMarkEnd();

                document.Save("MarkedContent.pdf");
            }
        }
    }
}

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