PDFsharp & MigraDoc Foundation

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using PdfSharp;
using PdfSharp.Drawing;
using PdfSharp.Pdf;
using PdfSharp.Pdf.IO;

namespace PdfSharpTest
{
    class Program
    {
        private const int MarginForPictures = 15;

        static void Main(string[] args)
        {
            var pdfDocument = PdfReader.Open(EmptyPdf(), PdfDocumentOpenMode.Modify);
            AddImage(pdfDocument);
            pdfDocument.Save("D://result.pdf");
        }

        private static Stream EmptyPdf()
        {
            return System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("PdfSharpTest.empty.pdf");
        }

        private static Stream TestImage()
        {
            return System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("PdfSharpTest.resolver.jpeg");
        }

        private static void AddImage(PdfDocument pdfDocument)
        {
            using (var image = Image.FromStream(TestImage()))
            {
                var addPage = pdfDocument.AddPage();
                addPage.Size = PageSize.Letter;
                addPage.TrimMargins = new TrimMargins { All = MarginForPictures };
                var gfx = XGraphics.FromPdfPage(addPage);
                var pdfImage = XImage.FromGdiPlusImage(image);

                var margin = XUnit.FromMillimeter(MarginForPictures).Point;
                var widthFitRate = pdfImage.PointWidth / (addPage.Width.Point - (margin * 2));
                var heightFitRate = pdfImage.PointHeight / (addPage.Height.Point - (margin * 2));

                var fitRate = Math.Max(widthFitRate, heightFitRate);

                    var fitWidth = pdfImage.PointWidth / fitRate;
                    var fitHeight = pdfImage.PointHeight / fitRate;
                    gfx.DrawImage(pdfImage, margin, margin, fitWidth, fitHeight);
               
            }
        }
    }
}