public static byte[] ExportModelToPdfByte(Matrix4D transform, DxfModel model, PaperSize paperSize, List<DxfLayout> layout = null, double scale = 1) { var graphicsConfig = (GraphicsConfig)GraphicsConfig.WhiteBackgroundCorrectForBackColor.Clone(); graphicsConfig.TryDrawingTextAsText = true; // Apparently all lines have line weight 0, so they were invisible. // With this setting the line weight is ignored. graphicsConfig.DisplayLineWeight = true; graphicsConfig.DefaultLineWeight = 0; using (var ms = new MemoryStream()) { //create the pdf container with the empty stream var pdf = new PdfExporter(ms) { ExportLayers = true, EmbedFonts = true }; //draw the model into the pdf containers stream if (layout == null && model.Layouts.Count > 2) pdf.DrawPage(model, graphicsConfig, transform, scale, model.Layouts[2], model.Layouts[2].Viewports, paperSize); else if (layout != null) { foreach (var dxfLayout in layout) { pdf.DrawPage(model, graphicsConfig, transform, scale, dxfLayout, dxfLayout.Viewports, paperSize); } } else { graphicsConfig.DisplayLineWeight = false; pdf.DrawPage(model, graphicsConfig, transform, paperSize); } //create the pdf pdf.EndDocument(); byte[] buffer = ms.ToArray(); return buffer; } }