view:

 @{
            Html.ThinkGeo().Map("Map1", new System.Web.UI.WebControls.Unit(100, System.Web.UI.WebControls.UnitType.Percentage), 510)
                .MapBackground(new BackgroundLayer(new GeoSolidBrush(GeoColor.StandardColors.White)))
                .CurrentExtent(142273.397380151, 454356.07030608, 473560.82562814, 169450.546640289)
                .MapUnit(GeographyUnit.Meter)
                .StaticOverlay(overlay =>
                {
                    WmsRasterLayer wmsLayer = new WmsRasterLayer();
                    wmsLayer.Uri = new Uri("http://openbasiskaart.nl/mapcache/");
                    wmsLayer.Parameters.Add("FORMAT", "image/gif");
                    wmsLayer.Parameters.Add("SRS", "EPSG:28992");

                    wmsLayer.ActiveLayerNames.Add("osm");

                    overlay.Layer("WmsLayer", wmsLayer);
                })
                .Render();
        }

Controller:

[MapActionFilter]
        public string ToPdf(Map map, GeoCollection<object> args)
        {
            PdfDocument document = new PdfDocument();
            PdfPage page = document.AddPage();
            string selectedItemText = args[0].ToString();
            if (selectedItemText == "Landscape")
            {
                page.Orientation = PageOrientation.Landscape;
            }
            PdfGeoCanvas pdfGeoCanvas = new PdfGeoCanvas();

            // This allows you to control the area in which you want the
            // map to draw in.  Leaving this commented out uses the whole page
            //pdfGeoCanvas.DrawingArea = new Rectangle(200, 50, 400, 400);
            Collection<SimpleCandidate> labelsInLayers = new Collection<SimpleCandidate>();
            foreach (Layer layer in map.StaticOverlay.Layers)
            {
                RectangleShape printExtent = ExtentHelper.GetDrawingExtent(map.CurrentExtent, (float)map.WidthInPixels, (float)map.HeightInPixels);
                pdfGeoCanvas.BeginDrawing(page, printExtent, GeographyUnit.DecimalDegree);
                layer.Open();
                layer.Draw(pdfGeoCanvas, labelsInLayers);
                layer.Close();
                pdfGeoCanvas.EndDrawing();
            }

            string relativePath = string.Format("~/Controllers/{0}/{1}", ControllerContext.RouteData.Values["Controller"], "MapSuite PDF Map.pdf");
            string filename = Server.MapPath(relativePath);
            document.Save(filename);

            return VirtualPathUtility.ToAbsolute(relativePath);
        }