C#的WPF下在GMap.NET中添加导航路径

//获取导航Provider，如果当前Map的Provider不支持导航，那么调用默认OpenStreetMap
            RoutingProvider routingProvider =
       mapControl.MapProvider as RoutingProvider ?? GMapProviders.OpenStreetMap;

            MapRoute route = routingProvider.GetRoute(
                new PointLatLng(35.834914, -76.009508), //起始点
                new PointLatLng(35.854914, -76.009508), //结束点
                false, //是否高速
                false, //步行模式
                (int)mapControl.Zoom);

            GMapRoute gmRoute = new GMapRoute(route.Points);

            mapControl.Markers.Add(gmRoute);