ArcGISPortalViewer.ViewModel.MapViewModel.GetOperationalLayers C# (CSharp) Method

        private IEnumerable<Esri.ArcGISRuntime.Layers.Layer> GetOperationalLayers()
        {
            if (WebMapVM != null)
            {
                foreach (var layer in WebMapVM.OperationalLayers)
                {
                    var id = !string.IsNullOrEmpty(layer.Id) ? layer.Id : layer.ItemId;
                    var opLayer = WebMapVM.Map.Layers.FirstOrDefault(l => l.ID == id);
                    if (opLayer != null)
                        yield return opLayer;
                }
            }
        }