Update Symbology based on .lyr file

Question

Hi, I'm trying to figure out how to update a layers symbology using an existing .lyr file. I can use the code below to add the layer file, but when I've already got the layer in my map all I really need to do is update the symbology. QueuedTask.Run(() => { Uri myUri = new Uri(@"K:\DSM Shared\ArcMap Symbology\10.2 Schema\Editing Symbols\GISWRKS1.WORKS.WAT_Hydrant.lyr"); Layer newLayer = LayerFactory.Instance.CreateFeatureLayer(myUri, MapView.Active.Map, LayerPosition.AddToTop); } );‍‍‍‍‍‍ Any guidance is appreciated. Thanks,

BrianBulla · Answer

For anyone interested, it looks like there is a reported bug about this.

BrianBulla · Answer

Hi Robert LeClair‌ So I've been trying to use the Geoprocessing.ExecuteToolAsync("ApplySymbologyFromLayer_management"....) method for applying a .lyr/.lyrx file to a layer. According to all the documentation this should work, but I cannot get it to work as a C# add-in, or using a simple Python script. Can you confirm if there are any issues with this tool and how it works?? I've spent a lot of time on this already and don't want to continue if there are known issues. See Building proper syntax for importing .lyr symbology for Feature Layer . async private void btnSymbolize_Click(object sender, RoutedEventArgs e) { try { //QueuedTask.Run(() => //{ // Uri myUri = new Uri(@"K:\DSM Shared\ArcMap Symbology\10.2 Schema\Editing Symbols\GISWRKS1.WORKS.WAT_Hydrant.lyr"); // Layer newLayer = LayerFactory.Instance.CreateFeatureLayer(myUri, MapView.Active.Map, LayerPosition.AddToTop); //} //); //var parameters = Geoprocessing.MakeValueArray("GISWRKS1.WORKS.WAT_Hydrant.lyr", @"K:\DSM Shared\ArcMap Symbology\TEST\Editing Symbols\GISWRKS1.WORKS.WAT_Hydrant.lyrx"); //var gpresult = await Geoprocessing.ExecuteToolAsync("ApplySymbologyFromLayer_management", new string[] { "GISWRKS1.WORKS.WAT_Hydrant", @"K:\DSM Shared\ArcMap Symbology\10.2 Schema\Editing Symbols\GISWRKS1.WORKS.WAT_Hydrant.lyr" }); Map map = MapView.Active.Map; pBar.Minimum = 0; pBar.Maximum = map.Layers.Count; this.Cursor = Cursors.Wait; GPExecuteToolFlags flags = GPExecuteToolFlags.GPThread; foreach (Layer layer in map.GetLayersAsFlattenedList().OfType<FeatureLayer>()) { var gpresult = await Geoprocessing.ExecuteToolAsync("ApplySymbologyFromLayer_management", new string[] { layer.Name.ToString(), @"K:\DSM Shared\ArcMap Symbology\10.2 Schema\Editing Symbols\" + layer.Name.ToString() + ".lyr" }, null, null, flags); pBar.Value = pBar.Value + 1; } } catch (Exception ex) { ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show(ex.ToString()); } finally { this.Cursor = Cursors.Arrow; this.Close(); } }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍