ArcGIS Pro Layer Symbology in TOC for In Memory Feature Class

DaveLewis73

I am currently having difficulty with getting symbology to show in the Pro table of contents for a polygon layer that I have added to the map programmatically (in C#).  When I attempt to click the drop-down button to see the symbology for the layer, which is a transparent blue outline for the polygons, I am unable to see anything in the table of contents.  I also click on the Symbology option for the layer in order to bring up the Symbology dock pane and the symbol is not there either.  There is, however, an error that displays at the top of the Symbology dock pane.  There is clearly something wrong with this layer.  The strange thing is that I have other layers that I create programmatically that do display their symbology without any problems.  The only difference between them is that the layers that are working are written out to a file geodatabase on disk, whereas the layer that doesn't display symbology is an in-memory feature class that is not written to disk.  Is there a known issue with symbology and in-memory feature classes?  Could this be my problem?  If so, are there any workarounds, or if not is there something that I could be doing wrong in creating this layer that would cause the transparent blue outline of the polygons to not display in the table of contents or the Symbology dock pane?

NarelleChedzey

Hi, 

Thanks for the code and the error string. 

I don't see any problems with your feature class creation code nor the way you are constructing the renderer for the layer.  But I do have concerns about the CreateCurrentImageryFootprintLayerDefinition method and how / where you are using the return CIMFeatureLayer value. - if at all. 

Just to confirm that you are creating the layer using the LayerFactory CreateLayer method  (https://pro.arcgis.com/en/pro-app/latest/sdk/api-reference/topic76685.html)

Here's an example of adding a feature class to a map

 // get the fc
 var fc = geodatabase.OpenDataset<FeatureClass>(name);

 CIMRGBColor fillColor = new() { R = 0, G = 0, B = 255, Alpha = 0 };
 CIMRGBColor outlineColor = new() { R = 0, G = 0, B = 255 };
 CIMSolidStroke solidStroke = new() { Color = outlineColor, Width = 1.5 };

 var polySymbol = ArcGIS.Desktop.Mapping.SymbolFactory.Instance.ConstructPolygonSymbol(fillColor, SimpleFillStyle.Null, solidStroke);
 var rd = new ArcGIS.Desktop.Mapping.SimpleRendererDefinition()
 {
   Label ="Imagery footprints",
   SymbolTemplate = polySymbol.MakeSymbolReference()
 };


 var fLayerParams = new ArcGIS.Desktop.Mapping.FeatureLayerCreationParams(fc)
 {
   Name = "Current Imagery Footprints",
   RendererDefinition = rd,
 };

 var fLayer = ArcGIS.Desktop.Mapping.LayerFactory.Instance.CreateLayer<ArcGIS.Desktop.Mapping.FeatureLayer>(fLayerParams, ArcGIS.Desktop.Mapping.MapView.Active.Map);

 

We don't have every property available to set on the FeatureLayerCreationParams so if you need to update additional properties after the layer has been added then add the following 

          // update the rest of the layer properties as necessary
          var fLayerDef = fLayer.GetDefinition() as CIMFeatureLayer;
         //  fLayerDef.ShowLegends = false;    // this causes the warning
          fLayerDef.Selectable = false;
          fLayerDef.Description = "Current Custom Imagery Footprints";
          fLayerDef.CustomProperties = new CIMStringMap[] { new() { Key = "IsCustomLayer", Value = "True" } };
          fLayer.SetDefinition(fLayerDef);

 

In your particular case it appears that the ShowLegends is the property that is causing the Symbology Pane to display the warning.  I believe that this should be true.    If you wish to hide the symbol in the TOC then the best way to do that is to use the layer SetExpanded  method  (https://pro.arcgis.com/en/pro-app/latest/sdk/api-reference/topic11772.html)

Let me know if you have any additional questions.

Narelle