topic Getting the Selected Feature in ArcGIS Pro SDK Questions

Getting the Selected Feature

BrianBulla — Sun, 12 Dec 2021 07:44:10 GMT

I have no idea what why i can't figure this out, but after hours of trying i am finally having to get some help. All I want to do is get the selected line feature from a FeatureLayer object so I can get the starting point (fromPoint). Here is my current version of code:

                    QueuedTask.Run(() =>
                    {
                        var gsSelection = gsFLayer.GetSelection();                        
                        using (ArcGIS.Core.Data.RowCursor rCursor = gsSelection.Search())
                        {
                            while (rCursor.MoveNext())
                            {
                                Feature gsFeature = rCursor.Current as Feature;
                                IPolyline6 gsPolyline = gsFeature as IPolyline6;
                                IPoint fromPoint = gsPolyline.FromPoint;
                            }
                        }
                        
                    });‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Earlier in my code I use this to get the layer, which appears to be working. I can get to the attributes of the selected feature without any issues.

gsFLayer = map.GetLayersAsFlattenedList().OfType<ArcGIS.Desktop.Mapping.FeatureLayer>().Where(l => l.Name.IndexOf("GISWRKS1.WORKS.GravitySewer", StringComparison.CurrentCultureIgnoreCase) >= 0).FirstOrDefault();‍

I get a NullReference exception at IPoint fromPoint = gsPolyline.FromPoint;

Any help is appreciated.

Thanks!

Re: Getting the Selected Feature

RichRuh — Thu, 25 Jun 2020 18:22:09 GMT

Brian,

The only IPolyline6 that I am aware of comes from the ArcObjects SDK. This is a Pro SDK program, right? If so, you should access the `Feature.GetShape()` method and then try casting that to an ArcGIS.Core.Geometry.Polyline feature.

--Rich

Re: Getting the Selected Feature

BrianBulla — Sun, 12 Dec 2021 07:44:13 GMT

Ah, thanks Rich for giving my brain a kick and knocking some sense into me! Turns out i was looking at a block of code from an ArcObjects project I worked on where I knew I was doing a similar thing. I had converted that project to ArcGIS Pro, but was just looking at the wrong project.

I am good now!! This seems to work for anyone interested.

                    QueuedTask.Run(() =>
                    {
                        var gsSelection = gsFLayer.GetSelection();
                        IReadOnlyList<long> selectedOIDs = gsSelection.GetObjectIDs();

                        foreach (var oid in selectedOIDs)
                        {
                            var insp = new ArcGIS.Desktop.Editing.Attributes.Inspector();
                            insp.Load(gsFLayer, oid);

                            //Get the To and From point of the currently selected feature
                            var pointCollection = ((ArcGIS.Core.Geometry.Multipart)insp.Shape).Points;
                            ArcGIS.Core.Geometry.MapPoint fromPoint = pointCollection[0];
                            ArcGIS.Core.Geometry.MapPoint toPoint = pointCollection[pointCollection.Count - 1];

                            MessageBox.Show(insp["FACILITYID"].ToString());
                        }
                    });‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Getting the Selected Feature

RichRuh — Thu, 25 Jun 2020 19:51:46 GMT

That's a relief to hear! You had me questioning my sanity for a few minutes. 🙂

--Rich