ArcGIS Pro根据线层所有数据生成外接多边形

  private Task<bool> ConstructSamplePolygon(FeatureLayer polygonLayer, FeatureLayer lineLayer)
        {

            // execute the fine grained API calls on the CIM main thread
            return QueuedTask.Run(() =>
            {
                // get the underlying feature class for each layer
                var polygonFeatureClass = polygonLayer.GetTable() as FeatureClass;
                var polygonDefinition = polygonFeatureClass.GetDefinition() as FeatureClassDefinition;
                var lineFeatureClass = lineLayer.GetTable() as FeatureClass;

                // construct a cursor to retrieve the line features
                var lineCursor = lineFeatureClass.Search(null, false);

                // set up the edit operation for the feature creation
                var createOperation = new EditOperation()
                {
                    Name = "Create polygons",
                    SelectNewFeatures = false
                };

                PolylineBuilder polylineBuilder = new PolylineBuilder(polygonDefinition.GetSpatialReference());

                while (lineCursor.MoveNext())
                {
                    // retrieve the first feature
                    using (var lineFeature = lineCursor.Current as Feature)
                    {
                        // add the coordinate collection of the current geometry into our overall list of collections
                        var polylineGeometry = lineFeature.GetShape() as Polyline;
                        polylineBuilder.AddParts(polylineGeometry.Parts);
                    }
                }

                // use the ConvexHull method from the GeometryEngine to construct the polygon geometry
                var newPolygon = GeometryEngine.Instance.ConvexHull(polylineBuilder.ToGeometry()) as Polygon;

                // queue the polygon creation
                createOperation.Create(polygonLayer, newPolygon);

                // execute the edit (polygon create) operation
                return createOperation.ExecuteAsync();
            });
        }

        protected async override void OnClick()
        {
            // to work in the context of the active display retrieve the current map 
            Map activeMap = MapView.Active.Map;

            // retrieve the first line layer in the map
            var lineFeatureLayer = activeMap.GetLayersAsFlattenedList().OfType<FeatureLayer>().Where(
                lyr => lyr.ShapeType == ArcGIS.Core.CIM.esriGeometryType.esriGeometryPolyline).FirstOrDefault();

            if (lineFeatureLayer == null)
                return;

            // retrieve the first polygon feature layer in the map
            var polygonFeatureLayer = activeMap.GetLayersAsFlattenedList().OfType<FeatureLayer>().Where(
                lyr => lyr.ShapeType == ArcGIS.Core.CIM.esriGeometryType.esriGeometryPolygon).FirstOrDefault();

            if (polygonFeatureLayer == null)
                return;

            //construct the polyline based of the convex hull of all polylines
            await ConstructSamplePolygon(polygonFeatureLayer, lineFeatureLayer);


        }