ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.Data.Topology Namespace / TopologyElement Class
Members Example

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    TopologyElement Class
    In This Topic
    Represents a topological element within a topology graph.
    Object Model
    TopologyElement ClassGeometry Class
    Syntax
    Example
    FindClosestElement
    public void FindClosestElement()
    {
      using (Geodatabase geodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri(@"C:\TestData\GrandTeton.gdb"))))
      using (Topology topology = geodatabase.OpenDataset<Topology>("Backcountry_Topology"))
      {
        // Build a topology graph using the extent of the topology dataset.
    
        topology.BuildGraph(topology.GetExtent(), (topologyGraph) =>
        {
          MapPoint queryPointViaCampsites12 = null;
    
          using (Feature campsites12 = GetFeature(geodatabase, "Campsites", 12))
          {
            queryPointViaCampsites12 = campsites12.GetShape() as MapPoint;
          }
    
          double searchRadius = 1.0;
    
          TopologyElement topologyElementViaCampsites12 = 
              topologyGraph.FindClosestElement<TopologyElement>(
                        queryPointViaCampsites12, searchRadius);
    
          System.Diagnostics.Debug.Assert(
            topologyElementViaCampsites12 != null, "There should be a topology element corresponding to 'queryPointViaCampsites12' within the 'searchRadius' units.");
    
          IReadOnlyList<FeatureInfo> parentFeatures = topologyElementViaCampsites12.GetParentFeatures();
    
          Console.WriteLine("The parent features that spawn 'topologyElementViaCampsites12' are:");
          foreach (FeatureInfo parentFeature in parentFeatures)
          {
            Console.WriteLine($"\t{parentFeature.FeatureClassName}; OID: {parentFeature.ObjectID}");
          }
    
          TopologyNode topologyNodeViaCampsites12 = topologyGraph.FindClosestElement<TopologyNode>(queryPointViaCampsites12, searchRadius);
    
          if (topologyNodeViaCampsites12 != null)
          {
            // There exists a TopologyNode nearest to the query point within searchRadius units.
          }
    
          TopologyEdge topologyEdgeViaCampsites12 = topologyGraph.FindClosestElement<TopologyEdge>(queryPointViaCampsites12, searchRadius);
    
          if (topologyEdgeViaCampsites12 != null)
          {
            // There exists a TopologyEdge nearest to the query point within searchRadius units.
          }
        });
      }
    }
    
    Inheritance Hierarchy

    System.Object
       ArcGIS.Core.CoreObjectsBase
          ArcGIS.Core.Data.Topology.TopologyElement
             ArcGIS.Core.Data.Topology.TopologyEdge
             ArcGIS.Core.Data.Topology.TopologyNode

    Requirements

    Target Platforms: Windows 11, Windows 10, Windows 8.1

    See Also