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

In This Topic
    FeatureInfo Class
    In This Topic

    Represents the parent feature of a topological element.

    A parent feature refers to a feature in the feature space from which one or more topological elements are created in the topology graph space.

    Object Model
    FeatureInfo ClassFeature Class
    Syntax
    public sealed class FeatureInfo 
    Public NotInheritable Class FeatureInfo 
    Example
    ExploreTopologyGraph
    public void ExploreTopologyGraph()
    {
      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) =>
        {
          using (Feature campsites12 = GetFeature(geodatabase, "Campsites", 12))
          {
            IReadOnlyList<TopologyNode> topologyNodesViaCampsites12 = topologyGraph.GetNodes(campsites12);
    
            TopologyNode topologyNodeViaCampsites12 = topologyNodesViaCampsites12[0];
    
            IReadOnlyList<TopologyEdge> allEdgesConnectedToNodeViaCampsites12 = topologyNodeViaCampsites12.GetEdges();
            IReadOnlyList<TopologyEdge> allEdgesConnectedToNodeViaCampsites12CounterClockwise = topologyNodeViaCampsites12.GetEdges(false);
    
            System.Diagnostics.Debug.Assert(allEdgesConnectedToNodeViaCampsites12.Count == allEdgesConnectedToNodeViaCampsites12CounterClockwise.Count);
    
            foreach (TopologyEdge edgeConnectedToNodeViaCampsites12 in allEdgesConnectedToNodeViaCampsites12)
            {
              TopologyNode fromNode = edgeConnectedToNodeViaCampsites12.GetFromNode();
              TopologyNode toNode = edgeConnectedToNodeViaCampsites12.GetToNode();
    
              bool fromNodeIsTheSameAsTopologyNodeViaCampsites12 = (fromNode == topologyNodeViaCampsites12);
              bool toNodeIsTheSameAsTopologyNodeViaCampsites12 = (toNode == topologyNodeViaCampsites12);
    
              System.Diagnostics.Debug.Assert(fromNodeIsTheSameAsTopologyNodeViaCampsites12 || toNodeIsTheSameAsTopologyNodeViaCampsites12,
                "The FromNode *or* ToNode of each edge connected to 'topologyNodeViaCampsites12' should be the same as 'topologyNodeViaCampsites12' itself.");
    
              IReadOnlyList<FeatureInfo> leftParentFeaturesBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetLeftParentFeatures();
              foreach (FeatureInfo featureInfo in leftParentFeaturesBoundedByEdge)
              {
                System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
                System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
                EnsureShapeIsNotEmpty(featureInfo);
              }
    
              IReadOnlyList<FeatureInfo> leftParentFeaturesNotBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetLeftParentFeatures(false);
              foreach (FeatureInfo featureInfo in leftParentFeaturesNotBoundedByEdge)
              {
                System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
                System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
                EnsureShapeIsNotEmpty(featureInfo);
              }
    
              IReadOnlyList<FeatureInfo> rightParentFeaturesBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetRightParentFeatures();
              foreach (FeatureInfo featureInfo in rightParentFeaturesBoundedByEdge)
              {
                System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
                System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
                EnsureShapeIsNotEmpty(featureInfo);
              }
    
              IReadOnlyList<FeatureInfo> rightParentFeaturesNotBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetRightParentFeatures(false);
              foreach (FeatureInfo featureInfo in rightParentFeaturesNotBoundedByEdge)
              {
                System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
                System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
                EnsureShapeIsNotEmpty(featureInfo);
              }
            }
          }
        });
      }
    }
    
    private void EnsureShapeIsNotEmpty(FeatureInfo featureInfo)
    {
      using (Feature feature = featureInfo.GetFeature())
      {
        System.Diagnostics.Debug.Assert(!feature.GetShape().IsEmpty, "The feature's shape should not be empty.");
      }
    }
    
    Inheritance Hierarchy

    System.Object
       ArcGIS.Core.Data.Topology.FeatureInfo

    Requirements

    Target Platforms: Windows 11, Windows 10, Windows 8.1

    See Also