ArcGIS Pro 3.2 API Reference Guide
ArcGIS.Core.Data.Topology Namespace / TopologyEdge Class / GetToNode Method
Example

In This Topic
    GetToNode Method
    In This Topic
    Gets the topology node at the to point of this edge. This method must be called on the MCT. Use QueuedTask.Run.
    Syntax
    public TopologyNode GetToNode()
    Public Function GetToNode() As TopologyNode

    Return Value

    The topology node at the to point of this edge.
    Exceptions
    ExceptionDescription
    A geodatabase-related exception has occurred.
    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.");
      }
    }
    
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also