public sealed class TopologyEdge : TopologyElement, System.IDisposable, System.IEquatable<TopologyEdge>, System.IEquatable<TopologyElement>  

// Builds the map topology graph for the active map view and displays the number of topology nodes and edges.
await QueuedTask.Run(() =>
{
  //Build the map topology graph
  MapView.Active.BuildMapTopologyGraph<TopologyDefinition>(topologyGraph =>
  {
    //Getting the nodes and edges present in the graph
    var topologyGraphNodes = topologyGraph.GetNodes();
    var topologyGraphEdges = topologyGraph.GetEdges();

    foreach (var node in topologyGraphNodes)
    {
      // do something with the node
    }
    foreach (var edge in topologyGraphEdges)
    {
      // do something with the edge
    }
    MessageBox.Show($"Number of topo graph nodes are:  {topologyGraphNodes.Count}.\n Number of topo graph edges are {topologyGraphEdges.Count}.", "Map Topology Info");
  });
});