public Dictionary<MapMember,List<long>> ToDictionary()

// get the currently selected features in the map
var selectedFeatures = ArcGIS.Desktop.Mapping.MapView.Active.Map.GetSelection();
// get the first layer and its corresponding selected feature OIDs
var firstSelectionSet = selectedFeatures.ToDictionary().First();

// create an instance of the inspector class
var inspector = new ArcGIS.Desktop.Editing.Attributes.Inspector();
// load the selected features into the inspector using a list of object IDs
await inspector.LoadAsync(firstSelectionSet.Key, firstSelectionSet.Value);

// get the currently selected features in the map
var selectedFeatures = ArcGIS.Desktop.Mapping.MapView.Active.Map.GetSelection();
// get the first layer and its corresponding selected feature OIDs
var firstSelectionSet = selectedFeatures.ToDictionary().First();

// create an instance of the inspector class
var inspector = new ArcGIS.Desktop.Editing.Attributes.Inspector();
// load the selected features into the inspector using a list of object IDs
await inspector.LoadAsync(firstSelectionSet.Key, firstSelectionSet.Value);

QueuedTask.Run(() =>
{

  // get the currently selected features in the map
  var selectedFeatures = ArcGIS.Desktop.Mapping.MapView.Active.Map.GetSelection();

  // get the first layer and its corresponding selected feature OIDs
  var firstSelectionSet = selectedFeatures.ToDictionary().First();

  // create an instance of the inspector class
  var inspector = new ArcGIS.Desktop.Editing.Attributes.Inspector();

  // load the selected features into the inspector using a list of object IDs
  inspector.Load(firstSelectionSet.Key, firstSelectionSet.Value);

  //get the value of
  var pscode = inspector["STATE_NAME"];
  var myGeometry = inspector.Shape;
});

QueuedTask.Run(() =>
{

  // get the currently selected features in the map
  var selectedFeatures = ArcGIS.Desktop.Mapping.MapView.Active.Map.GetSelection();

  // get the first layer and its corresponding selected feature OIDs
  var firstSelectionSet = selectedFeatures.ToDictionary().First();

  // create an instance of the inspector class
  var inspector = new ArcGIS.Desktop.Editing.Attributes.Inspector();

  // load the selected features into the inspector using a list of object IDs
  inspector.Load(firstSelectionSet.Key, firstSelectionSet.Value);

  //get the value of
  var pscode = inspector["STATE_NAME"];
  var myGeometry = inspector.Shape;
});

await QueuedTask.Run(() =>
{
  MapMemberIDSet rootNodes = MapView.Active.GetRootNodes();
  var rootNodeDict = rootNodes.ToDictionary();

  // rootNodeDict is a Dictionary<MapMember, List<long>>

  // access a particular mapMember in the Dictionary
  if (rootNodeDict.ContainsKey(mapMember))
  {
    var oids = rootNodeDict[mapMember];
  }

  // OR iterate through the dictionary
  foreach (var (mm, oids) in rootNodeDict)
  {
    // do something
  }
});