public IReadOnlyList<SliceDefinition> GetSelectedSlices()

{
  var surfaces = MapView.Active.GetSelectedIsosurfaces();
  //set selected w/ MapView.Active.SelectVoxelIsosurface(isoSurface)
  var slices = MapView.Active.GetSelectedSlices();
  //set selected w/ MapView.Active.SelectVoxelSlice(slice)
  var sections = MapView.Active.GetSelectedSections();
  //set selected w/ MapView.Active.SelectVoxelSection(section)
  var locked_sections = MapView.Active.GetSelectedLockedSections();
  //set selected w/ MapView.Active.SelectVoxelLockedSection(locked_section)
}

{
  // Note: call within QueuedTask.Run()
  {
    var slice = MapView.Active?.GetSelectedSlices()?.FirstOrDefault();
    if (slice != null)
    {
      //Do something with the slice
    }
  }
}

{
  // Note: call within QueuedTask.Run()
  {
    voxelLayer = null;
    var slice = MapView.Active?.GetSelectedSlices()?.FirstOrDefault();
    if (slice != null)
    {
      voxelLayer = slice.Layer;
      //TODO - use the layer
    }
  }
}