public class SliceDefinition 

{
  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()
  {
    //Use the SelectedVariableProfile to get the slices currently in the TOC
    //via its associated volume
    var volume = voxelLayer.SelectedVariableProfile.Volume;
    var slices = volume.GetSlices();

    //Do something... e.g. make them visible
    foreach (var slice in slices)
    {
      slice.IsVisible = true;
      volume.UpdateSlice(slice);
    }

    //expand the slice container and make sure container visibility is true
    voxelLayer.SetSliceContainerExpanded(true);
    voxelLayer.SetSliceContainerVisibility(true);
  }
}

{
  //Use the SelectedVariableProfile to get the slices currently in the TOC
  //via its associated volume
  var volume = voxelLayer.SelectedVariableProfile.Volume;
  var slice = volume.GetSlices().FirstOrDefault();
  var slice2 = volume.GetSlices().First(s => s.Id == my_slice_id);
}

{
  // 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
    }
  }
}