public IReadOnlyList<Layer> CreateLayers( 
   BulkLayerCreationParams layerParams,
   ILayerContainerEdit container
)

  var uriShp = new Uri(@"c:\data\roads.shp");
  var uriSde = new Uri(@"c:\MyDataConnections\MySDE.sde\Census");
  var uri = new Uri(@"http://sampleserver6.arcgisonline.com/arcgis/rest/services/NapervilleShelters/FeatureServer/0");

  var uris = new List<Uri>() { uriShp, uriSde, uri }; ;

  // set the index and visibility
  var blkParams = new BulkLayerCreationParams(uris);
  blkParams.MapMemberPosition = MapMemberPosition.Index;
  blkParams.MapMemberIndex = 2;
  blkParams.IsVisible = false;

  var layers = LayerFactory.Instance.CreateLayers(blkParams, MapView.Active.Map);
}

string pathToGeoPackage = @"C:\Data\Geopackage\flooding.gpkg";
//Create lists to hold the URIs of the layers and tables in the geopackage
var layerUris = new List<Uri>();
var tableUris = new List<Uri>();
//Create an item from the geopackage
var item = ItemFactory.Instance.Create(pathToGeoPackage, ItemFactory.ItemType.PathItem);
var children = item.GetItems();
//Collect the table and spatial data in the geopackage
foreach (var child in children)
{
  var childPath = child.Path;

  if (child.TypeID == "sqlite_table")
    tableUris.Add(new Uri(childPath));
  else
    layerUris.Add(new Uri(childPath));
}
//Add the spatial data in the geopackage using the BulkLayerCreationParams
if (layerUris.Count > 0)
{
  BulkLayerCreationParams bulklcp = new BulkLayerCreationParams(layerUris);
  LayerFactory.Instance.CreateLayers(bulklcp, MapView.Active.Map);
}
// add the tables separately
foreach (var tableUri in tableUris)
{
  StandaloneTableFactory.Instance.CreateStandaloneTable(tableUri, MapView.Active.Map);
}