public BulkLayerCreationParams( 
   IEnumerable<LayerCreationParams> layerCreationParams
)

var uriShp = new Uri(@"c:\data\roads.shp");
var lcpShp = new FeatureLayerCreationParams(uriShp);
lcpShp.Name = "Roads";
lcpShp.IsVisible = false;
lcpShp.DefinitionQuery = new DefinitionQuery("shpQuery", "OBJECTID > 10");

var lcpItem = new FeatureLayerCreationParams(Item);
lcpItem.Name = "Census Polygons";
lcpItem.IsVisible = true;

// list contains a Uri data source and an Item data source
// LayerFactory.Instance.CreateLayers will throw an ArgumentException
var lcps = new List<FeatureLayerCreationParams>();
lcps.Add(lcpShp);
lcps.Add(lcpItem);

var blkParams = new BulkLayerCreationParams(lcps);

// LayerFactory.Instance.CreateLayers will thrown an ArgumentException
// because the LayerCreationParams are created using different 
// types of data sources (1 Uri and 1 Item)
var layers = LayerFactory.Instance.CreateLayers(blkParams, MapView.Active.Map);

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 lcpShp = new FeatureLayerCreationParams(uriShp);
lcpShp.Name = "Roads";
lcpShp.IsVisible = false;
lcpShp.DefinitionQuery = new DefinitionQuery("shpQuery", "OBJECTID > 10");

var lcpSde = new FeatureLayerCreationParams(uriSde);
lcpSde.Name = "Census Polygons";
lcpSde.IsVisible = true;

var lcpService = new FeatureLayerCreationParams(uri);
lcpService.Name = "Shelters";
lcpService.IsVisible = true;
// set some renderer here ...
//lcpService.RendererDefinition = ...

var lcps = new List<FeatureLayerCreationParams>();
lcps.Add(lcpShp);
lcps.Add(lcpSde);
lcps.Add(lcpService);

var blkParams = new BulkLayerCreationParams(lcps);
// set the positioning on the BulkLayerCreationParams
blkParams.MapMemberPosition = MapMemberPosition.Index;
blkParams.MapMemberIndex = 0;

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

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 lcpShp = new FeatureLayerCreationParams(uriShp);
lcpShp.Name = "Roads";
lcpShp.IsVisible = false;
lcpShp.DefinitionQuery = new DefinitionQuery("shpQuery", "OBJECTID > 10");

var lcpSde = new FeatureLayerCreationParams(uriSde);
lcpSde.Name = "Census Polygons";
lcpSde.IsVisible = true;

var lcpService = new FeatureLayerCreationParams(uri);
lcpService.Name = "Shelters";
lcpService.IsVisible = true;
// set some renderer here ...
//lcpService.RendererDefinition = ...

var lcps = new List<FeatureLayerCreationParams>();
lcps.Add(lcpShp);
lcps.Add(lcpSde);
lcps.Add(lcpService);

var blkParams = new BulkLayerCreationParams(lcps);
// set the positioning on the BulkLayerCreationParams
blkParams.MapMemberPosition = MapMemberPosition.Index;
blkParams.MapMemberIndex = 0;

// set the rollback behavior
// - rollback if one or more layers cannot be created due to an invalid data source
blkParams.RollbackBehavior = LayerCreationRollbackBehavior.RollbackOnMissingLayers;

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