public class LayerFactory : ILayerFactory  

      /*
* string url = @"c:\data\project.gdb\DEM";  //Raster dataset from a FileGeodatabase
* string url = @"c:\connections\mySDEConnection.sde\roads";  //FeatureClass of a SDE
* string url = @"c:\connections\mySDEConnection.sde\States\roads";  //FeatureClass within a FeatureDataset from a SDE
* string url = @"c:\data\roads.shp";  //Shapefile
* string url = @"c:\data\imagery.tif";  //Image from a folder
* string url = @"c:\data\mySDEConnection.sde\roads";  //.lyrx or .lpkx file
* string url = @"c:\data\CAD\Charlottesville\N1W1.dwg\Polyline";  //FeatureClass in a CAD dwg file
* string url = @"C:\data\CAD\UrbanHouse.rvt\Architectural\Windows"; //Features in a Revit file
* string url = @"http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer";  //map service
* string url = @"http://sampleserver6.arcgisonline.com/arcgis/rest/services/NapervilleShelters/FeatureServer/0";  //FeatureLayer off a map service or feature service
*/
string url = @"c:\data\project.gdb\roads";  //FeatureClass of a FileGeodatabase

Uri uri = new Uri(url);
await QueuedTask.Run(() => LayerFactory.Instance.CreateLayer(uri, MapView.Active.Map));