public FeatureLayerCreationParams( 
   Uri uri
)

{
    var flyrCreatnParam = new FeatureLayerCreationParams(new Uri(@"c:\data\world.gdb\cities"))
    {
        Name = "World Cities",
        IsVisible = false,
        MinimumScale = 1000000,
        MaximumScale = 5000,
        DefinitionQuery = new DefinitionQuery(whereClause: "Population > 100000", name: "More than 100k"),
        RendererDefinition = new SimpleRendererDefinition()
        {
            SymbolTemplate = SymbolFactory.Instance.ConstructPointSymbol(
       CIMColor.CreateRGBColor(255, 0, 0), 8, SimpleMarkerStyle.Hexagon).MakeSymbolReference()
        }
    };
    //Note: Needs QueuedTask to run
    var featureLayerWithParams = LayerFactory.Instance.CreateLayer<FeatureLayer>(flyrCreatnParam, map);
}

{
    //The catalog path of the feature layer to add to the map
    var featureClassUriVisibility = new Uri(@"C:\Data\Admin\AdminData.gdb\USA\cities");
    //Define the Feature Layer's parameters.
    var layerParamsVisibility = new FeatureLayerCreationParams(featureClassUriVisibility)
    {
        //Set visibility
        IsVisible = false,
    };
    //Create the layer with the feature layer parameters and add it to the active map
    //Note: Needs QueuedTask to run
    var createdFC = LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParamsVisibility, MapView.Active.Map);
}

{
    //Define a simple renderer to draw the Point US Cities feature class.
    var simpleRender = new SimpleRendererDefinition
    {
        SymbolTemplate = SymbolFactory.Instance.ConstructPointSymbol(ColorFactory.Instance.RedRGB, 4.0, SimpleMarkerStyle.Circle).MakeSymbolReference()

    };
    //The catalog path of the feature layer to add to the map
    var featureClassUri = new Uri(@"C:\Data\Admin\AdminData.gdb\USA\cities");
    //Define the Feature Layer's parameters.
    var layerParams = new FeatureLayerCreationParams(featureClassUri)
    {
        //Set visibility
        IsVisible = true,
        //Set Renderer
        RendererDefinition = simpleRender,
    };
    //Create the layer with the feature layer parameters and add it to the active map
    //Note: Needs QueuedTask to run
    var createdFCWithRenderer = LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParams, MapView.Active.Map);
}

{
    //The catalog path of the feature layer to add to the map
    var featureClassUriDefinition = new Uri(@"C:\Data\Admin\AdminData.gdb\USA\cities");
    //Define the Feature Layer's parameters.
    var layerParamsQueryDefn = new FeatureLayerCreationParams(featureClassUriDefinition)
    {
        IsVisible = true,
        DefinitionQuery = new DefinitionQuery(whereClause: "STATE_NAME = 'California'", name: "CACities")
    };
    //Note: Needs QueuedTask to run
    //Create the layer with the feature layer parameters and add it to the active map
    var createdFCWithQueryDefn = LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParamsQueryDefn, MapView.Active.Map);
}

{
  // Note: call within QueuedTask.Run()
  {
    var url = "https://geoeventsample1.esri.com:6443/arcgis/rest/services/AirportTraffics/StreamServer";
    var createParam = new FeatureLayerCreationParams(new Uri(url))
    {
      IsVisible = false //turned off by default
    };
    streamLayer = LayerFactory.Instance.CreateLayer<StreamLayer>(createParam, map);

    //or use "original" create layer (will be visible by default)
    Uri uri = new Uri(url);
    streamLayer = LayerFactory.Instance.CreateLayer(uri, map) as StreamLayer;
    streamLayer.SetVisibility(false);//turn off
  }
}