public LayerCreationParams( 
   CIMDataConnection dataConnection
)

{
    // Create a connection to the WMS server
    var serverConnection = new CIMInternetServerConnection { URL = "URL of the WMS service" };
    var connection = new CIMWMSServiceConnection { ServerConnection = serverConnection };

    // Add a new layer to the map
    var layerParams = new LayerCreationParams(connection);
    //Note: Needs QueuedTask to run
    var layerCreated = LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParams, MapView.Active.Map);
}

{
    CIMStandardDataConnection cIMStandardDataConnection = new CIMStandardDataConnection()
    {
        WorkspaceConnectionString = @"SWAPXY=TRUE;SWAPXYFILTER=FALSE;URL=http://sampleserver6.arcgisonline.com/arcgis/services/SampleWorldCities/MapServer/WFSServer;VERSION=2.0.0",
        WorkspaceFactory = WorkspaceFactory.WFS,
        Dataset = "Continent",
        DatasetType = esriDatasetType.esriDTFeatureClass
    };

    // Add a new layer to the map
    var layerPamsDC = new LayerCreationParams(cIMStandardDataConnection);
    //Note: Needs QueuedTask to run
    Layer layerCreated = LayerFactory.Instance.CreateLayer<FeatureLayer>(layerPamsDC, MapView.Active.Map);
}

{
    // Create a connection to the WMS server
    var serverConnection = new CIMProjectServerConnection
    {
        URL = "URL of the WMTS service.xml",
        ServerType = ServerType.WMTS,
    };
    var service_connection = new CIMWMTSServiceConnection
    {
        ServerConnection = serverConnection,
        LayerName = "AdminBoundaries", // Specify the layer name you want to add
    };

    // Add a new layer to the map
    var layerParams = new LayerCreationParams(service_connection);
    layerParams.MapMemberPosition = MapMemberPosition.AddToBottom;
    //Note: Needs QueuedTask to run
    var layerCreated = LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParams, map);
}

{
    //This workflow would work for 
    var agsFilePath = @"C:\Data\ServerConnectionFiles\AcmeSampleService.ags";

    //ServerConnectionProjectItem supports .ags, .wms, .wmts, .wfs, and .wcs files
    var server_conn_item = ItemFactory.Instance.Create(agsFilePath)
      as ArcGIS.Desktop.Catalog.ServerConnectionProjectItem;

    //Get the server connection - passwords are never returned
    var serverConnection = server_conn_item.ServerConnection as CIMProjectServerConnection;

    //Add to an AGS service connection
    var service_connection = new CIMAGSServiceConnection()
    {
        URL = "URL to the AGS _service_ on the AGS _server_",
        ServerConnection = serverConnection
    };

    // Add a new layer to the map
    var layerParams = new LayerCreationParams(service_connection);
    layerParams.MapMemberPosition = MapMemberPosition.AddToBottom;
    //Note: Needs QueuedTask to run
    var layerCreated = LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParams, map);
}

{
    Geodatabase geodatabase = new Geodatabase(new DatabaseConnectionFile(new Uri(@"C:\Connections\mySDE.sde")));
    CIMSqlQueryDataConnection sqldc = new CIMSqlQueryDataConnection()
    {
        WorkspaceConnectionString = geodatabase.GetConnectionString(),
        GeometryType = esriGeometryType.esriGeometryPolygon,
        OIDFields = "OBJECTID",
        Srid = "102008",
        SqlQuery = "select * from MySDE.dbo.STATES",
        Dataset = "States"
    };
    var lcp = new LayerCreationParams(sqldc)
    {
        Name = "States"
    };
    //Note: Needs QueuedTask to run
    FeatureLayer flyr = LayerFactory.Instance.CreateLayer<FeatureLayer>(lcp, map);
}

{
  // Note: call within QueuedTask.Run()
  {
    //Create with initial visibility set to false. Add to current scene
    var createparams = new LayerCreationParams(new Uri(sceneLayerUrl, UriKind.Absolute))
    {
      IsVisible = false
    };

    //cast to specific type of scene layer being created - in this case FeatureSceneLayer
    var sceneLayer = LayerFactory.Instance.CreateLayer<Layer>(
             createparams, MapView.Active.Map) as FeatureSceneLayer;
    //or...specify the cast directly
    var sceneLayer2 = LayerFactory.Instance.CreateLayer<FeatureSceneLayer>(
             createparams, MapView.Active.Map);
    //ditto for BuildingSceneLayer, PointCloudSceneLayer, IntegratedMeshSceneLayer
    //...
  }
}