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);
await QueuedTask.Run(() =>
{
  var layer = 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);
await QueuedTask.Run(() =>
{
  Layer layer = 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;
var map = MapView.Active.Map;
        await QueuedTask.Run(() =>
        {
            var layer = 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;
      var map = MapView.Active.Map;
      await QueuedTask.Run(() =>
      {
          var layer = LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParams, map);
      });

await QueuedTask.Run(() =>
{
  Map map = MapView.Active.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"
  };
  FeatureLayer flyr = LayerFactory.Instance.CreateLayer<FeatureLayer>(lcp, map);
});