public StretchColorizerDefinition()

await QueuedTask.Run(async () =>
{
  // Check if the Stretch colorizer can be applied to the raster layer.
  if (rasterLayer.GetApplicableColorizers().Contains(RasterColorizerType.StretchColorizer))
  {
    // Create a new Stretch Colorizer Definition using the default constructor.
    StretchColorizerDefinition stretchColorizerDef_default = new StretchColorizerDefinition();
    // Create a new Stretch colorizer using the colorizer definition created above.
    CIMRasterStretchColorizer newStretchColorizer_default =
await rasterLayer.CreateColorizerAsync(stretchColorizerDef_default) as CIMRasterStretchColorizer;
    // Set the new colorizer on the raster layer.
    rasterLayer.SetColorizer(newStretchColorizer_default);
  }
});

  // Create a new stretch colorizer definition using default constructor.
  StretchColorizerDefinition stretchColorizerDef = new StretchColorizerDefinition();
  var rasterLayerCreationParams = new RasterLayerCreationParams(new Uri(url))
  {
    ColorizerDefinition = stretchColorizerDef,
    Name = layerName,
    MapMemberIndex = 0
  };
  await QueuedTask.Run(() =>
  {
    // Create a raster layer using the colorizer definition created above.
    // Note: You can create a raster layer from a url, project item, or data connection.
    RasterLayer rasterLayerfromURL =
LayerFactory.Instance.CreateLayer<RasterLayer>(rasterLayerCreationParams, aMap);
  });

await QueuedTask.Run(async () =>
{
  // Get the image sub-layer from the mosaic layer.
  ImageMosaicSubLayer mosaicImageSubLayer = mosaicLayer.GetImageLayer();
  // Check if the Stretch colorizer can be applied to the image sub-layer.
  if (mosaicImageSubLayer.GetApplicableColorizers().Contains(RasterColorizerType.StretchColorizer))
  {
    // Create a new Stretch Colorizer Definition using the default constructor.
    StretchColorizerDefinition stretchColorizerDef_default = new StretchColorizerDefinition();
    // Create a new Stretch colorizer using the colorizer definition created above.
    CIMRasterStretchColorizer newStretchColorizer_default =
await mosaicImageSubLayer.CreateColorizerAsync(stretchColorizerDef_default) as CIMRasterStretchColorizer;
    // Set the new colorizer on the image sub-layer.
    mosaicImageSubLayer.SetColorizer(newStretchColorizer_default);
  }
});

  // Create a new colorizer definition using default constructor.
  StretchColorizerDefinition stretchColorizerDef = new StretchColorizerDefinition();
  var rasterLayerCreationParams = new RasterLayerCreationParams(new Uri(url))
  {
    Name = layerName,
    ColorizerDefinition = stretchColorizerDef,
    MapMemberIndex = 0

  };
  await QueuedTask.Run(() =>
  {
    // Create a mosaic layer using the colorizer definition created above.
    // Note: You can create a mosaic layer from a url, project item, or data connection.
    MosaicLayer newMosaicLayer =
LayerFactory.Instance.CreateLayer<MosaicLayer>(rasterLayerCreationParams, aMap);
  });

await QueuedTask.Run(async () =>
{
  // Check if the Stretch colorizer can be applied to the image service layer.
  if (isLayer.GetApplicableColorizers().Contains(RasterColorizerType.StretchColorizer))
  {
    // Create a new Stretch Colorizer Definition using the default constructor.
    StretchColorizerDefinition stretchColorizerDef_default = new StretchColorizerDefinition();
    // Create a new Stretch colorizer using the colorizer definition created above.
    CIMRasterStretchColorizer newStretchColorizer_default =
await isLayer.CreateColorizerAsync(stretchColorizerDef_default) as CIMRasterStretchColorizer;
    // Set the new colorizer on the image service layer.
    isLayer.SetColorizer(newStretchColorizer_default);
  }
});

  // Create a new colorizer definition using default constructor.
  StretchColorizerDefinition stretchColorizerDef = new StretchColorizerDefinition();
  var rasterLayerCreationParams = new RasterLayerCreationParams(new Uri(url))
  {
    Name = layerName,
    ColorizerDefinition = stretchColorizerDef,
    MapMemberIndex = 0
  };
  await QueuedTask.Run(() =>
  {
    // Create an image service layer using the colorizer definition created above.
    ImageServiceLayer imageServiceLayer =
LayerFactory.Instance.CreateLayer<ImageServiceLayer>(rasterLayerCreationParams, aMap);
  });