Map image layer sublayer visibility

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// Copyright 2016 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

using Esri.ArcGISRuntime.Mapping;
using System;
using System.Threading.Tasks;
using System.Windows;

namespace ArcGIS.WPF.Samples.ChangeSublayerVisibility
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Map image layer sublayer visibility",
        category: "Layers",
        description: "Change the visibility of sublayers.",
        instructions: "Each sublayer has a check box which can be used to toggle the visibility of the sublayer.",
        tags: new[] { "layers", "sublayers", "visibility" })]
    public partial class ChangeSublayerVisibility
    {
        public ChangeSublayerVisibility()
        {
            InitializeComponent();

            // Setup the control references and execute initialization
            _ = Initialize();
        }

        private async Task Initialize()
        {
            // Create new Map
            Map myMap = new Map();

            // Create uri to the map image layer
            Uri serviceUri = new Uri(
               "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer");

            // Create new image layer from the url
            ArcGISMapImageLayer imageLayer = new ArcGISMapImageLayer(serviceUri)
            {
                Name = "World Cities Population"
            };

            // Add created layer to the basemaps collection
            myMap.Basemap.BaseLayers.Add(imageLayer);

            // Assign the map to the MapView
            MyMapView.Map = myMap;

            try
            {
                // Wait that the image layer is loaded and sublayer information is fetched
                await imageLayer.LoadAsync();

                // Assign sublayers to the listview
                SublayerListView.ItemsSource = imageLayer.Sublayers;
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString(), "Error");
            }
        }
    }
}