Display KML

<UserControl x:Class="ArcGIS.WinUI.Samples.DisplayKml.DisplayKml"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls">
    <Grid>
        <esriUI:SceneView x:Name="MySceneView" />
        <Border Style="{StaticResource BorderStyle}">
            <StackPanel Orientation="Vertical">
                <TextBlock FontWeight="SemiBold"
                           HorizontalTextAlignment="Center"
                           Text="Choose a KML data source." />
                <ComboBox x:Name="LayerPicker"
                          HorizontalAlignment="Stretch"
                          IsEnabled="False" />
            </StackPanel>
        </Border>
    </Grid>
</UserControl>

// Copyright 2018 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 ArcGIS.Samples.Managers;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Portal;
using Microsoft.UI.Xaml.Controls;
using System;

namespace ArcGIS.WinUI.Samples.DisplayKml
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Display KML",
        category: "Layers",
        description: "Display KML from a URL, portal item, or local KML file.",
        instructions: "Use the UI to select a source. A KML file from that source will be loaded and displayed in the scene.",
        tags: new[] { "KML", "KMZ", "OGC", "keyhole" })]
    [ArcGIS.Samples.Shared.Attributes.OfflineData("324e4742820e46cfbe5029ff2c32cb1f")]
    public partial class DisplayKml
    {
        private readonly Envelope _usEnvelope = new Envelope(-144.619561355187, 18.0328662832097, -66.0903762761083, 67.6390975806745, SpatialReferences.Wgs84);

        public DisplayKml()
        {
            InitializeComponent();
            Initialize();
        }

        private void Initialize()
        {
            // Set up the basemap.
            MySceneView.Scene = new Scene(BasemapStyle.ArcGISImagery);

            // Update the UI.
            LayerPicker.IsEnabled = true;
            LayerPicker.ItemsSource = new[] { "URL", "Local file", "Portal item" };
            LayerPicker.SelectionChanged += LayerPicker_SelectionChanged;
            LayerPicker.SelectedIndex = 0;
        }

        private async void LayerPicker_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Clear existing layers.
            MySceneView.Scene.OperationalLayers.Clear();

            // Get the name of the selected layer.
            string name = e.AddedItems[0].ToString();

            try
            {
                // Create the layer using the chosen constructor.
                KmlLayer layer;
                switch (name)
                {
                    case "URL":
                    default:
                        layer = new KmlLayer(new Uri("https://www.spc.noaa.gov/products/outlook/SPC_outlooks.kml"));
                        break;

                    case "Local file":
                        string filePath = DataManager.GetDataFolder("324e4742820e46cfbe5029ff2c32cb1f", "US_State_Capitals.kml");
                        layer = new KmlLayer(new Uri(filePath));
                        break;

                    case "Portal item":
                        ArcGISPortal portal = await ArcGISPortal.CreateAsync();
                        PortalItem item = await PortalItem.CreateAsync(portal, "9fe0b1bfdcd64c83bd77ea0452c76253");
                        layer = new KmlLayer(item);
                        break;
                }

                // Add the selected layer to the map.
                MySceneView.Scene.OperationalLayers.Add(layer);

                // Zoom to the extent of the United States.
                await MySceneView.SetViewpointAsync(new Viewpoint(_usEnvelope));
            }
            catch (Exception ex)
            {
                await new MessageDialog2(ex.ToString(), "Error").ShowAsync();
            }
        }
    }
}