Change basemap

<UserControl
    x:Class="ArcGIS.UWP.Samples.ChangeBasemap.ChangeBasemap"
    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:MapView x:Name="MyMapView" />
        <Border Style="{StaticResource BorderStyle}">
            <StackPanel>
                <TextBlock Text="Select a basemap"
                           FontWeight="SemiBold"
                           HorizontalAlignment="Center"
                           Margin="0,0,0,5"
                           TextWrapping="Wrap" />
                <ComboBox x:Name="BasemapChooser"
                          HorizontalAlignment="Stretch"
                          SelectionChanged="OnBasemapListSelectionChanged" />
            </StackPanel>
        </Border>
    </Grid>
</UserControl>

// Copyright 2021 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.Collections.Generic;
using System.Linq;
using Windows.UI.Xaml.Controls;

namespace ArcGIS.UWP.Samples.ChangeBasemap
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Change basemap",
        category: "Map",
        description: "Change a map's basemap. A basemap is beneath all layers on a `Map` and is used to provide visual reference for the operational layers.",
        instructions: "Use the drop down menu to select the active basemap from the list of available basemaps.",
        tags: new[] { "basemap", "map" })]
    public partial class ChangeBasemap
    {
        // Dictionary that associates names with basemaps.
        private readonly Dictionary<string, Basemap> _basemapOptions = new Dictionary<string, Basemap>()
        {
            {"Streets", new Basemap(BasemapStyle.ArcGISStreets)},
            {"Streets - Night", new Basemap(BasemapStyle.ArcGISStreetsNight)},
            {"Imagery", new Basemap(BasemapStyle.ArcGISImageryStandard)},
            {"Imagery with Labels", new Basemap(BasemapStyle.ArcGISImagery)},
            {"Dark Gray Canvas", new Basemap(BasemapStyle.ArcGISDarkGray)},
            {"Light Gray Canvas", new Basemap(BasemapStyle.ArcGISLightGray)},
            {"Navigation", new Basemap(BasemapStyle.ArcGISNavigation)},
            {"OpenStreetMap", new Basemap(BasemapStyle.OSMStandard)}
        };

        public ChangeBasemap()
        {
            InitializeComponent();

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

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

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

            // Set titles as an items source and choose the first item
            BasemapChooser.ItemsSource = _basemapOptions.Keys;
            BasemapChooser.SelectedIndex = 0;
        }

        private void OnBasemapListSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Get the title of the selected basemap
            string selectedBasemapTitle = e.AddedItems[0].ToString();

            // Retrieve the basemap from the dictionary
            MyMapView.Map.Basemap = _basemapOptions[selectedBasemapTitle];
        }
    }
}