Add project files.

GisDevelop_Exp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.11.35222.181
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GisDevelop_Exp", "GisDevelop_Exp\GisDevelop_Exp.csproj", "{D8D17B02-9E63-4EE1-BAE5-8910D754A5A2}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{D8D17B02-9E63-4EE1-BAE5-8910D754A5A2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D8D17B02-9E63-4EE1-BAE5-8910D754A5A2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D8D17B02-9E63-4EE1-BAE5-8910D754A5A2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D8D17B02-9E63-4EE1-BAE5-8910D754A5A2}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {3C956326-3633-4C7A-9B10-E944309FAD17}
+	EndGlobalSection
+EndGlobal

GisDevelop_Exp/App.xaml

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+<Application x:Class="GisDevelop_Exp.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:GisDevelop_Exp"
+             Startup="Application_Startup"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

GisDevelop_Exp/App.xaml.cs

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+using Esri.ArcGISRuntime;
+using Esri.ArcGISRuntime.Http;
+using Esri.ArcGISRuntime.Security;
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace GisDevelop_Exp
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+        private void Application_Startup(object sender, StartupEventArgs e)
+        {
+            /* Authentication for ArcGIS location services:
+             * Use of ArcGIS location services, including basemaps and geocoding, requires either:
+             * 1) User authentication: Automatically generates a unique, short-lived access token when a user signs in to your application with their ArcGIS account
+             *    giving your application permission to access the content and location services authorized to an existing ArcGIS user's account.
+             * 2) API key authentication: Uses a long-lived access token to authenticate requests to location services and private content.
+             *    Go to https://links.esri.com/create-an-api-key to learn how to create and manage an API key using API key credentials, and then call 
+             *    .UseApiKey("Your ArcGIS location services API Key")
+             *    in the initialize call below. */
+
+            /* Licensing:
+             * Production deployment of applications built with the ArcGIS Maps SDK requires you to license ArcGIS functionality.
+             * For more information see https://links.esri.com/arcgis-runtime-license-and-deploy.
+             * You can set the license string by calling .UseLicense(licenseString) in the initialize call below 
+             * or retrieve a license dynamically after signing into a portal:
+             * ArcGISRuntimeEnvironment.SetLicense(await myArcGISPortal.GetLicenseInfoAsync()); */
+            try
+            {
+                // Initialize the ArcGIS Maps SDK runtime before any components are created.
+                ArcGISRuntimeEnvironment.Initialize(config => config
+                // .UseLicense("[Your ArcGIS Maps SDK license string]")
+                // .UseApiKey("[Your ArcGIS location services API key]")
+                  .ConfigureAuthentication(auth => auth
+                     .UseDefaultChallengeHandler() // Use the default authentication dialog
+                  // .UseOAuthAuthorizeHandler(myOauthAuthorizationHandler) // Configure a custom OAuth dialog
+                   )
+                );
+                // Enable support for TimestampOffset fields, which also changes behavior of Date fields.
+                // For more information see https://links.esri.com/DotNetDateTime
+                ArcGISRuntimeEnvironment.EnableTimestampOffsetSupport = true;
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show(ex.ToString(), "ArcGIS Maps SDK runtime initialization failed.");
+
+                // Exit application
+                this.Shutdown();
+            }
+        }
+    }
+}

GisDevelop_Exp/GisDevelop_Exp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
+    <SupportedOSPlatformVersion>10.0.19041.0</SupportedOSPlatformVersion>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+    <RuntimeIdentifiers>win-x86;win-x64;win-arm64</RuntimeIdentifiers>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Esri.ArcGISRuntime.WPF">
+      <Version>200.5.0</Version>
+    </PackageReference>
+  </ItemGroup>
+
+</Project>

GisDevelop_Exp/MainWindow.xaml

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+<Window x:Class="GisDevelop_Exp.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:esri="http://schemas.esri.com/arcgis/runtime/2013"
+        xmlns:local="clr-namespace:GisDevelop_Exp"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Window.Resources>
+        <local:MapViewModel x:Key="MapViewModel" />
+    </Window.Resources>
+    <Grid>
+        <esri:MapView Map="{Binding Map, Source={StaticResource MapViewModel}}" />
+    </Grid>
+</Window>

GisDevelop_Exp/MainWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace GisDevelop_Exp
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

GisDevelop_Exp/MapViewModel.cs

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+using Esri.ArcGISRuntime.Data;
+using Esri.ArcGISRuntime.Geometry;
+using Esri.ArcGISRuntime.Location;
+using Esri.ArcGISRuntime.Mapping;
+using Esri.ArcGISRuntime.Security;
+using Esri.ArcGISRuntime.Symbology;
+using Esri.ArcGISRuntime.Tasks;
+using Esri.ArcGISRuntime.UI;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GisDevelop_Exp
+{
+    /// <summary>
+    /// Provides map data to an application
+    /// </summary>
+    public class MapViewModel : INotifyPropertyChanged
+    {
+        public MapViewModel()
+        {
+            _map = new Map(SpatialReferences.WebMercator)
+            {
+                InitialViewpoint = new Viewpoint(new Envelope(-180, -85, 180, 85, SpatialReferences.Wgs84)),
+#warning To use ArcGIS location services (including basemaps) specify your API Key access token or require the user to sign in using a valid ArcGIS account.
+                //Basemap = new Basemap(BasemapStyle.ArcGISStreets)
+            };
+        }
+
+        private Map _map;
+
+        /// <summary>
+        /// Gets or sets the map
+        /// </summary>
+        public Map Map
+        {
+            get => _map;
+            set { _map = value; OnPropertyChanged(); }
+        }
+
+        /// <summary>
+        /// Raises the <see cref="MapViewModel.PropertyChanged" /> event
+        /// </summary>
+        /// <param name="propertyName">The name of the property that has changed</param>
+        protected void OnPropertyChanged([CallerMemberName] string? propertyName = null) =>
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+
+        public event PropertyChangedEventHandler? PropertyChanged;
+    }
+}