Display a map (.NET MAUI)

Learn how to create and display a map with a basemap layer.

A map contains layers of geographic data. A map contains a basemap layer and, optionally, one or more data layers. You can display a specific area of a map by using a map view and setting the location and zoom level.

In this tutorial, you create and display a map of the Santa Monica Mountains in California using the topographic basemap layer.

The map and code will be used as the starting point for other 2D tutorials.

This tutorial builds a cross-platform app using the .NET Multi-platform App UI (.NET MAUI) framework. .NET MAUI allows you to build native cross-platform apps from a shared code base. If you'd prefer to build this app as a Windows desktop app, see the Windows Presentation Foundation (WPF) version of this tutorial.

Prerequisites

Steps

Create a new Visual Studio Project

ArcGIS Maps SDK for .NET supports apps for Windows Presentation Framework (WPF), Universal Windows Platform (UWP), Windows UI Library (WinUI), and Multi-platform App UI (.NET MAUI). The instructions for this tutorial are specific to creating a .NET MAUI project using Visual Studio for Windows.

1. Start Visual Studio and create a new project.

   • In the Visual Studio start screen, click Create a new project.
   • Choose the .NET MAUI App template for C#. If you don't see the template listed, you can find it by typing MAUI into the Search for templates text box.
   • Click Next.
   • Provide required values in the Configure your new project panel:
     • Project name: DisplayAMap
     • Location: choose a folder
   • Click Next.
     • Choose the .NET 8 as framework you intend to target.
   • Click Create to create the project.

Add a reference to the API

1. Add a reference to the API by installing a NuGet package.

   • In Solution Explorer, right-click Dependencies and choose Manage NuGet Packages.

   • In the NuGet Package Manager window, ensure the selected Package source is nuget.org (upper-right).

   • Select the Browse tab and search for ArcGIS Maps SDK.

   • In the search results, select the appropriate package for your platform. For this tutorial project, choose the Esri.ArcGISRuntime.Maui NuGet package.

   • Confirm the Latest stable version of the package is selected in the Version dropdown.

   • Click Install.

   • The Preview Changes dialog confirms any package(s) dependencies or conflicts. Review the changes and click OK to continue installing the packages.

   • Review the license information on the License Acceptance dialog and click I Accept to add the package(s) to your project.

   • In the Visual Studio Output window, ensure the packages were successfully installed.

   • Close the NuGet Package Manager window.

Correct minimum OS versions

The .NET MAUI App template may have operating system (OS) requirements below what ArcGIS Maps SDK for .NET requires for a .NET MAUI app. You must modify the minimum 0S versions in your .csproj to satisfy the ArcGIS Maps SDK for .NET requirements.

1. In Visual Studio > Solution Explorer, double-click DisplayAMap to open the .csproj.

2. Modify the <SupportedOSPlatformVersion> properties in the <PropertyGroup> as shown below. This reflects the minimum 0S requirements for ArcGIS Maps SDK for .NET MAUI for the current release.

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		<!-- Versions -->
		<ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
		<ApplicationVersion>1</ApplicationVersion>

		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">15.0</SupportedOSPlatformVersion>
		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">14.0</SupportedOSPlatformVersion>
		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">26.0</SupportedOSPlatformVersion>
		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.19041.0</SupportedOSPlatformVersion>
		<TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.19041.0</TargetPlatformMinVersion>

		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>

Get an API key

An API key is required to enable access to services, web maps, and web scenes hosted in ArcGIS Online.

If you haven't already, go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

You will use this API Key below.

Set the API Key in your app

1. In the Solution Explorer, open MauiProgram.cs by double-clicking.

2. Use the existing builder variable in the CreateMauiApp() function to call UseArcGISRuntime(). Use a lambda function to call UseApiKey() on a config parameter to set the ApiKey property on ArcGISRuntimeEnvironment.

   MauiProgram.cs

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   public static class MauiProgram
   {
       public static MauiApp CreateMauiApp()
   	{
   		var builder = MauiApp.CreateBuilder();
   		builder
   			.UseMauiApp<App>()
   			.ConfigureFonts(fonts =>
   			{
   				fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
   				fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
               });
   
   		builder.UseArcGISRuntime(config => config.UseApiKey("YOUR_API_KEY"));
   
   #if DEBUG
           builder.Logging.AddDebug();
   #endif
   
   		return builder.Build();
   	}
   }

3. Save and close the MauiProgram.cs file.

Remove default controls

The .NET MAUI App template provided by Visual Studio has default controls and logic. These must be removed to make room for the map view in your UI.

1. Open the MainPage.xaml file.

2. Remove all controls from the current UI.

   MainPage.xaml

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   <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                x:Class="DisplayAMap.MainPage">
   
       <ScrollView>
           <VerticalStackLayout
               Spacing="25"
               Padding="30,0"
               VerticalOptions="Center">
   
               <Image
                   Source="dotnet_bot.png"
                   SemanticProperties.Description="Cute dot net bot waving hi to you!"
                   HeightRequest="200"
                   HorizontalOptions="Center" />
   
               <Label
                   Text="Hello, World!"
                   SemanticProperties.HeadingLevel="Level1"
                   FontSize="32"
                   HorizontalOptions="Center" />
   
               <Label
                   Text="Welcome to .NET Multi-platform App UI"
                   SemanticProperties.HeadingLevel="Level2"
                   SemanticProperties.Description="Welcome to dot net Multi platform App U I"
                   FontSize="18"
                   HorizontalOptions="Center" />
   
               <Button
                   x:Name="CounterBtn"
                   Text="Click me"
                   SemanticProperties.Hint="Counts the number of times you click"
                   Clicked="OnCounterClicked"
                   HorizontalOptions="Center" />
   
           </VerticalStackLayout>
       </ScrollView>
   
   </ContentPage>

3. Open the MainPage.xaml.cs file.

4. Remove the OnCounterClicked() function and the count variable.

   MainPage.xaml.cs

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   namespace DisplayAMap;
   
   public partial class MainPage : ContentPage
   {
   
       int count = 0;
   
       public MainPage()
       {
           InitializeComponent();
       }
   
       private void OnCounterClicked(object sender, EventArgs e)
       {
           count++;
   
           if (count == 1)
               CounterBtn.Text = $"Clicked {count} time";
           else
               CounterBtn.Text = $"Clicked {count} times";
   
           SemanticScreenReader.Announce(CounterBtn.Text);
       }
   
   }

5. Save and close MainPage.xaml and MainPage.xaml.cs.

Create a view model to store app logic

This app is the foundation for many following tutorials so it's good to build it with a solid design.

The Model-View-ViewModel (MVVM) design pattern provides an architecture that separates user interface elements (and related code) from the underlying app logic. In this pattern, the model represents the data consumed in an app, the view is the user interface, and the view model contains the logic that binds the models and views together. The extra framework required for such a pattern might seem like a lot of work for a small project, but as the complexity of your project grows, a solid design can make your code much more maintainable and flexible.

In an ArcGIS app designed with MVVM, the map view usually provides the main view component. Many of the classes fill the role of models (representing data as maps, layers, graphics, features, and others). Much of the code you write will be for the view model component, since this is where you will add logic to work with ArcGIS objects and provide data for display in the view.

1. Add a new class that will define a view model for the project.

   • Click Project > Add Class ....
   • Name the new class MapViewModel.cs.
   • Click Add to create the new class and add it to the project.
   • The new class will open in Visual Studio.

2. Add required using statements to the view model.

   MapViewModel.cs

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   using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Text;
   using System.Threading.Tasks;
   
   using Esri.ArcGISRuntime.Mapping;
   using Esri.ArcGISRuntime.Geometry;
   using System.ComponentModel;
   using System.Runtime.CompilerServices;
   using Map = Esri.ArcGISRuntime.Mapping.Map;
   

3. Implement the INotifyPropertyChanged interface in the MapViewModel class.

   More info

   This interface defines a PropertyChanged event that is used to notify clients (views) that a property of the view model has changed.

   MapViewModel.cs

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   namespace DisplayAMap
   {
   
       internal class MapViewModel : INotifyPropertyChanged
       {
   

4. Inside the MapViewModel class, add code to implement the PropertyChanged event.

   More info

   When a property of the view model changes, a call to OnPropertyChanged will raise this event.

   MapViewModel.cs

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       internal class MapViewModel : INotifyPropertyChanged
       {
   
           public event PropertyChangedEventHandler PropertyChanged;
           protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
           {
               PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
           }
   
       }
   

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5. Define a new property on the view model called Map that exposes a Map object. When the property is set, call OnPropertyChanged.

   MapViewModel.cs

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       internal class MapViewModel : INotifyPropertyChanged
       {
   
           public event PropertyChangedEventHandler PropertyChanged;
           protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
           {
               PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
           }
   
           private Map _map;
           public Map Map
           {
               get => _map;
               set
               {
                   _map = value;
                   OnPropertyChanged();
               }
           }
   
       }
   

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6. Add a function to the MapViewModel class called SetupMap. This function will create a new map and use it to set the Map property.

   More info

   The map will use a topographic vector tiled basemap.

   MapViewModel.cs

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           private void SetupMap()
           {
   
               // Create a new map with a 'topographic vector' basemap.
               Map = new Map(BasemapStyle.ArcGISTopographic);
   
           }
   

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7. Add code to set the map's InitialViewpoint property to a Viewpoint.

   MapViewModel.cs

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               // Create a new map with a 'topographic vector' basemap.
               Map = new Map(BasemapStyle.ArcGISTopographic);
   
               var mapCenterPoint = new MapPoint(-118.805, 34.027, SpatialReferences.Wgs84);
               Map.InitialViewpoint = new Viewpoint(mapCenterPoint, 100000);
   

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8. Add a constructor to the class that calls SetupMap() when a new MapViewModel is instantiated.

   More info

   When you write code like MapViewModel newMapVM = new MapViewModel();, the class constructor runs. This is a good place to add code that needs to run when the class is initialized.

   MapViewModel.cs

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   namespace DisplayAMap
   {
   
       internal class MapViewModel : INotifyPropertyChanged
       {
   
           public MapViewModel()
           {
               SetupMap();
           }
   

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9. Save and close the MapViewModel.cs file.

Your MapViewModel is complete!

An advantage of using the MVVM design pattern is the ability to reuse code in a view model. Because this API has a nearly-standard API surface across platforms, a view model written for one app typically works on all supported .NET platforms.

Next, you will set up a view in your project to consume the view model.

Add a map view

A MapView control is used to display a map. You will add a map view to your project UI and wire it up to consume the map that is defined on MapViewModel.

1. Add required XML namespace and resource declarations.

   More info

   • Open MainPage.xaml and switch to the XAML view
   • Inside the existing namespace declarations, add an esri XML namespace for the ArcGIS controls and a local XML namespace
   • Add XAML that defines a MapViewModel instance as a static resource
   MainPage.xaml

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   <ContentPage x:Class="DisplayAMap.MainPage"
                xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                xmlns:esri="http://schemas.esri.com/arcgis/runtime/2013"
                xmlns:local="clr-namespace:DisplayAMap">
   
       <ContentPage.Resources>
           <local:MapViewModel x:Key="MapViewModel" />
       </ContentPage.Resources>
   

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2. Add a MapView control to MainPage.xaml and bind it to the MapViewModel.

   More info

   • Add XAML that defines a MapView control named MainMapView
   • Use data binding to set the Map property of the control using the MapViewModel resource
   MainPage.xaml

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   <?xml version="1.0" encoding="utf-8" ?>
   
   <ContentPage x:Class="DisplayAMap.MainPage"
                xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                xmlns:esri="http://schemas.esri.com/arcgis/runtime/2013"
                xmlns:local="clr-namespace:DisplayAMap">
   
       <ContentPage.Resources>
           <local:MapViewModel x:Key="MapViewModel" />
       </ContentPage.Resources>
   
   
       <esri:MapView x:Name="MainMapView" Map="{Binding Map, Source={StaticResource MapViewModel}}" />
   
   </ContentPage>

3. Save and close the MainPage.xaml file.

Run the app

Click Debug > Start Debugging (or press <F5> on the keyboard) to run the app.

Deploy the app to a Windows, Mac, iOS, or Android device. You will see a map with the topographic basemap layer centered on the Santa Monica Mountains in California. Pan and zoom with mouse or touchscreen controls to explore the map.

What's next?

Learn how to use additional API features, ArcGIS location services, and ArcGIS tools in these tutorials:

• Display a web map
• Add a point, line, and polygon
• Display a scene
• Add a feature layer