Quickstart: Sign in users and call Microsoft Graph in a Windows desktop app - Microsoft identity platform

Articol
10/23/2023

In this quickstart, you download and run a code sample that demonstrates how a Windows Presentation Foundation (WPF) application can sign in users and get an access token to call the Microsoft Graph API. The desktop app you build uses the authorization code flow paired with the Proof Key for Code Exchange (PKCE) standard.

See How the sample works for an illustration.

Prerequisites

Visual Studio with the Universal Windows Platform development workload installed

Register and download your quickstart app

You have two options to start your quickstart application:

[Express] Option 1: Register and auto configure your app and then download your code sample
[Manual] Option 2: Register and manually configure your application and code sample

Option 1: Register and auto configure your app and then download your code sample

Go to the Microsoft Entra admin center - App registrationsquickstart experience.
Enter a name for your application and select Register.
Follow the instructions to download and automatically configure your new application with just one click.

Option 2: Register and manually configure your application and code sample

Step 1: Register your application

Tip

Steps in this article might vary slightly based on the portal you start from.

To register your application and add the app's registration information to your solution manually, follow these steps:

Sign in to the Microsoft Entra admin center.
If you have access to multiple tenants, use the Settings icon in the top menu to switch to the tenant in which you want to register the application from the Directories + subscriptions menu.
Browse to Identity > Applications > App registrations, select New registration.
Enter a Name for your application, for example Win-App-calling-MsGraph. Users of your app might see this name, and you can change it later.
In the Supported account types section, select Accounts in any organizational directory and personal Microsoft accounts (for example, Skype, Xbox, Outlook.com).
Select Register to create the application.
Under Manage, select Authentication.
Select Add a platform > Mobile and desktop applications.
In the Redirect URIs section, select https://login.microsoftonline.com/common/oauth2/nativeclient and in Custom redirect URIs add ms-appx-web://microsoft.aad.brokerplugin/{client_id} where {client_id} is the application (client) ID of your application (the same GUID that appears in the msal{client_id}://auth checkbox).
Select Configure.

Step 2: Download the project

Download the WPF sample application

Tip

To avoid errors caused by path length limitations in Windows, we recommend extracting the archive or cloning the repository into a directory near the root of your drive.

Step 3: Configure the project

Extract the zip file to a local folder close to the root of the disk, for example, C:\Azure-Samples.
Open the project in Visual Studio.

Edit App.Xaml.cs and replace the values of the fields ClientId and Tenant with the following code:

private static string ClientId = "Enter_the_Application_Id_here";
private static string Tenant = "Enter_the_Tenant_Info_Here";

Where:

Enter_the_Application_Id_here - is the Application (client) ID for the application you registered.

To find the value of Application (client) ID, go to the app's Overview page in the Microsoft Entra admin center.
Enter_the_Tenant_Info_Here - is set to one of the following options:
- If your application supports Accounts in this organizational directory, replace this value with the Tenant Id or Tenant name (for example, contoso.microsoft.com)
- If your application supports Accounts in any organizational directory, replace this value with organizations
- If your application supports Accounts in any organizational directory and personal Microsoft accounts, replace this value with common.
  
  To find the values of Directory (tenant) ID and Supported account types, go to the app's Overview page in the Microsoft Entra admin center.

Step 4: Run the application

To build and run the sample application in Visual Studio, select the Debug menu > Start Debugging, or press the F5 key. Your application's MainWindow is displayed.

When the app's main window appears, select the Call Microsoft Graph API button. You'll be prompted to sign in using your Microsoft Entra account (work or school account) or Microsoft account (live.com, outlook.com) credentials.

If you're running the application for the first time, you'll be prompted to provide consent to allow the application to access your user profile and sign you in. After consenting to the requested permissions, the application displays that you've successfully logged in. You should see some basic token information and user data obtained from the call to the Microsoft Graph API.

More information

How the sample works

Diagram showing how the sample app generated by this quickstart works.

MSAL.NET

MSAL (Microsoft.Identity.Client) is the library used to sign in users and request tokens used to access an API protected by Microsoft identity platform. You can install MSAL by running the following command in Visual Studio's Package Manager Console:

Install-Package Microsoft.Identity.Client -IncludePrerelease

MSAL initialization

You can add the reference for MSAL by adding the following code:

using Microsoft.Identity.Client;

Then, initialize MSAL using the following code:

IPublicClientApplication publicClientApp = PublicClientApplicationBuilder.Create(ClientId)
                .WithRedirectUri("https://login.microsoftonline.com/common/oauth2/nativeclient")
                .WithAuthority(AzureCloudInstance.AzurePublic, Tenant)
                .Build();

Where:	Description
`ClientId`	Is the Application (client) ID for the application registered in the Microsoft Entra admin center. You can find this value in the app's Overview page in the Microsoft Entra admin center.

Requesting tokens

MSAL has two methods for acquiring tokens: AcquireTokenInteractive and AcquireTokenSilent.

Get a user token interactively

Some situations require forcing users interact with the Microsoft identity platform through a pop-up window to either validate their credentials or to give consent. Some examples include:

The first time users sign in to the application
When users may need to reenter their credentials because the password has expired
When your application is requesting access to a resource that the user needs to consent to
When two factor authentication is required

authResult = await app.AcquireTokenInteractive(_scopes)
                                      .ExecuteAsync();

Where:	Description
`_scopes`	Contains the scopes being requested, such as `{ "user.read" }` for Microsoft Graph or `{ "api://<Application ID>/access_as_user" }` for custom web APIs.

Get a user token silently

You don't want to require the user to validate their credentials every time they need to access a resource. Most of the time you want token acquisitions and renewal without any user interaction. You can use the AcquireTokenSilent method to obtain tokens to access protected resources after the initial AcquireTokenInteractive method:

var accounts = await app.GetAccountsAsync();
var firstAccount = accounts.FirstOrDefault();
authResult = await app.AcquireTokenSilent(scopes, firstAccount)
                                      .ExecuteAsync();

Where:	Description
`scopes`	Contains the scopes being requested, such as `{ "user.read" }` for Microsoft Graph or `{ "api://<Application ID>/access_as_user" }` for custom web APIs.
`firstAccount`	Specifies the first user in the cache (MSAL support multiple users in a single app).

Help and support

If you need help, want to report an issue, or want to learn about your support options, see Help and support for developers.

Next steps

Try out the Windows desktop tutorial for a complete step-by-step guide on building applications and new features, including a full explanation of this quickstart.

Call Graph API tutorial

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