WPF / Winforms

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WPF / Winforms

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This tutorial demonstrates how to add user login to a Windows Forms C# application using Auth0. We recommend you to Log in to follow this quickstart with examples configured for your account.

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2 minutes

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System requirements: Microsoft Visual Studio 2017 | .NET Framework 4.5.2

New to Auth? Learn How Auth0 works, how it integrates with Native Applications and which protocol it uses.

Configure Auth0

Get Your Application Keys

When you signed up for Auth0, a new application was created for you, or you could have created a new one.

Your will need some details about that application to communicate with Auth0. You can get these details from the Application Settings section in the Auth0 dashboard.

You need the following information:

  • Client ID
  • Domain

If you download the sample from the top of this page these details are filled out for you.

If you have more than one application in your account, the sample comes with the values for your Default App.

App Dashboard

Configure Callback URLs

A callback URL is a URL in your application where Auth0 redirects the user after they have authenticated.

You need to whitelist the callback URL for your app in the Allowed Callback URLs field in your Application Settings. If you do not set any callback URL, your users will see a mismatch error when they log in.

If you are following along with the sample project you downloaded from the top of this page, you should set the Allowed Callback URL to https://YOUR_AUTH0_DOMAIN/mobile.

Integrate Auth0 in your Application

Install Dependencies

The Auth0.OidcClient.WPF or Auth0.OidcClient.WinForms NuGet packages helps you authenticate users with any Auth0 supported identity provider.

Use the NuGet Package Manager (Tools -> Library Package Manager -> Package Manager Console) to install the Auth0.OidcClient.WPF or Auth0.OidcClient.WinForms package, depending on whether you are building a WPF or Windows Forms application:

Trigger Authentication

To integrate Auth0 login into your application, simply instantiate an instance of the Auth0Client class, passing your Auth0 Domain and Client ID in the constructor.

// Form1.cs

using Auth0.OidcClient;

var client = new Auth0Client(new Auth0ClientOptions
{
    Domain = "YOUR_AUTH0_DOMAIN",
    ClientId = "YOUR_CLIENT_ID"
});

You can then call the LoginAsync method to log the user in:

var loginResult = await client.LoginAsync();

This will load the Auth0 login page into a web view. You can learn how to customize the login page in this document.

Handle Authentication Tokens

The returned login result will indicate whether authentication was successful, and if so contain the tokens and claims of the user.

Authentication Error

You can check the IsError property of the result to see whether the login has failed. The ErrorMessage will contain more information regarding the error which occurred.

// Form1.cs

var loginResult = await client.LoginAsync();

if (loginResult.IsError)
{
    Debug.WriteLine($"An error occurred during login: {loginResult.Error}")
}

Accessing the tokens

On successful login, the login result will contain the ID Token and Access Token in the IdentityToken and AccessToken properties respectively.

// Form1.cs

var loginResult = await client.LoginAsync();

if (!loginResult.IsError)
{
    Debug.WriteLine($"id_token: {loginResult.IdentityToken}");
    Debug.WriteLine($"access_token: {loginResult.AccessToken}");
}

Obtaining the User Information

On successful login, the login result will contain the user information in the User property, which is a ClaimsPrincipal.

To obtain information about the user, you can query the claims. You can for example obtain the user's name and email address from the name and email claims:

// Form1.cs

if (!loginResult.IsError)
{
    Debug.WriteLine($"name: {loginResult.User.FindFirst(c => c.Type == "name")?.Value}");
    Debug.WriteLine($"email: {loginResult.User.FindFirst(c => c.Type == "email")?.Value}");
}

The exact claims returned will depend on the scopes that were requested. For more information see @scopes.

You can obtain a list of all the claims contained in the ID Token by iterating through the Claims collection:

// Form1.cs

if (!loginResult.IsError)
{
    foreach (var claim in loginResult.User.Claims)
    {
        Debug.WriteLine($"{claim.Type} = {claim.Value}");
    }
}
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