complete authication with oauth and azure in csharp

To complete authentication with OAuth and Azure in C#, you can follow the steps below:

1. Create an Azure AD application:

   • Login to Azure Portal and go to Azure Active Directory.
   • Choose App registrations and then click on the "New registration" button.
   • Fill in the necessary details and choose "Web" as the type of app.
   • Make a note of the Application (client) ID and Tenant ID.

2. Add API permission:

   • Go to "API permissions" in your app registration and click "Add a permission".
   • Choose Microsoft Graph API and select the needed permission.

3. Configure the authorization code flow:

   • In the app registration, go to "Authentication" and add the redirect URI.
   • Add code to handle the redirect after the user logs in.

4. Get user access token:

   • Use the authorization code to get the access token from Azure.
   • Send a POST request to the token endpoint with the necessary parameters.

5. Call Graph API:

   • Use the access token to call the Microsoft Graph API.
   • This will allow you to retrieve or modify user information.

Here's some code to get you started:

main.cs
// Configure Azure AD authentication
confidentialClientApplication = ConfidentialClientApplicationBuilder.Create(clientId)
                                             .WithRedirectUri(redirectUri)
                                             .WithClientSecret(clientSecret)
                                             .WithAuthority(new Uri($"https://login.microsoftonline.com/{tenantId}"))
                                             .Build();
string[] scopes = new string[] { "User.Read" };

// Create the sign-in flow
AuthorizationCodeProvider authProvider = new AuthorizationCodeProvider(confidentialClientApplication, scopes);

// Get the access token
string code = Request.Query["code"];
AuthenticationResult authenticationResult = await authProvider.ValidateExchangeResultAsync(code);

// Call Graph API with the access token
GraphServiceClient graphClient = new GraphServiceClient(authProvider);
var me = await graphClient.Me.Request().GetAsync();
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This is just an example and you may need to modify it to fit your specific scenario. Make sure to handle errors and exceptions properly, and follow Microsoft's guidelines for securing your Azure AD app.