.NET code to extract attachments from Outlook

using Microsoft.Graph;
using Microsoft.Graph.Auth;
using Microsoft.Identity.Client;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

// Define the authentication settings for the Microsoft Graph API
string clientId = "your_client_id_here";
string tenantId = "your_tenant_id_here";
string clientSecret = "your_client_secret_here";
string[] scopes = { "https://graph.microsoft.com/.default" };
IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
    .Create(clientId)
    .WithTenantId(tenantId)
    .WithClientSecret(clientSecret)
    .Build();
ClientCredentialProvider authProvider = new ClientCredentialProvider(confidentialClientApplication, scopes);

// Define the ID of the Outlook email to extract attachments from
string messageId = "your_message_id_here";

// Create an instance of the GraphServiceClient class to interact with the Microsoft Graph API
GraphServiceClient graphClient = new GraphServiceClient(authProvider);

// Define a list to store the extracted attachments
List<Attachment> attachments = new List<Attachment>();

// Use the GraphServiceClient to retrieve the email message with the specified ID, including its attachments
Message message = await graphClient.Me.Messages[messageId].Request().Expand("attachments").GetAsync();

// Loop through each attachment in the email message
foreach (Attachment attachment in message.Attachments)
{
    // Check if the attachment is a file attachment
    if (attachment is FileAttachment fileAttachment)
    {
        // Download the file to a byte array
        byte[] fileContents = await graphClient.Me.Messages[messageId].Attachments[fileAttachment.Id].Content.Request().GetAsync();

        // Define the path and filename to save the attachment to
        string attachmentPath = "C:\\attachments\\" + fileAttachment.Name;

        // Save the file to disk
        File.WriteAllBytes(attachmentPath, fileContents);

        // Add the attachment to the list of extracted attachments
        attachments.Add(fileAttachment);
    }
}

// Display the list of extracted attachments
foreach (Attachment attachment in attachments)
{
    Console.WriteLine("Attachment Name: " + attachment.Name);
}