通过C#使用MFA访问Sharepoint online

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using Microsoft.Identity.Client;

class Program
{
    static async Task Main(string[] args)
    {
        string tenantId = "your-tenant-id";
        string clientId = "your-client-id";
        string clientSecret = "your-client-secret";
        string resource = "https://graph.microsoft.com";
        string authority = $"https://login.microsoftonline.com/{tenantId}";
        string siteUrl = "https://your-sharepoint-site-url";

        IConfidentialClientApplication app = ConfidentialClientApplicationBuilder.Create(clientId)
            .WithClientSecret(clientSecret)
            .WithAuthority(authority)
            .Build();

        string accessToken = await GetAccessTokenAsync(app, resource);

        using (HttpClient httpClient = new HttpClient())
        {
            httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
            HttpResponseMessage response = await httpClient.GetAsync($"{siteUrl}/_api/web/lists");
            string responseBody = await response.Content.ReadAsStringAsync();
            Console.WriteLine(responseBody);
        }
    }

    static async Task<string> GetAccessTokenAsync(IConfidentialClientApplication app, string resource)
    {
        var result = await app.AcquireTokenForClient(new[] { resource }).ExecuteAsync();
        return result.AccessToken;
    }
}