List OneDrive root files

Program.cs

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

namespace ConsoleApp18
{
    // needs Microsoft.Graph and Microsoft.Graph.Auth nuget packages
    class Program
    {
        static void Main()
        {
            var prov = new DelegateAuthenticationProvider(async (request) =>
            {
                var res = await GetTokenAsync();
                request.Headers.Authorization = new AuthenticationHeaderValue("bearer", res.AccessToken);

            });

            var client = new GraphServiceClient(prov);
            var items = client.Me.Drive.Root.Children.Request().GetAsync().Result;
            foreach (var item in items)
            {
                Console.WriteLine(item.Name + " id:" + item.Id);
            }
        }

        private static async Task<AuthenticationResult> GetTokenAsync()
        {
            var app = PublicClientApplicationBuilder
                .Create("7c9efca5-2406-48b9-a1dc-e9bcb7d12446") // client id
                .WithRedirectUri("https://login.microsoftonline.com/common/oauth2/nativeclient")
                .Build();

            var scopes = new[] { "User.Read", "Files.Read.All" }; // + drive scope
            var accounts = await app.GetAccountsAsync();
            AuthenticationResult result;
            try
            {
                result = await app.AcquireTokenSilent(scopes, accounts.FirstOrDefault()).ExecuteAsync();
            }
            catch (MsalUiRequiredException)
            {
                result = await app.AcquireTokenInteractive(scopes).ExecuteAsync();
            }
            return result;
        }
    }
}