如何在c#中从google drive下载文件？

using Google.Apis.Auth.OAuth2;
using Google.Apis.Drive.v3;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using System;
using System.IO;
using System.Threading;

public class GoogleDriveDownloader
{
    private static string[] Scopes = { DriveService.Scope.DriveReadonly };
    private static string ApplicationName = "Your Application Name";

    public static void Main(string[] args)
    {
        UserCredential credential;

        using (var stream = new FileStream("credentials.json", FileMode.Open, FileAccess.Read))
        {
            string credPath = "token.json";
            credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
                GoogleClientSecrets.Load(stream).Secrets,
                Scopes,
                "user",
                CancellationToken.None,
                new FileDataStore(credPath, true)).Result;
            Console.WriteLine("Credential file saved to: " + credPath);
        }

        // 创建Drive API服务
        var service = new DriveService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = ApplicationName,
        });

        // 下载文件
        string fileId = "your-file-id";
        string filePath = "path-to-save-file";
        DownloadFile(service, fileId, filePath);
    }

    private static void DownloadFile(DriveService service, string fileId, string filePath)
    {
        var request = service.Files.Get(fileId);
        var stream = new MemoryStream();
        request.MediaDownloader.ProgressChanged += (Google.Apis.Download.IDownloadProgress progress) =>
        {
            switch (progress.Status)
            {
                case Google.Apis.Download.DownloadStatus.Downloading:
                    {
                        Console.WriteLine(progress.BytesDownloaded);
                        break;
                    }
                case Google.Apis.Download.DownloadStatus.Completed:
                    {
                        using (var fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write))
                        {
                            stream.Seek(0, SeekOrigin.Begin);
                            stream.CopyTo(fileStream);
                        }
                        Console.WriteLine("Downloaded successfully");
                        break;
                    }
                case Google.Apis.Download.DownloadStatus.Failed:
                    {
                        Console.WriteLine("Download failed");
                        break;
                    }
            }
        };
        request.Download(stream);
    }
}