c# - 使用google drive SDK下载文件

Question

我遵循了这个例子:

using Google.Apis.Authentication;
using Google.Apis.Drive.v2;
using Google.Apis.Drive.v2.Data;

......
......


/// <summary>
        /// Download a file and return a string with its content.
        /// </summary>
        /// <param name="authenticator">
        /// Authenticator responsible for creating authorized web requests.
        /// </param>
        /// <param name="file">Drive File instance.</param>
        /// <returns>File's content if successful, null otherwise.</returns>
        private System.IO.Stream DownloadFile(IAuthenticator authenticator, Google.Apis.Drive.v2.Data.File file)
        {
            if (!String.IsNullOrEmpty(file.DownloadUrl))
            {
                try
                {
                    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(
                        new Uri(file.DownloadUrl));
                    authenticator.ApplyAuthenticationToRequest(request);
                    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                    if (response.StatusCode == HttpStatusCode.OK)
                    {
                        return response.GetResponseStream();
                    }
                    else
                    {
                        Console.WriteLine(
                            "An error occurred: " + response.StatusDescription);
                        return null;
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine("An error occurred: " + e.Message);
                    return null;
                }
            }
            else
            {
                // The file doesn't have any content stored on Drive.
                return null;
            }
        }

但是无论如何都找不到使用 Google.Apis.Authentication 的命名空间所以入参IAuthenticator authenticator无法解析

我已经从 Nuget 安装了

Google APIs Client Library

Google.api.drive.v2 Client Library

我错过了什么？

Answer 1

不幸的是，我遇到了与您描述的相同的问题，并且 API 文档没有提供足够的信息来说明 IAuthenticator 是什么。正如 rajanmhr47 所说，它不再受支持并将被删除。

解决方法如下:

假设您有一个用于向 Google Drive API 服务器进行身份验证的 DriveService 实例变量，您可以像这样使用它来下载您有权访问的文件:

注意:这些方法不执行任何错误检查。

异步版本:

public static async Task<byte[]> DownloadFile(DriveService driveService, string fileId)
{
    var file = await driveService.Files.Get(fileId).ExecuteAsync();
    return await driveService.HttpClient.GetByteArrayAsync(file.DownloadUrl);
}

同步版本:

public static byte[] DownloadFile(DriveService driveService, string fileId)
{
    var file = driveService.Files.Get(fileId).Execute();
    return driveService.HttpClient.GetByteArrayAsync(file.DownloadUrl).Result;
}