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如何让Google Drive API v3示例在C#中工作?

要在C#中使用Google Drive API v3,您需要遵循以下步骤:

  1. 创建Google Cloud Platform项目
    • 访问Google Cloud Console。
    • 创建一个新项目或选择一个现有的项目。
    • 启用Google Drive API。
  2. 安装Google.Apis.Drive.v3 NuGet包
    • 在您的C#项目中,打开NuGet包管理器。
    • 搜索并安装Google.Apis.Drive.v3包。
  3. 设置认证
    • 您需要创建OAuth 2.0凭据来认证您的应用程序。
    • 在Google Cloud Console中,导航到“凭据”页面,然后点击“创建凭据”并选择“OAuth 2.0 客户端 ID”。
    • 配置OAuth同意屏幕,然后创建客户端ID和客户端密钥。
    • 下载JSON格式的凭据文件,并将其保存到您的项目中。
  4. 编写代码
    • 使用以下代码示例作为起点,根据您的需求进行调整。
代码语言:javascript
复制
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Drive.v3;
using Google.Apis.Services;
using Google.Apis.Util.Store;

namespace GoogleDriveExample
{
    class Program
    {
        // 如果修改这些范围,请删除token.json文件。
        static string[] Scopes = { DriveService.Scope.DriveReadonly };
        static string ApplicationName = "Google Drive API .NET Quickstart";

        static async Task Main(string[] args)
        {
            var credential = await GetUserCredentialAsync();
            var service = new DriveService(new BaseClientService.Initializer
            {
                HttpClientInitializer = credential,
                ApplicationName = ApplicationName,
            });

            // 示例:列出文件
            await ListFilesAsync(service);
        }

        private static async Task<UserCredential> GetUserCredentialAsync()
        {
            using var stream =
                new FileStream("credentials.json", FileMode.Open, FileAccess.Read);
            string credPath = "token.json";
            return await GoogleWebAuthorizationBroker.AuthorizeAsync(
                GoogleClientSecrets.Load(stream).Secrets,
                Scopes,
                "user",
                CancellationToken.None,
                new FileDataStore(credPath, true));
        }

        private static async Task ListFilesAsync(DriveService service)
        {
            var request = service.Files.List();
            request.PageSize = 10;
            request.Fields = "nextPageToken, files(id, name)";

            var files = await request.ExecuteAsync();
            if (files.Files == null || files.Files.Count == 0)
                Console.WriteLine("No files found.");
            else
            {
                Console.WriteLine("Files:");
                foreach (var file in files.Files)
                {
                    Console.WriteLine($"{file.Name} ({file.Id})");
                }
            }
        }
    }
}
  1. 运行代码
    • 运行您的应用程序,它将打开一个浏览器窗口,要求您登录到您的Google账户并授权应用程序访问您的Google Drive。
    • 授权后,应用程序将使用访问令牌来调用Google Drive API,并执行您编写的操作(例如列出文件)。
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