如何解决Google Drive API异常：‘从JSON创建凭据失败，未知凭据类型’

核心问题 #

你使用的是桌面应用类型的OAuth客户端凭据JSON，但GoogleCredential.FromFile()方法仅适用于加载服务账号密钥或已保存的用户授权令牌，无法直接解析客户端ID/Secret格式的JSON文件——这就是报错的根源。

修复方案 #

1. 替换凭据加载逻辑

桌面应用需要通过OAuth 2.0交互式授权流程获取用户权限，改用GoogleWebAuthorizationBroker处理授权：

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

string[] scopes = { DriveService.Scope.DriveFile };
string credentialsFilePath = "D:\\credentials.json";
// 用于保存授权令牌，避免每次启动都重复登录
string tokenStorageDir = "D:\\RhinoDriveAuthTokens";

UserCredential credential;
using (var stream = new FileStream(credentialsFilePath, FileMode.Open, FileAccess.Read))
{
    credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
        GoogleClientSecrets.Load(stream).Secrets,
        scopes,
        "user",
        CancellationToken.None,
        new FileDataStore(tokenStorageDir, true)).Result;
}

// 创建Drive服务实例
var driveService = new DriveService(new BaseClientService.Initializer()
{
    HttpClientInitializer = credential,
    ApplicationName = "Rhino Drive Upload Plugin" // 需与Google Cloud项目中的应用名称一致
});

2. 修正其他常见错误

• 文件夹ID而非名称：代码中Parents = new[] { "API_Test" }错误，必须使用Drive文件夹的唯一ID。打开你的API_Test文件夹，地址栏末尾的字符串就是ID（如1AbCdEfGhIjKlMnOpQrStUvWxYz），替换成该值。
• 文件路径与权限：确保credentials.json路径正确，且Rhino插件运行时有权限读取该文件（避免放在C:\Program Files等系统保护目录）。
• NuGet包版本：确保安装最新版的Google.Apis.Drive.v3和Google.Apis.Auth NuGet包，版本不匹配可能引发异常。

完整修复代码

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

// 配置参数
string credentialsPath = "D:\\credentials.json";
string tokenStorePath = "D:\\RhinoDriveAuth";
string targetFolderId = "替换为你的API_Test文件夹ID";
string uploadFilePath = "D:\\Points.txt";

// 获取授权凭据
UserCredential credential;
using (var stream = new FileStream(credentialsPath, FileMode.Open, FileAccess.Read))
{
    credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
        GoogleClientSecrets.Load(stream).Secrets,
        new[] { DriveService.Scope.DriveFile },
        "user",
        CancellationToken.None,
        new FileDataStore(tokenStorePath, true)).Result;
}

// 初始化Drive服务
var driveService = new DriveService(new BaseClientService.Initializer()
{
    HttpClientInitializer = credential,
    ApplicationName = "Rhino Drive Uploader"
});

// 准备文件元数据
var fileMetadata = new Google.Apis.Drive.v3.Data.File()
{
    Name = Path.GetFileName(uploadFilePath),
    Parents = new[] { targetFolderId }
};

// 执行上传
using (var stream = new FileStream(uploadFilePath, FileMode.Open))
{
    var uploadRequest = driveService.Files.Create(fileMetadata, stream, "text/plain");
    uploadRequest.Fields = "id";
    var uploadResult = uploadRequest.Upload();

    if (uploadResult.Status == Google.Apis.Upload.UploadStatus.Completed)
    {
        // 上传成功，可在Rhino中提示
        // RhinoApp.WriteLine($"文件上传完成，ID：{uploadRequest.ResponseBody.Id}");
    }
    else
    {
        // 处理错误
        // RhinoApp.WriteLine($"上传失败：{uploadResult.Exception.Message}");
    }
}

内容的提问来源于stack exchange，提问作者bBen1997