使用BigqueryService时出现身份验证错误

Question

我正在尝试连接到BigQuery项目并使用BigqueryService实例获取数据集列表。我可以使用BigQueryClient成功完成此操作；但是，我需要使用BigqueryService。我想念什么？

static void Main(string[] args)
{
    GoogleCredential credential;
    BigqueryService service;

    string query;

    using (var json = new FileStream("secretkey.json", FileMode.Open, FileAccess.Read))
    {
        credential = GoogleCredential.FromStream(json);

        service = new BigqueryService(new BaseClientService.Initializer
        {
            ApplicationName = "BigQueryTest",
            HttpClientInitializer = credential
        });
    }

    try
    {
        var serviceList = service.Datasets.List("testproject").Execute();
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }

    var client = BigQueryClient.Create("testproject", credential);
    var clientList = client.ListDatasets();

    Console.ReadKey();
}

在运行时，我遇到一个异常，说Service.Datasets.List（）的“请求具有无效的身份验证凭据...”，但是client.ListDatasets（）的运行没有问题。

编辑： 我解决了这个问题。我需要使用GoogleCredential.CreateScoped（）创建我的凭据。工作代码：

credential = GoogleCredential.FromStream(json);
            string[] scopes = new string[] { BigqueryService.Scope.Bigquery 
};
credential = credential.CreateScoped(scopes);

service = new BigqueryService(new BaseClientService.Initializer
{
    ApplicationName = "BigQueryTest",
    HttpClientInitializer = credential
});