有没有办法在查询数据之前验证AnalyticsService

Question

我有以下方法在验证Google Developer服务帐户后返回AnalyticsService。

public static AnalyticsService AuthenticateUsingServiceAccount(string keyfilePath, string serviceAccountEmail)
{
    if (serviceAccountEmail == null)
        throw new ArgumentNullException("serviceAccountEmail", "serviceAccountEmail cannot be a null reference");
    if (keyfilePath == null)
        throw new ArgumentNullException("keyfilePath", "keyfilePath cannot be a null reference");


    if (!File.Exists(keyfilePath))
    {
        throw new FileNotFoundException("Keyfile does not exist");
    }

    string[] scopes = new string[]
    {
        AnalyticsService.Scope.Analytics, // view and manage your analytics data
        AnalyticsService.Scope.AnalyticsEdit, // edit management actives
        AnalyticsService.Scope.AnalyticsManageUsers, // manage users
        AnalyticsService.Scope.AnalyticsReadonly
    }; // View analytics data       

    var certificate = new X509Certificate2(keyfilePath, "notasecret", X509KeyStorageFlags.Exportable);
    var credential = new ServiceAccountCredential(new ServiceAccountCredential.Initializer(serviceAccountEmail)
    {
        Scopes = scopes
    }.FromCertificate(certificate));

    AnalyticsService service = new AnalyticsService(new BaseClientService.Initializer()
    {
        HttpClientInitializer = credential,
        ApplicationName = "My analytics service",
    });

    return service;
}

在返回之前，有没有办法验证service（确保使用正确的密钥文件和正确的服务帐户电子邮件初始化它）？知道new AnalyticsService将始终返回service对象，无论输入参数是否正确。

目前的行为是，如果参数（凭证）不正确，service只会在调用API后抛出异常，对我来说，这有点晚了。