Google 云端硬盘 API v3 使用 JSON 而不是 P12(服务帐号) - 意外字符

错误：解析值时遇到意外字符：e. 路径 ''，第 0 行，位置 0。

我正在使用Google .Net Client库来访问Google驱动器API v3，特别是Google.Apis.Drive.v3软件包。 我授权将"服务帐户"与 C# 一起使用。

使用 p12 密钥进行授权没有问题。但是，建议使用 JSON 并保留 p12 格式以实现向后兼容性。

我从 Google 开发人员控制台下载了 JSON 文件，并尝试使用以下代码进行授权：

    public static Google.Apis.Drive.v3.DriveService AuthenticateServiceAccountJSON(string keyFilePath) {
        // check the file exists
        if (!File.Exists(keyFilePath)) {
            Console.WriteLine("An Error occurred - Key file does not exist");
            return null;
        }
        string[] scopes = new string[] { DriveService.Scope.Drive,                  // view and manage your files and documents
                                         DriveService.Scope.DriveAppdata,           // view and manage its own configuration data
                                         DriveService.Scope.DriveFile,              // view and manage files created by this app
                                         DriveService.Scope.DriveMetadataReadonly,  // view metadata for files
                                         DriveService.Scope.DriveReadonly,          // view files and documents on your drive
                                         DriveService.Scope.DriveScripts };         // modify your app scripts     
        try {
            using (var stream = new FileStream(keyFilePath, FileMode.Open, FileAccess.Read)) {
                var credential = GoogleCredential.FromStream(stream);
                if (credential.IsCreateScopedRequired) {
                    credential.CreateScoped(scopes);
                }
                // Create the service.
                Google.Apis.Drive.v3.DriveService service = new Google.Apis.Drive.v3.DriveService(new BaseClientService.Initializer() {
                    HttpClientInitializer = credential,
                    ApplicationName = "MyDrive",
                });
                return service;
            }
        } catch (Exception ex) {
            Console.WriteLine(ex.InnerException);
            return null;
        }
    }

我已经在记事本中查看了 JSON 文件，它似乎是加密的。

"ewogICJ0eXBlIjogInNlcnZpY2VfYWNjb3VudCIsCiAgInByb2plY3RfaWQiOiOiAicmFkaWFudC1tZXJjdXJ5LTEyMjkwNyIsCiAgIn.........."

可以

继续使用P12吗？

private AnalyticsReportingService service;
public async Task GetAuthorizationByServiceAccount()
    {
        string[] scopes = new string[] { AnalyticsReportingService.Scope.AnalyticsReadonly }; // Put your scopes here
        var keyFilePath = AppContext.BaseDirectory + @"KeyFile.json";
        //Console.WriteLine("Key File: " + keyFilePath);
        var stream = new FileStream(keyFilePath, FileMode.Open, FileAccess.Read);
        var credential = GoogleCredential.FromStream(stream);
        credential = credential.CreateScoped(scopes);
        service = new AnalyticsReportingService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = "<Your App Name here>",
        });
    }

GoogleCredential.FromStream(stream)

{
  "type": "service_account",
  "project_id": "",
  "private_key_id": "",
  "private_key": "-----BEGIN PRIVATE KEY-----
---END PRIVATE KEY-----'n",
  "client_email": "",
  "client_id": "",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://accounts.google.com/o/oauth2/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": ""
}