使用OAuth2向Google API进行身份validation

我正在尝试使用C＃/ .NET 执行Google Apps域范围的授权委派中的示例代码，并且像我尝试的其他一些示例一样，创建使用auth变量的对象的代码部分表示他们语法错了。 这是我的代码：

using System; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; using DotNetOpenAuth.OAuth2; using Google.Apis.Authentication.OAuth2; using Google.Apis.Authentication.OAuth2.DotNetOpenAuth; using Google.Apis.Drive.v2; using Google.Apis.Util; namespace GoogleAPIDemo { class DriveServiceObject { private const string SERVICE_ACCOUNT_EMAIL = "@developer.gserviceaccount.com"; private const string SERVICE_ACCOUNT_PKCS12_FILE_PATH = @"pathto-privatekey.p12"; /// 
 /// Build a Drive service object authorized with the service account /// that acts on behalf of the given user. /// 
 /// @param userEmail The email of the user. /// Drive service object. static DriveService BuildService(String userEmail) { X509Certificate2 certificate = new X509Certificate2(SERVICE_ACCOUNT_PKCS12_FILE_PATH, "notasecret", X509KeyStorageFlags.Exportable); var provider = new AssertionFlowClient(GoogleAuthenticationServer.Description, certificate) { ServiceAccountId = SERVICE_ACCOUNT_EMAIL, Scope = DriveService.Scopes.Drive.GetStringValue(), ServiceAccountUser = userEmail, }; var auth = new OAuth2Authenticator(provider, AssertionFlowClient.GetState); return new DriveService(auth); } } } 

我看到的错误是

 (local variable) OAuth2Athenticator auth Error: The best overloaded method match for 'Google.Apis.DriveService.DriveService(Googel.Apis.Services.BaseClientService.Initializer)' has some invalid arguments 

这是我第一次编写一个使用谷歌API的应用程序，任何帮助实现这项工作将不胜感激！

  var provider = new AssertionFlowClient( GoogleAuthenticationServer.Description, new X509Certificate2(privateKeyPath, keyPassword, X509KeyStorageFlags.Exportable)) { ServiceAccountId = serviceAccountEmail, Scope = DriveService.Scopes.Drive.GetStringValue(), ServiceAccountUser = driveHolderAccountEmail }; var auth = new OAuth2Authenticator(provider, AssertionFlowClient.GetState); m_service = new DriveService(new BaseClientService.Initializer() { Authenticator = auth });