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我正在尝试使用谷歌服务帐户编写一个在线应用程序来访问我的谷歌分析数据.这是我的代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace GA_server2server_POC.Models
{
    using System.Security.Cryptography.X509Certificates;
    using Google.Apis.Analytics.v3;
    using Google.Apis.Analytics.v3.Data;
    using Google.Apis.Authentication.OAuth2;
    using Google.Apis.Authentication.OAuth2.DotNetOpenAuth;
    using Google.Apis.Util;
    using Google.Apis.Services;
    using Google.Apis.Requests;

    public class Oauth_With_API
    {
        public static void ApiTest()
        {
            log4net.Config.XmlConfigurator.Configure();
            const string ServiceAccountId = "xxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com";
            const string ServiceAccountUser = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxdeveloper.gserviceaccount.com";
            AssertionFlowClient client = new AssertionFlowClient(
                GoogleAuthenticationServer.Description, new X509Certificate2("C:\\Users\\rcarter\\Downloads\\xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-privatekey.p12", "notasecret", X509KeyStorageFlags.Exportable))
            {
                Scope = "https://www.googleapis.com/auth/analytics.readonly",
                ServiceAccountId = ServiceAccountUser
            };



            OAuth2Authenticator<AssertionFlowClient> authenticator = new OAuth2Authenticator<AssertionFlowClient>(client, AssertionFlowClient.GetState);

            AnalyticsService service = new AnalyticsService(new BaseClientService.Initializer()
            {
                Authenticator …