API аналитики Google и .NET

 //For this you will have to add some dll in your .net project i.e.
 using DotNetOpenAuth.OAuth2;
 using Google.Apis.Authentication.OAuth2;
 using Google.Apis.Authentication.OAuth2.DotNetOpenAuth;
 using Google.Apis.Analytics.v3;
 using Google.Apis.Analytics.v3.Data;
 using Google.Apis.Services;

 public ActionResult GetAnalyticsData(string GroupType, string date_from, string date_to)
    {
        try
        {

            AnalyticsService gas = AuthenticateUser();

            // Creating our query
            DataResource.GaResource.GetRequest r = gas.Data.Ga.Get("ga:88028792", date_from, date_to, "ga:visits, ga:pageviews, ga:users, ga:newUsers, ga:sessions");
            //Hour,Day,Week,Month
            if (GroupType == "Hour") { r.Dimensions = "ga:nthHour"; }
            else if (GroupType == "Day") { r.Dimensions = "ga:nthDay"; }
            else if (GroupType == "Week") { r.Dimensions = "ga:nthWeek"; }
            else if (GroupType == "Month") { r.Dimensions = "ga:nthMonth"; }


            //d: Execute and fetch the results of our query
            GaData d = r.Execute();

            List<TotalsForAllResults> tr = new List<TotalsForAllResults>();
            List<CustomeData> cd = new List<CustomeData>();

            foreach (var item in d.Rows)
            {
                CustomeData mydata = new CustomeData();
               // mydata.CreatedDate = item[0].ToString();
                mydata.visits = Convert.ToInt32(item[1]);
                mydata.pageviews = Convert.ToInt32(item[2]);
                mydata.users = Convert.ToInt32(item[3]);
                mydata.newUsers = Convert.ToInt32(item[4]);
                mydata.sessions = Convert.ToInt32(item[5]);


                #region Date Conversion

                DateTime Now = DateTime.Parse(date_from, CultureInfo.InvariantCulture, DateTimeStyles.None);
                DateTime TempDate = new DateTime(Now.Year, Now.Month, Convert.ToInt32(Now.ToString("dd")));

                if (GroupType == "Day")
                {    
                    TempDate = TempDate.AddDays((Convert.ToInt32(item[0])));  
                    mydata.CreatedDate = TempDate.ToLongDateString();
                }
                else if (GroupType == "Hour")
                {
                    TempDate = TempDate.AddHours((Convert.ToInt32(item[0])));
                    mydata.CreatedDate = TempDate.ToString("dddd, MMM dd, yyyy hh:mm tt"); 
                }
                else if (GroupType == "Month")
                {                        
                    TempDate = TempDate.AddMonths((Convert.ToInt32(item[0])));
                    mydata.CreatedDate = TempDate.ToString("MMMM, yyyy");
                }
                else
                {
                    //DateTime NewDate = DateTime.Parse(date_from, CultureInfo.InvariantCulture, DateTimeStyles.None);
                    //NewDate = NewDate.AddDays(((Convert.ToInt32(item[0]) + 1) - 1) * 7);
                    //string NewDate1 = NewDate.ToLongDateString();
                    mydata.CreatedDate = item[0].ToString();
                }

                #endregion

                cd.Add(mydata);
            }

            foreach (var item in d.TotalsForAllResults)
            {
                TotalsForAllResults tfa = new TotalsForAllResults();
                tfa.metrics = item.Key;
                tfa.count = Convert.ToInt32(item.Value);
                tr.Add(tfa);
            }

            // At this point, d should contain the number of visitors you got between dates
            return Json(new { TotalsForAllResults = tr, LineChartData = cd });
        }
        catch (Exception ex)
        {
            return Json(null);
        }



    }

 public AnalyticsService AuthenticateUser()
    {
        // This is the physical path to the key file you downloaded when you created your Service Account
        String key_file = @"E:\be8eab1c9893eac9f9fdac95cd64bcc58c86a158-privatekey.p12";//@"C:\Users\path\XXXXX-privatekey.p12";

        // Is the "Email Address", not the "Client ID" one!!!
        String client_id = "450122396803-jt0vt4do8ui6ah74iv1idh1pt9jsvqa6@developer.gserviceaccount.com"; //"0000000-xxxxx@developer.gserviceaccount.com";

        // Probably the password for all is "notasecret"
        String key_pass = "notasecret";

        String scope_url = "https://www.googleapis.com/auth/" + Google.Apis.Analytics.v3.AnalyticsService.Scopes.Analytics.ToString().ToLower();
        //scope_url = "https://www.googleapis.com/auth/analytics";
        //scope_url = "https://www.googleapis.com/auth/analytics.readonly";

        AuthorizationServerDescription desc = GoogleAuthenticationServer.Description;
        X509Certificate2 key = new X509Certificate2(key_file, key_pass, X509KeyStorageFlags.Exportable);

        AssertionFlowClient client = new AssertionFlowClient(desc, key) { ServiceAccountId = client_id, Scope = scope_url };
        OAuth2Authenticator<AssertionFlowClient> auth = new OAuth2Authenticator<AssertionFlowClient>(client, AssertionFlowClient.GetState);
        //AnalyticsService gas = new AnalyticsService(auth);
        AnalyticsService gas = new AnalyticsService(new BaseClientService.Initializer() { Authenticator = auth });

        return gas;
    }

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

namespace GAExampleMVC.Models
{
public class TotalsForAllResults
{
    public string metrics { get; set; }
    public int count { get; set; }
    public double Percent { get; set; }
    public DateTime Time { get; set; }

}

public class CustomeData
{
    public string CreatedDate { get; set; }
    public int visits { get; set; }
    public int pageviews { get; set; }
    public int users { get; set; }
    public int newUsers { get; set; }
    public int sessions { get; set; }
    public string avgSessionDuration { get; set; }
    public double bounceRate { get; set; }
    public double percentNewSessions { get; set; }
    public double percentNewVisits { get; set; }
    public string Location { get; set; }
    public int uniquePageviews { get; set; }
    public string pagePath { get; set; }


}

}

Check out my post location here: http://www.akamarketing.com/blog/103-introducing-google-analytics-api-with-aspnet-c.html

It's not using the built in library you mention but it's working pretty well. The whole API is XML/HTTP so it's pretty handy to use. You basically ask Google for a webpage and examine the response for what you need.