using System;

namespace XamarinCodeSharing.Core
{
  public class BlogItem
  {
    public string Title { get; set; }
    public string Link { get; set; }
    public DateTime PublishDate { get; set; }
    public string Description { get; set; }
  }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using System.Xml.Linq;
using System.Net;

namespace XamarinCodeSharing.Core {
  public class XamarinBlog {
    private const string BlogUrl = "http://blog.xamarin.com/feed";

    // blog metadata properties
    public string Title { get; set; }
    public string Link { get; set; }
    public List<BlogItem> Items { get; private set; }

    // Download the feed, parse it and return a blog object
    public static async Task<XamarinBlog> Download() {
      HttpClient client = new HttpClient();
      HttpResponseMessage response = await client.GetAsync(BlogUrl);

      // if all went well, read the feed, otherwise fail
      if(response.IsSuccessStatusCode) {
        return await ParseResponse(response.Content);
      }
      else {
        throw new Exception("There was a problem.");
      }
    }

    // Read the response out of the content and 
    // create objects
    private static async Task<XamarinBlog>ParseResponse(
    HttpContent content) {
      XamarinBlog blog = new XamarinBlog();

    using(Stream stream = await content.ReadAsStreamAsync()) {
      XDocument doc = XDocument.Load(stream);
      XElement channel = doc.Root.Element("channel");

      // load the blog metadata out of the xml
      blog.Title = WebUtility.HtmlDecode(
      channel.Element("title").Value);
      blog.Link = WebUtility.HtmlDecode(
      channel.Element("link").Value);

      // load the blog items out of the xml
      var items = from item in channel.Elements("item")
      select new BlogItem {
        Title = WebUtility.HtmlDecode(
        item.Element("title").Value),
        Link = WebUtility.HtmlDecode(
        item.Element("link").Value),
        PublishDate = DateTime.Parse(
        WebUtility.HtmlDecode(
        item.Element("pubDate").Value)),
        Description = WebUtility.HtmlDecode(
        item.Element("description").Value),
      };
      blog.Items = items.ToList();
    }

    return blog;
    }
  }
}

using System;
using XamarinCodeSharing.Core;
using System.Threading.Tasks;

namespace XamarinCodeSharing.Desktop {
  class MainClass {
    public static void Main(string[] args) {
      GetBlogItems().Wait();

      Console.WriteLine("Press any key to quit.");
      Console.ReadKey();
    }

    private static async Task GetBlogItems() {
      Console.WriteLine("Downloading blog...");
      XamarinBlog blog = await XamarinBlog.Download();
      Console.WriteLine("Download finished.");
      Console.WriteLine();

      Console.WriteLine("{0} ({1} items)",
      blog.Title, blog.Items.Count);

      foreach (var item in blog.Items) {
        Console.WriteLine(item.Title);
        Console.WriteLine(
          item.PublishDate.ToString("d MMMM yyyy"));
        Console.WriteLine(item.Description);
        Console.WriteLine();
      }
    }
  }
}

using System.Collections.Generic;
using System.Linq;
using Android.App;
using Android.OS;
using Android.Runtime;
using Android.Widget;
using XamarinCodeSharing.Core;

namespace XamarinCodeSharing.Droid {
  [Activity(
    Label = "XamarinCodeSharing.Droid", 
    MainLauncher = true, 
    Icon = "@drawable/icon")]
  public class MainActivity : ListActivity {
    private const string TitleKey = "title";
    private const string SubtitleKey = "subtitle";

    protected async override void OnCreate(Bundle bundle) {
      base.OnCreate(bundle);

      var progress = new ProgressDialog(this);
      progress.SetTitle("Downloading blog...");
      progress.SetMessage(
        "Please wait while we download the Xamarin blog...");
      progress.Show();

      XamarinBlog blog = await XamarinBlog.Download();
      var items = from item in blog.Items select new JavaDictionary<string, object> {
        { TitleKey, item.Title },
        { SubtitleKey, item.Description }
      };

      ListAdapter = new SimpleAdapter(
        this,
        items.Cast<IDictionary<string, object>>().ToList(),
        Android.Resource.Layout.SimpleListItem2,
        new []{ TitleKey, SubtitleKey },
        new []{ Android.Resource.Id.Text1, Android.Resource.Id.Text2 });

      progress.Dismiss();
      progress.Dispose();
    }
  }
}