using System;
using System.Xml;
using System.Collections.Generic;
using System.ServiceModel.Syndication;

namespace RssGenerator
{
  public partial class _Default : System.Web.UI.Page
  {
    protected void Page_Load(object sender, EventArgs e)
    {
      // Contenuto ipotetico del blog
      var feeds=new []{
        new {Id = 1, Title="Titolo 1", Body="Testo del primo rss", Date=new DateTime(2008,1,1), Category=".Net"},
        new {Id = 2, Title="Titolo 2", Body="Testo del secondo rss", Date=new DateTime(2008,1,2), Category="C#"},
        new {Id = 3, Title="Titolo 3", Body="Testo del terzo rss", Date=new DateTime(2008,1,3), Category=".Net"},
        new {Id = 4, Title="Titolo 4", Body="Testo del quarto rss", Date=new DateTime(2008,1,4), Category=".Net"},
        };

      // Categorie
      var categories = new[] {
        ".Net", "C#" };

      using (var writer = XmlWriter.Create(Response.OutputStream))
      {
        // Creo il feed impostanto le proprietà di base
        var feed = new SyndicationFeed("AZ", "Testo descrittivo rss", new Uri("http://AZ.AZ"));

        // Aggiungo l'autore
        feed.Authors.Add(new SyndicationPerson("andrew@aspitalia.com", "AZ",  "http://ciclismo.sitiasp.it"));

        // Aggiungo categorie al feed
        foreach (var category in categories) feed.Categories.Add(new SyndicationCategory(category));
        
        // Copyright
        feed.Copyright = new TextSyndicationContent("© AZ for AspItalia.com");

        // chi ha generato
        feed.Generator = "AZ";

        // Culture utilizzata
        feed.Language = "it-IT";

        // Aggiungo ogni feed alla collection
        List<SyndicationItem> items = new List<SyndicationItem>();
        foreach (var singleFeed in feeds)
        {
          var item = new SyndicationItem();
          item.Id = singleFeed.Id.ToString();
          item.Title = TextSyndicationContent.CreatePlaintextContent(singleFeed.Title);
          item.Content = SyndicationContent.CreateXhtmlContent(singleFeed.Body);
          item.PublishDate = singleFeed.Date;
          item.Categories.Add(new SyndicationCategory(singleFeed.Category));
          // Link di ogni singolo post 
          item.AddPermalink(new Uri("http://www.sito.xx/pagina.aspx?id=" + singleFeed.Id));
          items.Add(item);
        }

        feed.Items = items;

        Response.Clear();
        Response.ContentType = "application/xml";

        // Scrive feed!

        // Con Atom, decommentare questo codice per utilizzare ATOM
        //var atomFormatter = new Atom10FeedFormatter(feed);
        //atomFormatter.WriteTo(writer);

        // Con Rss 2, commentare questo codice per usare ATOM
        var rssFormatter = new Rss20FeedFormatter(feed);
        rssFormatter.WriteTo(writer);
      }
      Response.End();
    }
  }
}