How to get the large picture from feed with graph api?

Question

When loading the Facebook feeds from one page, if a picture exist in the feed, I want to display the large picture.

How can I get with the graph API ? T

Answer 1

After positive comment from @Lachezar Todorov I decided to post my current approach (including paging and using Json.NET ;):

try
{
    FacebookClient fbClient = new FacebookClient(HttpContext.Current.Session[SessionFacebookAccessToken].ToString());

    JObject posts = JObject.Parse(fbClient.Get(String.Format("/{0}/posts?fields=message,picture,link,attachments", FacebookPageId)).ToString());
    JArray newsItems = (JArray)posts["data"];

    List result = new List();

    while (newsItems.Count > 0)
    {
        result.AddRange(GetItemsFromJsonData(newsItems));

        if (result.Count > MaxNewsItems)
        {
            result.RemoveRange(MaxNewsItems, result.Count - MaxNewsItems);
            break;
        }

        JToken paging = posts["paging"];

        if (paging != null)
        {
            if (paging["next"] != null)
            {
                posts = JObject.Parse(fbClient.Get(paging.Value("next")).ToString());
                newsItems = (JArray)posts["data"];
            }
        }
    }

    return result;
}

And the helper method to retieve individual items:

private static IEnumerable GetItemsFromJsonData(IEnumerable items)
{
    List newsItems = new List();

    foreach (JToken item in items.Where(item => item["message"] != null))
    {
        NewsItem ni = new NewsItem
        {
            Message = item.Value("message"),
            DateTimeCreation = item.Value("created_time"),
            Link = item.Value("link"),
            Thumbnail = item.Value("picture"),

            // http://stackoverflow.com/questions/28319242/simplify-looking-up-nested-json-values-with-json-net/28359155#28359155
            Image = (String)item.SelectToken("attachments.data[0].media.image.src") ?? (String)item.SelectToken("attachments.data[0].subattachments.data[0].media.image.src")
        };
        newsItems.Add(ni);
    }

    return newsItems;

}

NewsItem class I use:

public class NewsItem
{
  public String Message { get; set; }
  public DateTime? DateTimeCreation { get; set; }
  public String Link { get; set; }
  public String Thumbnail { get; set; }
  public String Image { get; set; }
}