I think this should be close
Facebook.FacebookClient fb = new Facebook.FacebookClient(longlifeaccess_token);
Facebook.JsonObject feFeed = (Facebook.JsonObject)fb.Get("me/feed");
Facebook.JsonArray feFeedData = (Facebook.JsonArray)feFeed["data"];
foreach (Facebook.JsonObject item in feFeedData)
{
IDictionary<string, object> post = (IDictionary<string, object>)item;
... ...