public void AddFeed(Feed addfeed)
{
using (RssEntities addcontext = new RssEntities())
{
try
{
addcontext.Feeds.AddObject(addfeed);
addcontext.SaveChanges();
}
catch (Exception e)
{
string msg = e.Message;
string reason = "AddFeed Feeds.AddObject Exception";
throw new FaultException<DBRequestFault>
(new DBRequestFault(msg), reason);
}
try
{
List<News> feedNews = LoadNewsFromFeed(addfeed);
foreach (News item in feedNews)
{
addcontext.News.AddObject(item);
}
addcontext.SaveChanges();
}
catch (Exception e)
{
string msg = e.Message;
string reason = "AddFeed News.AddObjectt Exception";
throw new FaultException<DBRequestFault>
(new DBRequestFault(msg), reason);
}
}
}
public void AddFeed(string name, string url)
{
Feed newFeed = new Feed
{
ID = Guid.NewGuid(),
Name = name,
URL = url
};
try
{
context.Feeds.AddObject(newFeed);
context.SaveChanges();
}
catch (Exception e)
{
string msg = e.Message;
string reason = "AddFeed Feeds.AddObject Exception";
throw new FaultException<DBRequestFault>
(new DBRequestFault(msg), reason);
}
try
{
List<News> feedNews = LoadNewsFromFeed(newFeed);
foreach (News item in feedNews)
{
context.News.AddObject(item);
}
context.SaveChanges();
}
catch (Exception e)
{
string msg = e.Message;
string reason = "AddFeed News.AddObjectt Exception";
throw new FaultException<DBRequestFault>
(new DBRequestFault(msg), reason);
}
}
private void UpdateFeed(Feed feed)
{
try
{
using (XmlReader reader = XmlReader.Create(feed.URL))
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(reader);
//compare the item.LastbuildDate
int result = DateTime.Compare(feed.LastTimeUpdate, GetLastBuildDate(xmlDoc));
if (result < 0 || feed.News.Count == 0)
{
using (RssEntities localContext = new RssEntities())
{
Feed delFeed = localContext.Feeds.First(f => f.ID == feed.ID);
localContext.Feeds.DeleteObject(delFeed);
localContext.SaveChanges();
using (RssEntities addContext = new RssEntities())
{
Feed addfeed = new Feed
{
ID = feed.ID,
Name = feed.Name,
URL = feed.URL
};
addContext.Feeds.AddObject(addfeed);
addContext.SaveChanges();
List<News> feedNews = LoadNewsFromFeed(addfeed);
foreach (News item in feedNews)
{
addContext.News.AddObject(item);
}
addContext.SaveChanges();
}
}
}
}
}
catch (FileNotFoundException fnfEx)
{
string msg = fnfEx.Message;
string reason = "UpdateFeed FileNotFoundException";
throw new FaultException<DBRequestFault>
(new DBRequestFault(msg), reason);
}
catch (Exception ex)
{
string msg = ex.Message;
string reason = "UpdateFeed Exception";
throw new FaultException<DBRequestFault>
(new DBRequestFault(msg), reason);
}
}
private List<News> LoadNewsFromFeed(Feed feed)
{
try
{
if (String.IsNullOrEmpty(feed.URL))
{
throw new ArgumentException("You must provide a feed URL");
}
//start the parsing process
using (XmlReader reader = XmlReader.Create(feed.URL))
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(reader);
feed.LastTimeUpdate = GetLastBuildDate(xmlDoc);
//parse the item
List<News> news = ParseRssNewsItems(xmlDoc);
news.ForEach(el =>
{
el.FeedId = feed.ID;
});
return news;
}
}
catch (ArgumentException argEx)
{
string msg = argEx.Message;
string reason = "LoadNewsFromFeed ArgumentException";
throw new FaultException<DBRequestFault>
(new DBRequestFault(msg), reason);
}
}
/// <summary>
/// Создание нового объекта Feed.
/// </summary>
/// <param name="id">Исходное значение свойства ID.</param>
/// <param name="name">Исходное значение свойства Name.</param>
/// <param name="uRL">Исходное значение свойства URL.</param>
/// <param name="lastTimeUpdate">Исходное значение свойства LastTimeUpdate.</param>
public static Feed CreateFeeds(global::System.Guid id, global::System.String name, global::System.String uRL, global::System.DateTime lastTimeUpdate)
{
Feed feeds = new Feed();
feeds.ID = id;
feeds.Name = name;
feeds.URL = uRL;
feeds.LastTimeUpdate = lastTimeUpdate;
return feeds;
}
/// <summary>
/// Устаревший метод для добавления новых объектов в набор EntitySet Feed. Взамен можно использовать метод .Add связанного свойства ObjectSet<T>.
/// </summary>
public void AddToFeeds(Feed feeds)
{
base.AddObject("Feeds", feeds);
}
