private static void SaveNotExistSource(string source, string url)
{
RSSContext db = new RSSContext();
var addingSource = db.RSSSources.FirstOrDefault(s => s.Name == source);
if (addingSource == null)
{
db.RSSSources.Add(new RSSSource()
{
Name = source,
URL = url
});
db.SaveChanges();
}
}
private static List <RSSFeed> GetFeed(string url, string sourceName)
{
SaveNotExistSource(sourceName, url);
RSSContext db = new RSSContext();
var result = new List <RSSFeed>();
XmlReader xmlReader;
var webRequest = HttpWebRequest.Create(url) as HttpWebRequest;
SyndicationFeed feed;
using (var response = (HttpWebResponse)webRequest.GetResponse())
{
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
var stream = new MemoryStream();
var writer = new StreamWriter(stream);
writer.Write(reader.ReadToEnd().TrimStart('\n'));
writer.Flush();
stream.Position = 0;
xmlReader = XmlReader.Create(stream);
feed = SyndicationFeed.Load(xmlReader);
xmlReader.Close();
stream.Close();
}
}
foreach (var item in feed.Items)
{
result.Add(new RSSFeed()
{
Name = item.Title.Text,
PublishDate = item.PublishDate.DateTime,
Description = Regex.Replace(item.Summary.Text, @"<[^>]*>", String.Empty),
URL = item.Id,
RSSSourceId = db.RSSSources.FirstOrDefault(f => f.Name == sourceName).Id
});
}
return(result);
}
private static void SaveNotExistFeeds(string url, string source)
{
var readFeeds = GetFeed(url, source);
List <RSSFeed> saveFeeds = null;
RSSContext db = new RSSContext();
try
{
saveFeeds = db.RSSFeeds.Where(f => f.RSSSource.Name == source).ToList();
foreach (var feed in readFeeds)
{
if (saveFeeds == null || saveFeeds.FirstOrDefault(f => f.Name == feed.Name && f.PublishDate == feed.PublishDate) == null)
{
db.RSSFeeds.Add(feed);
}
}
Console.WriteLine(string.Format("Прочитано {0} новостей из {1}, сохранено {2}", readFeeds.Count, source, db.SaveChanges()));
}
catch (Exception e)
{
Console.WriteLine(string.Format("Ошибка загрузки новостей из {0}", source));
}
}
