public Tuple <FeedType, string> DetectFeedType()
{
var retrieveResult = RetrieveFeed();
if (retrieveResult.Item1 != FeedReadResult.Success)
{
return(new Tuple <FeedType, string>(FeedType.Unknown, string.Empty));
}
return(new Tuple <FeedType, string>(FeedParserBase.DetectFeedType(retrieveResult.Item2), retrieveResult.Item2));
}
private FeedReadResult ReadFeed(FeedCenterEntities database, bool forceRead)
{
try
{
// If not enabled then do nothing
if (!Enabled)
{
return(FeedReadResult.NotEnabled);
}
// Check if we're forcing a read
if (!forceRead)
{
// Figure out how long since we last checked
var timeSpan = DateTime.Now - LastChecked;
// Check if we are due to read the feed
if (timeSpan.TotalMinutes < CheckInterval)
{
return(FeedReadResult.NotDue);
}
}
// We're checking it now so update the time
LastChecked = DateTime.Now;
// Read the feed text
var retrieveResult = RetrieveFeed();
// Get the information out of the async result
var result = retrieveResult.Item1;
var feedText = retrieveResult.Item2;
// If we didn't successfully retrieve the feed then stop
if (result != FeedReadResult.Success)
{
return(result);
}
// Create a new RSS parser
var feedParser = FeedParserBase.CreateFeedParser(this, feedText);
// Parse the feed
result = feedParser.ParseFeed(feedText);
// If we didn't successfully parse the feed then stop
if (result != FeedReadResult.Success)
{
return(result);
}
// Create the removed items list - if an item wasn't seen during this check then remove it
var removedItems = Items.Where(testItem => testItem.LastFound != LastChecked).ToList();
// If items were removed the feed was updated
if (removedItems.Count > 0)
{
LastUpdated = DateTime.Now;
}
// Loop over the items to be removed
foreach (var itemToRemove in removedItems)
{
// Delete the item from the database
database.FeedItems.Remove(itemToRemove);
// Remove the item from the list
Items.Remove(itemToRemove);
}
// Process actions on this feed
ProcessActions();
return(FeedReadResult.Success);
}
catch (InvalidFeedFormatException exception)
{
Tracer.WriteException(exception.InnerException);
return(FeedReadResult.InvalidXml);
}
catch (Exception exception)
{
Tracer.WriteLine(exception.Message);
return(FeedReadResult.UnknownError);
}
}
