/// <summary>
/// self writing rss-parse
/// only compatible with rss 2.0
/// instance : laozhao's blog
/// </summary>
/// <param name="rssSourceUri"></param>
/// <returns></returns>
private async Task<RssSource> ForgeRssSource(Uri rssSourceUri)
{
HttpClient client = new HttpClient();
Stream stream = await client.GetStreamAsync(rssSourceUri);
XDocument doc = XDocument.Load(stream);
var channel = doc.Root.Element("channel");
string rssTitle = ForgeHelper.GetElementValueOrDefault(channel, "title");
string rssLink = ForgeHelper.GetElementValueOrDefault(channel, "link");
string rssDescription = ForgeHelper.GetElementValueOrDefault(channel, "description");
string rssEditor = ForgeHelper.GetElementValueOrDefault(channel, "webMaster");
string rssUpdateString = ForgeHelper.GetElementValueOrDefault(channel, "lastBuildDate");
DateTime rssUpdate;
if (string.IsNullOrEmpty(rssUpdateString)
|| DateTime.TryParse(rssUpdateString, out rssUpdate))
{
rssUpdate = DateTime.MinValue;
}
RssSource source = new RssSource(
rssSourceUri.ToString(),
rssTitle,
rssLink,
rssDescription);
var items = from rssItem in channel.Descendants("item")
select new RssItem(
ForgeHelper.GetElementValueOrDefault(rssItem, "link"),
source,
ForgeHelper.GetElementValueOrDefault(rssItem, "title"),
ForgeHelper.GetElementValueOrDefault(rssItem, "pubDate"),
String.Join(",", rssItem.Descendants("category").Select(x => x.Value)),
ForgeHelper.GetElementValueOrDefault(rssItem, "description"));
foreach (var item in items)
{
source.AddItem(item);
}
return source;
}
/// <summary>
/// using Windows.Web.Syndication
/// </summary>
/// <param name="feedUriString"></param>
/// <returns></returns>
private async Task<RssSource> ForgeRssSource(string feedUriString)
{
AddSourceProgressRing.IsActive = true;
Windows.Web.Syndication.SyndicationClient client = new SyndicationClient();
Uri feedUri = new Uri(feedUriString);
try
{
SyndicationFeed feed = await client.RetrieveFeedAsync(feedUri);
// This code is executed after RetrieveFeedAsync returns the SyndicationFeed.
// Process the feed and copy the data you want into the FeedData and FeedItem classes.
RssSource feedData = new RssSource(feedUri.ToString());
if (feed.Title != null && feed.Title.Text != null)
{
feedData.Title = feed.Title.Text;
}
if (feed.Subtitle != null && feed.Subtitle.Text != null)
{
feedData.Description = feed.Subtitle.Text;
}
if (feed.Items != null && feed.Items.Count > 0)
{
// Use the date of the latest post as the last updated date.
feedData.LastBuildTime = feed.Items[0].PublishedDate.DateTime;
feedData.CreateTime = feed.LastUpdatedTime.UtcDateTime;
foreach (SyndicationItem item in feed.Items)
{
RssItem feedItem = null;
// Handle the differences between RSS and Atom feeds.
if (feed.SourceFormat == SyndicationFormat.Atom10)
{
if (item.Id != null)
{
feedItem = new RssItem(item.Id, feedData);
feedItem.Link = new Uri(item.Id);
}
if (item.Content != null && item.Content.Text != null)
{
feedItem.Content = item.Content.Text;
}
}
else if (feed.SourceFormat == SyndicationFormat.Rss20)
{
if (item.Links != null && item.Links.Count > 0)
{
feedItem = new RssItem(item.Links[0].Uri.ToString(), feedData);
feedItem.Link = item.Links[0].Uri;
}
if (item.Summary != null && item.Summary.Text != null)
{
feedItem.Content = item.Summary.Text;
}
}
if (item.Title != null && item.Title.Text != null)
{
feedItem.Title = item.Title.Text;
}
if (item.PublishedDate != null)
{
feedItem.CreateTime = item.PublishedDate.DateTime;
}
if (item.Authors != null && item.Authors.Count > 0)
{
feedItem.Author = item.Authors[0].Name.ToString();
}
feedData.AddItem(feedItem);
}
}
AddSourceProgressRing.IsActive = false;
return feedData;
}
catch (Exception)
{
AddSourceProgressRing.IsActive = false;
return null;
}
}