public static DateTime ParseRfc3339DateTime(string value)
{
//------------------------------------------------------------
// Local members
//------------------------------------------------------------
DateTime result = DateTime.MinValue;
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
if (value == null || value.Length == 0)
{
return(result);
}
//------------------------------------------------------------
// Parse RFC-3339 formatted date
//------------------------------------------------------------
if (RSSDateTimeUtility.TryParseRfc3339DateTime(value, out result))
{
return(result);
}
else
{
throw new FormatException(String.Format(null, "'{0}' is not a valid RFC-3339 formatted date-time value.", value));
}
}
public static bool TryParseRfc822DateTime(string value, out DateTime result)
{
//------------------------------------------------------------
// Local members
//------------------------------------------------------------
DateTimeFormatInfo dateTimeFormat = CultureInfo.InvariantCulture.DateTimeFormat;
string[] formats = new string[3];
//------------------------------------------------------------
// Define valid RFC-822 formats
//------------------------------------------------------------
formats[0] = dateTimeFormat.RFC1123Pattern;
formats[1] = "ddd',' d MMM yyyy HH:mm:ss zzz";
formats[2] = "ddd',' dd MMM yyyy HH:mm:ss zzz";
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
if (String.IsNullOrEmpty(value))
{
result = DateTime.MinValue;
return(false);
}
//------------------------------------------------------------
// Perform conversion of RFC-822 formatted date-time string
//------------------------------------------------------------
return(DateTime.TryParseExact(RSSDateTimeUtility.ReplaceRfc822TimeZoneWithOffset(value), formats, dateTimeFormat, DateTimeStyles.None, out result));
}
private static List <NewsFeedItem> ParseFeed(string rss)
{
var list = new List <NewsFeedItem>();
try
{
var xdoc = XDocument.Parse(rss);
var items = xdoc.Descendants("item");
var id = 0;
foreach (var item in items)
{
NewsFeedItem article = new NewsFeedItem();
// Fri, 04 May 2018 15:31:44 EDT <-- district version
// Wed, 02 May 2018 12:58:20 -0000 <-- RSS aggregator version
string dateString = item.Element("pubDate").Value;
DateTime pubDate = DateTime.MinValue;
RSSDateTimeUtility.TryParseRfc822DateTime(dateString, out pubDate);
if (pubDate == DateTime.MinValue)
{
RSSDateTimeUtility.TryParseRfc3339DateTime(dateString, out pubDate);
}
article.Author = "";
article.Title = item.Element("title") != null?item.Element("title").Value : "";
article.Description = item.Element("description") != null?item.Element("description").Value : "";
article.Link = item.Element("link") != null?item.Element("link").Value : "";
article.PublishDate = item.Element("pubDate") != null ? pubDate : DateTime.MinValue;
article.Id = (id++).ToString();
list.Add(article);
}
}
catch { }
return(list);
}
