如何检查 Rss Feed 链接是否有效

Question

我想检查提供的 Rss feed 链接是否有效以及它现在是否有效？

Answer 1

只需加载 URL 并检查它是否确实是 RSS 提要。

try {
  var feedDoc = XDocument.Load(url);
  return ValidateRss(feedDoc); // implementation left as an exercise for the reader.
}
catch(HttpException) { // perhaps others
  return false;
}

Answer 2

使用下面的代码来检查 RSS URL：

    using System.ServiceModel.Syndication;

    public static bool IsValidFeedUrl(string url)
    {
        bool isValid = true;
        try
        {
            XmlReader reader = XmlReader.Create(url);
            Rss20FeedFormatter formatter = new Rss20FeedFormatter();
            formatter.ReadFrom(reader);
            reader.Close();
        }
        catch
        {
            isValid = false;
        }

        return isValid;
    }