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RSS Feed Helper Class

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  9 years ago

  by Developer Fusion Bot

  Developer Fusion Bot

  , United Kingdom

  Joined 2 years ago

  This thread is for discussions of RSS Feed Helper Class.

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  4 years ago

  by Thushan Fernando

  Thushan Fernando

  Australia :: Melbourne, Australia

  Joined 7 years ago

  Very nice wrapper
  

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• • Reply

  4 years ago

  by shesta

  shesta

  , United States

  Joined 4 years ago

  thanks for this it helped a lot!  Here's a simple pruning function which would remove past ttl items from the rss feed once its up.  NOTE: i don't correct for time zones if specified at the end of <pubDate>, though you easily could in the for loop.
  

  
  

  Code:

  
  /// <summary>
     /// Attempts to remove items past their time to live value by opening the RSS feed as an xml document and remove the elements with expired ttl
     /// </summary>
     /// <param name="XmlFileStream">a System.IO.Stream of the feed xml</param>
     /// <returns>updated document as System.IO.Stream</returns>
     public System.IO.Stream PrunePastTtl_getStream(System.IO.Stream XmlFeed)
     {
         XmlDocument        feedDoc    = new XmlDocument();
         XmlNode            docfrag;
         XmlNodeList        nodelist;
         int                prunettl;
  

  
         DateTime        TargetPruneDt;
         TimeSpan        ttlTime;
  

  
         try
         {
             feedDoc.Load(XmlFeed);
  

  
             nodelist = feedDoc.GetElementsByTagName("channel");            
             docfrag = nodelist.Item(0);
  

  
             
             string ttlstring = docfrag.InnerXml;
  

  
             int begin = ttlstring.IndexOf("<ttl>") + 5;
             int end = ttlstring.IndexOf(@"</ttl>");
  

  
             ttlstring = ttlstring.Substring(begin,(end - begin));
  

  
             
             prunettl = Convert.ToInt32(ttlstring);
             ttlTime = new TimeSpan(prunettl,0,0,0);
             
             TargetPruneDt = DateTime.Now.Subtract(ttlTime);
  

  
             // at this point should know the ttl so process <item>s
         
             for(int i=0; i< docfrag.ChildNodes.Count; i++)
             {
                 if(docfrag.ChildNodes.Item(i).Name == "item")
                 {
  

  
                     string blobOXml = docfrag.ChildNodes.Item(i).InnerXml;
                     int pubbegin = blobOXml.IndexOf("<pubDate>") + 9;
                     int pubend = blobOXml.IndexOf("</pubDate>");
                 
                     string pubdate = blobOXml.Substring(pubbegin,(pubend - pubbegin));
                 
                     if(pubdate.IndexOf("+") != -1)
                     {
                         pubdate = pubdate.Remove(pubdate.IndexOf("+"),(pubdate.Length - pubdate.IndexOf("+")));
                     }
                     else if(pubdate.IndexOf("-") != -1)
                     {
                         pubdate = pubdate.Remove(pubdate.IndexOf("-"),(pubdate.Length - pubdate.IndexOf("-")));
                     }
  

  
                     DateTime publishDate = DateTime.Parse(pubdate);
  

  
                     if(publishDate.Ticks < TargetPruneDt.Ticks)
                     {
                         docfrag.RemoveChild(docfrag.ChildNodes.Item(i));
                         i--;  // if we remove one dont want to skip one as we iterate through
                     }
                 }
             }
         
             System.IO.Stream returnval = new System.IO.MemoryStream();
             feedDoc.Save(returnval);
             returnval.Position = 0;
  

  
                     return returnval;
         }
         catch(Exception appEx)
         {
             Exception AppEx = new ApplicationException("Unable to load correctly - " + appEx.Message,appEx);
             throw AppEx;
         }
  

  
     }
  

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• • Reply

  1 year ago

  by sandoftime

  sandoftime

  , Thailand

  Joined 1 year ago

  When I run the sample, I got this error :

   

  The XML page cannot be displayed

  Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later.

  ---

  Cannot have a DOCTYPE declaration outside of a prolog. Error processing resource 'http://localhost/TestLibrary/Default.aspx...

  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
  ----------^

   

   

  Please anyone advise me to solve the problem, thanks in advance.

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