ASP.NET XML Feed Error

kwilliams · January 11th, 2010, 05:57 PM

I have an ASP.NET page that parses an external XML feed (please see example code below). It works...but when the feed goes down, it subsequently brings my site down. So I've created a default XML document that's located on my internal server a backup method when/if the external feed goes down. But I have no idea how to do this. If someone could let me know how to accomplish this, or point me in the right direction, that would be great. Thanks in advance.

ASP.NET XML FEED CODE

Code:

Dim intSWACounter As Integer = 0
        Dim swa_xmld As New XmlDocument() 'Create the XML Document
        Dim swa_nodelist As XmlNodeList
        Dim swa_node As XmlNode
        Dim objShowWeatherAlert As Object = False
        
        'Check for active severe weather alerts
        Try
            'Load the Xml file
            swa_xmld.Load("http://www.weather.gov/alerts-beta/wwaatmget.php?x=COC035") 'LIVE: Example feed
        Catch
            'What to do when it encounters an error
            swa_xmld.Load(MapPath("/mysite/docs/xml/weatheralert_down.xml")) 'DOWN
        Finally
            'Include code to run, no matter whether the code throws an exception or whether it runs successfully
            'Get the list of name nodes
            Dim xnm As New XmlNamespaceManager(swa_xmld.NameTable)
            xnm.AddNamespace("atom", "http://www.w3.org/2005/Atom")
            swa_nodelist = swa_xmld.SelectNodes("/rss/channel/item[title != 'There are no active watches, warnings or advisories in Colorado (Douglas/COC035)']", xnm) 'LIVE
        End Try