Question

My requirement here is to retrieve the node that matches the hostname (for eg. machine1) and I always get back no results. Please let me know what the problem is?

Thanks for the help in advance!!!

XDocument configXML = XDocument.Load('the below xml');  var q = from s in configXML.Descendants('lcsetting')     where ((string)s.Element('host') == hostName)                             select s; 

The actual xml:

<lcsettings>   <lcsetting env='prod'>     <hosts usagelogpath=''>       <host>machine1</host>       <host>machine2</host>       <host>machine3</host>     </hosts>   </lcsetting>   <lcsetting env='qa'>     <hosts usagelogpath=''>       <host>machine4</host>       <host>machine5</host>       <host>machine6</host>     </hosts>   </lcsetting>   <lcsetting env='test'>     <hosts usagelogpath=''>       <host>machine7</host>       <host>machine8</host>       <host>machine9</host>     </hosts>   </lcsetting> </lcsettings> 

Answer 1

You’re looking for a host element directly under an lcsetting – that doesn’t occur because there’s always a hosts element between the two in the hierarchy. You’re also using Element instead of Elements, which means only the first element with the right name will be returned.

You could use Descendants again instead of Element… but you’ll need to change the condition. Something like:

var q = from s in configXML.Descendants('lcsetting')         where s.Descendants('host').Any(host => host.Value == hostName)         select s; 

Alternatively, you could make your query find host elements and then take the grandparent element in each case:

var q = from host in configXML.Descendants('host')         where host.Value == hostName         select host.Parent.Parent; 

(This assumes a host element will only occur once per lcsetting; if that’s not the case, you can add a call to Distinct.)