从XDocument中选择XElement

Question

I really didn't want to ask for help as I know I'll eventually figure it out, but I've spent too much time, if the document had parent tags or a better structure, it would be a piece of cake. Sadly I'm downloading the document, and I just can't figure out how to get the data.

I've tried aa few linq queries and a foreach using XElement as an iterator. Anyway here's an example of the structure.

<ResultSet xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:yahoo:srch" xsi:schemaLocation="urn:yahoo:srch http://api.search.yahoo.com/SiteExplorerService/V1/InlinkDataResponse.xsd" totalResultsAvailable="247930100" firstResultPosition="99" totalResultsReturned="100">
 <Result>
  <Title>Adobe - Adobe Reader</Title> 
  <Url>http://get.adobe.com/fr/reader/</Url> 
  <ClickUrl>http://get.adobe.com/fr/reader/</ClickUrl> 
  </Result>
 <Result>
  <Title>Religious Tolerance</Title> 
  <Url>http://www.religioustolerance.org/</Url> 
  <ClickUrl>http://www.religioustolerance.org/</ClickUrl> 
  </Result>
 <Result>
  <Title>Applications Internet riches (RIA) | Adobe Flash Player</Title> 
  <Url>http://www.adobe.com/fr/products/flashplayer/</Url> 
  <ClickUrl>http://www.adobe.com/fr/products/flashplayer/</ClickUrl> 
  </Result>
 <Result>
  <Title>photo management software | Adobe Photoshop Lightroom 3</Title> 
  <Url>http://www.adobe.com/products/photoshoplightroom/</Url> 
  <ClickUrl>http://www.adobe.com/products/photoshoplightroom/</ClickUrl> 
  </Result>
 <Result>
  <Title>Battle for Wesnoth</Title> 
  <Url>http://www.wesnoth.org/</Url> 
  <ClickUrl>http://www.wesnoth.org/</ClickUrl> 
  </Result>
</ResultSet>

Here's an example of a latest snippet.

foreach (XElement ele in xDoc.Descendants("ResultSet").Elements("Result"))
                {
                    CollectedUris.Add(ele.Element("Url").Value);
                }

Answer 1

You'll need to add an XNamespace :

XNamespace ns = "urn:yahoo:srch";

var query = xDoc.Root.Descendants( ns + "Result" ).Elements( ns + "Url" )

foreach( XElement e in query )
{
    CollectedUris.Add( e.Value );
}

Edit :
A LINQ solution for bonus points:

xDoc.Root.Descendants( ns + "Result" )
    .Elements( ns + "Url" )
    .Select( x => x.Value ).ToList()
    .ForEach( CollectedUris.Add );

Answer 2

I'm assuming you want all <Url> elements in the document. If that's the case, then your loop is almost there. You will want to do the following.

using System.Xml.Linq;

foreach (XElement ele in xDoc.Root.Descendants("Result").Descendants("Url")
{
    CollectedUris.Add(ele.Value);
}

Root gets you a reference to the root element, and the following Descendants statement returns only the <Result> nodes. The last Descendants statement further constrains the <Result> node enumerator to only return <Url> elements.