Extracting Image Link from a rss feed on windows phone - windows-phone-7.1

Question

I have a question.
How can I extract an url from an rss-feed?
The string which I need to extract is something like this:
><img style="background-image: none; padding-left: 0px; padding-right: 0px; display: inline; padding-top: 0px; border: 0px;" title="screen2" src="http://hereisthelink/screen2.png" alt="screen2" width="261" height="434" border="0" />
This is on the rss feed of my self hostet wordpress-blog, within the <content:encoded> section.
I want to fetch the first Image of an entry to get it together with the title (this works) in my ListBox.
However I tried many things to achieve this, but nothing works.
I am working with the Syndication.dll of Silverlight 3 to extract the feed items.
At the moment I am standing really in front of a wall for this to solve.
I am open to any suggestions.

Answer 1

You can use HTML Agility pack http://htmlagilitypack.codeplex.com/ There's a version for Windows Phone (HAPPhone in the trunk). After getting a Document from the content of the post you can get the first img element child of them.
var firstimage = document.DocumentNode.Descendants("img").FirstOrDefault();

Answer 2

Something like this should work for you:
var document = XDocument.Parse(html);
var items = new List<Item>();
var channel = (XContainer) document.Root.FirstNode;
foreach (XElement item in channel.Nodes())
{
try
{
var item = new Item();
var nodes = item.Nodes().ToArray();
foreach (XElement keyValue in nodes)
{
var value = keyValue.Value.Trim('\r', '\t', '\n', ' ').ToLower();
switch (keyValue.Name.LocalName)
{
case "title": item.Title = value; break;
case "content:encoded": item.Content = value; break;
// TODO: add more fields
}
}
var match = Regex.Match(item.Content, "<img(.*?) src=\"(.*?)\"[^>]*>");
item.FirstImageUrl = match.Groups[2].Value;
}
catch
{
// TODO: handle exception
}
}
return items;
You only have to finish the switch statement and create the Item class.