Question

This is my Xml file:

<?xml version="1.0" encoding="utf-8" ?>
<dati>
  <product id="456">
    <item>a</item>
    <item>b</item>
    <item>c</item>
  </product>
  <product id="789">
    <item>a</item>
    <item>b</item>
  </product>
  <product id="533">
    <item>a</item>
  </product>
</dati>

Code below returns only first item.InnerText element

List<string> lst = new List<string>();
XDocument Doc = XDocument.Load("test.xml");

var q = from c in Doc.Descendants("product")
        where c.Attribute("id").Value == "789"
        select c.Element("item");

foreach (string name in q)
       lst.Add(name);

listBox1.DataSource = lst;

how can I have a collection of all items for selected product?

Answer 1

Sure:

var list = Doc.Descendants("product")
              .Single(c => c.Attribute("id").Value == "789")
              .Elements("item")
              .Select(item => (string) item)
              .ToList();

Note that this takes a slightly different approach – it checks that there’s exactly one matching product element (by finding it) and then selects the item elements underneath it, projecting each to its value. It then converts those strings into a list in a rather neater way 🙂