Question

i have an xml string and i want to read data from it.

<?xml version="1.0" encoding="utf-16"?>
<Tree AllowNodeEditing="True" ShowLineImages="False" CheckBoxes="True"
      EnableAjaxSkinRendering="False" AutoPostBackOnCheck="True" AutoPostBack="True">
  <Node Enabled="False" Text="Geen afbeeldingen aanwezig" 
        Checked="True" Selected="True" thumb="" tekst="" />
  <Node Text="IMG_2807 (Small).JPG" 
        Value="../../CMS/Images/Fotogalerie/552/IMG_2807 (Small).JPG" tekst="Afbeelding IMG_2807 (Small).JPG" 
        thumb="../../CMS/Images/Thumbs/552/IMG_2807 (Small).JPG" />

please note that in third line Node enabled=False.

I am using the code

 XDocument doc = XDocument.Parse(strFile);
                    var values = (from f in doc.Elements().Descendants()
                                  select f.Attribute("Value").Value).ToArray();

and this throws an error..

Answer 1

You need to null check the value because if you do select f.Attribute("Value").Value without null checking, it will throw an exception if the element doesn’t have the Value attribute.

Looking at your sample XML not all Nodes have the attribute Value.

Try this instead:

var values = (from f in doc.Descendants("Node")
              where f.Attribute("Value") != null
              select f.Attribute("Value").Value).ToArray();