NullRefernceException when adding XElement to a XDocument

Question

I have the following .xml file:

<?xml version="1.0" encoding="utf-8" ?>
<Params>
  <Name>Resolver1</Name>
  <RemoteHosts>
    <Host>
      <Name>Locale</Name>
       <IP>localhost</IP>
       <Port>8082</Port>
     </Host>
  </RemoteHosts>
</Params>

Now, when I try to add another "Host" in the "RemoteHosts" section using the following code it raises a NullReferenceException:

XDocument xmlList = XDocument.Load("NetConfig.xml");

xmlList.Element("RemoteHosts").Add(new XElement("Host",    
new XElement("Name", h.name),
new XElement("IP", h.IP),
new XElement("Port", h.port)));

anyway the

xmlList.Save("NetConfig.xml");

works well, saving the new item...what's wrong?

can you debug to find out what is actually null? Is it the h variable, or maybe the "RemoteHosts" node? Not clear. — ek_ny, Jun 19 '11 at 11:26
Hmm, it doesn't make sense object from which you're calling `Add` is null and the node you're adding is actually added. — Piotr Auguscik, Jun 19 '11 at 11:32

score 1 · Accepted Answer · answered Jun 19 '11 at 11:29

1

XmlList contains only 1 node and its Params not RemoteHosts

answered Jun 19 '11 at 11:29

Piotr Auguscik

3,651
1
22
30

Thank you! Now using xmlList.Element("Params").Element("RemoteHosts").Add ... it works! – Rick Jun 19 '11 at 11:33

score 0 · Answer 2 · answered Jun 19 '11 at 11:32

0

Try xmlList.Root.Element("RemoteHosts")

answered Jun 19 '11 at 11:32

Shurdoof

1,719
13
16

NullRefernceException when adding XElement to a XDocument

2 Answers2