returning an empty XmlNode

[NevG]

Hi Gang

I have a method that returns an XmlNode. Unless certain criteria are met in which case there is no node to return.

How can I force a returned NULL or an empty XmlNode (how do I create one of these)

Any help as quickly as possible woud be very appreciated....

Cheers

Nev G

 

[chiph]

Just set the variable of type XmlNode to null prior to returning. This is a "ref" variable, right?

  public void MyMethod(ref XmlNode MyNode)
  {
    MyNode = null;
  }

And to call it:

  XmlNode node;

  MyClass.MyMethod(ref node);

  if (null == node)
  {
    // returned nothing
  } else {
    // Got a node, do something with it
  }

Chip H.


If you want to get the best response to a question, please check out FAQ222-2244 first

 

[obislavu]

private XmlNode MyFindUser()
{
try
{
XmlDocument doc = new XmlDocument(); // Here doc could be null or not null
doc.Load("users.xml"// If doc is null then goes in catch{}
XmlNode user; // Here user is null
XmlNode root = doc.DocumentElement; // Here we are sure the doc is not null but root could be null or not
user=root.SelectSingleNode("domain::user[identity/lastname='Doppo']" // If root is null then goes in catch{}
if (user != null)
{
// node found
}
else
{
// node not found
}

}
catch (Excweption ex)
{
string sMsg = "Error loading users.xml file : " + ex.GetType() + ex.Message;
throw new Excepetion (sMsg);
}
return user;
}
How to make a XmlNode null ? Just declare it and assign null to it.

XmlNode node = null;
-obislavu-