XML how to check if node is returning null?

Question

i have this code in c#

doc.SelectSingleNode("WhoisRecord/registrant/email").InnerText

how can i check whether it is returning null?

user166390 · Accepted Answer · 2010-04-15 04:38:08Z

9

var n = doc.SelectSingleNode("WhoisRecord/registrant/email");
if (n != null) { // here is the check
  DoSomething(n.InnerText);
}

answered Apr 15, 2010 at 4:38

user166390

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Comments

Fitzchak Yitzchaki · Accepted Answer · 2010-04-15 04:48:00Z

3

By null do you mean that the element doesn't exist?

try
{
    var n = doc.SelectSingleNode("WhoisRecord/registrant/email");
    if (n == string.Empty) {
        // empty value
    }

    // has value
    DoSomething(n.InnerText);
}
catch (XPathException)
{
    // null value.
    throw;
}

I don't sure that it is correct, I need to test it.

edited Apr 15, 2010 at 4:48

answered Apr 15, 2010 at 4:40

Fitzchak Yitzchaki

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1 Comment

user166390 Over a year ago

Surprise! Assuming doc is an XmlDocument, there isn't one here :-/

Warty · Accepted Answer · 2010-04-15 04:38:48Z

2

//assuming xd is a System.XML.XMLDocument...
XMLNode node = xd.SelectSingleNode("XPath");
if(node == null)
{
 //Your error handling goes here?
}else{
 // manipulate node.innerText 
}

answered Apr 15, 2010 at 4:38

Warty

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Comments

EMP · Accepted Answer · 2010-04-15 04:38:27Z

0

Erm... with the != operator - != null? I'm not sure exactly what you're asking.

answered Apr 15, 2010 at 4:38

EMP

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