Error in executing xpath expression in c#

Question

I have the following code to execute xpath expression:

nodeList = xmlDocument.SelectNodes("if(count(//Claims[ClaimNoticeCd='SUBCLAIM']) > 1)
then //Claims[ClaimNoticeCd='SUBCLAIM']   else //Claims[ClaimNoticeCd='CLAIM']");

But it is giving me xpath exception like:

if(count(//Claims[ClaimNoticeCd='SUBCLAIM']) > 1) then //Claims[ClaimNoticeCd='SUBCLAIM'] else //Claims[ClaimNoticeCd='CLAIM']" has invalid token

Always post example XML, you will receive better answers when doing so. Also read about the SSCCE. Your current query is saying "If there are at least two subclaims in all input, return those, otherwise return all claims". Is this what you want to achieve? As far as I can derive your XML structure from your expression, I'm not too sure about that. And: You should accept answers if they solved your question, read How to Ask. — Jens Erat
– Jens Erat, Commented Jul 12, 2013 at 16:16

Jens Erat · Accepted Answer · 2013-07-12 16:13:33Z

1

In XPath 1.0 there is no if/then/else, but you can fake it using opposing predicates and node set union:

//Claims[count(//Claims[ClaimNoticeCd='SUBCLAIM'])>1][ClaimNoticeCd='SUBCLAIM']
  |
//Claims[count(//Claims[ClaimNoticeCd='SUBCLAIM'])<=1][ClaimNoticeCd='CLAIM']

answered Jul 12, 2013 at 16:13

Jens Erat

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Plymouth223 · Accepted Answer · 2013-07-12 10:34:28Z

0

The statement you're using is XPath 2.0. The .NET framework doesn't support XPath 2.0 and you'll have to rely on 3rd party libraries if you require it.

http://msdn.microsoft.com/en-us/library/ms256471.aspx

answered Jul 12, 2013 at 10:34

Plymouth223

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