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Re: Evaluate xpath sum() function with msxml

From: "Dimitre Novatchev" <dnovatchev@-----.--->
To: NULL
Date: 3/3/2005 6:20:00 AM
"Xerox" <anon@a...> wrote in message 
news:uykVfSxHFHA.2648@T......
> Can I not execute the xpath without a stylesheet?
>
> I want something like this: totalPrice = XMLDocument.Evaluate
> ("sum(//item/@price)")
>
No, there's no method to evaluate an XPath expression that evaluates to a 
scalar (something that is not a node-set).

Using the transformNode() method is what is used inside the XPath Visualizer 
to obtain the result of evaluating any such XPath expression. It first 
catches the failure of selectNodes(), then it analyses the error message to 
determine that this is not another type of error, then finally, if the error 
message is for trying to evaluate an XPath expression returning a scalar, it 
invokes transformNode() with a dynamically modified (to have the particular 
XPath expression as the value of an "select" attribute) generic stylesheet 
that produces the result of evaluating the XPath expression.


Cheers,
Dimitre Novatchev.


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