.Evaluate xpath statement

[euntair]

I tested /project/pages/page[@completed='n'][not(text())=''] at

http://www.mizar.dk/XPath/Default.aspx

with success but the xpath expression below doesn't work in C#. How do I re-write the xpath statement so I can use .Evaluate to return a empty node-set in C#?

string xpath = "/project/pages/page[@completed='n'][not(text())='']";
bool not_finished = (bool)xd.CreateNavigator().Evaluate(xpath);

<project>
<pages>
<page id="1" completed="y">one</page>
<page id="2" completed="y">two</page>
<page id="3" completed="y">three</page>
<page id="4" completed="y">four</page>
<page id="5" completed="y">five</page>
<page id="6" completed="y">six</page>
</pages>
</project>

 

[tsuji]

To verify empty node set return, you use the Count property exposed by XPathNodeIterator. But if you use Evaluate(), you need to explicitly cast it to it, in contrast to using Select(). And then, the return of Count be integer and you need to further convert it to Boolean. The combined considerations result in the form like this.

>bool not_finished = (bool)xd.CreateNavigator().Evaluate(xpath);
[tt]bool not_finished=Convert.ToBoolean(((XPathNodeIterator)xd.CreateNavigator().Evaluate(xpath)).Count);[/tt]