Get option from specific start position?

问题

I've a select like this:

<select class="foo">
    <option></option>
    <option>item1</option>
    <option>item2</option>
</select>

I need to get only the option that have text inside, so I need to skip the first option and get only Item1 and Item2

what I did

var opts = doc.DocumentNode.SelectNodes("//select[@class='foo']//option");

this will return of course 3 options, how can I do this? Thanks.

回答1:

Working xpath:

"//select[@class='foo']//option[string-length( text()) > 0]"

回答2:

This XPath might work faster as there is no calculation needed:

"//select[@class='foo']//option[text()]"

来源：https://stackoverflow.com/questions/47430495/get-option-from-specific-start-position