如何消除某些祖先元素？

Question

I'm trying to set the value of all "CSS" elements "value" to "", here is the code:

XDocument doc = XDocument.Load(fi.FullName);
XNamespace rep = "http://developer.cognos.com/schemas/report/8.0/";

List<XElement> cssElements =
    (from e in doc.Root.DescendantsAndSelf(rep + "CSS")
     where
     (
         (e.Attribute("value") != null)
     )
     select e).ToList();

//modify Attribute in elements
foreach (XElement xe in cssElements)
{
    xe.Attribute("value").Value = "";
}

But, I don't want to modify this one CSS, which has as ancestors "crosstab" and "style" (xml below):

<crosstab name="Crosstab1" refQuery="Query1">
<crosstabSuppress type="rows"/>
<style>
    <CSS value="border-collapse:collapse;font-family:'Times New Roman'"/>  

how can I do that? Thanks!

Answer 1

If I understood you correctly, maybe something like this:

...

List<XElement> cssElements =
    (from e in doc.Root.DescendantsAndSelf(rep + "CSS")
        where
        (
            (e.Attribute("value") != null) && !(e.Ancestors(rep + "style").Any() && e.Ancestors(rep + "crosstab").Any())
        )
        select e).ToList();

...

I only added this to your where -clause:

&& !(e.Ancestors(rep + "style").Any() && e.Ancestors(rep + "crosstab").Any())