Linq to XML-选择多个元素

Question

I have one xml file with a collection of cars. I want to remove a element A and B if the car is green :

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<Cars>
    <Car>
        <Color>Green</Color>
        <A>Value</A>
        <B>Value</B>
    </Car>
    <Car>
        <Color>Blue</Color>
        <A>Value</A>
        <B>Value</B>
    </Car>
    <Car>
        <Color>Yellow</Color>
        <A>Value</A>
        <B>Value</B>
    </Car>
</Cars>

I do :

XDocument.Root.Descendants("Car").Where(x => x.Element("Color").Value == "Green"). Select(x => x.Element("A")).Remove();

XDocument.Root.Descendants("Car").Where(x => x.Element("Color").Value == "Green"). Select(x => x.Element("B")).Remove();

It's work but how to do this in one line ? How to select two elements in Select ?

Thank's

Answer 1

This is one possible way, find Color element where value equals 'Green', grab all the following sibling elements using ElementsAfterSelf() , flatten them using SelectMany() , and finally remove them :

XDocument.Root
         .Descendants("Car")
         .Elements("Color")
         .Where(c => c.Value == "Green")
         .SelectMany(c => c.ElementsAfterSelf())
         .Remove();

UPDATE :

If the target elements strictly need to be identified by name eg not necessarily all elements after <Color> , you can use Where() method as follow :

XDocument.Root
         .Descendants("Car")
         .Where(c => (string)c.Element("Color") == "Green")
         .SelectMany(c => c.Elements()
                           .Where(e => e.Name.LocalName == "A" ||
                                       e.Name.LocalName == "B"))
         .Remove();

If list of target element names may grow to more than 2 ("A" and "B"), I'd suggest to use array and Contains() for filtering :

var targetElementNames = new[]{ "A", "B", "C" };
XDocument.Root
         .Descendants("Car")
         .Where(c => (string)c.Element("Color") == "Green")
         .SelectMany(c => c.Elements()
                           .Where(e => targetElementNames.Contains(e.Name.LocalName))
         .Remove();