Find values under one node in XML

问题

Below is xml file format from which words to be searched.

<Book>
<Page id="1">
<Head>Preface</Head>
<Body>
<Paragraph>
    <Line>
        <Word>
            <Char>T</Char>
            <Char>h</Char>
            <Char>i</Char>
            <Char>s</Char>
        </Word>
        <Word>
            <Char>-</Char>
        </Word>
        <Word>
            <Char>i</Char>
            <Char>s</Char>
        </Word>
        <Word>
            <Char>-</Char>
        </Word>
        <Word>
            <Char>s</Char>
            <Char>a</Char>
            <Char>m</Char>
            <Char>p</Char>
            <Char>l</Char>
            <Char>e</Char>
        </Word>
        <Word>
            <Char>-</Char>
        </Word>
        <Word>
            <Char>t</Char>
            <Char>e</Char>
            <Char>x</Char>
            <Char>t</Char>
        </Word>
    </Line>
</Paragraph>
</Body>
</Page>

I used the below XPath expressions in C# to find values of Char Node.

XmlDocument objXmlDoc = new XmlDocument();
XmlNodeList objXmlNodeList;
objXmlDoc.Load(sFilePath);
objXmlNodeList = objXmlDoc.SelectNodes("//CHAR[translate(text(),'abcdefghijklmnopqrstuvwxyz','ABCDEFGHIJKLMNOPQRSTUVWXYZ')='" + txtFindText.Text.ToUpper() + "']");

Here, how to get a complete word with XPath from above XML File ?

回答1:

It is not possible theoretically. The reason is that XML/XPATH does not ensure order as the result of a query is a "node-set" which by definition is "an unordered collection of nodes without duplicates".

http://www.w3.org/TR/xpath/

Nevertheless, you can get close to the requirement. For example, you can get the first word:

XmlDocument objXmlDoc = new XmlDocument();
XmlNodeList objXmlNodeList;
objXmlDoc.Load(sFilePath);
objXmlNodeList = objXmlDoc.SelectNodes("//Word");
string s = string.Empty;
XmlNodeList wordNodes = objXmlNodeList[0].ChildNodes;
foreach (XmlNode characterNode in wordNodes)
{
   s = s + characterNode.InnerText;
}

回答2:

I would use Linq2Xml

XDocument xDoc = XDocument.Parse(xml); //or XDocument.Load(fileName)
var words = xDoc.Descendants("Word")
                .Select(w => String.Join("",w.Descendants("Char").Select(c => c.Value)))
                .ToList();

--EDIT--

for @Y.Ecarri

var words2 = xDoc.XPathSelectElements("//Word")
                 .Select(w => String.Join("", w.Elements().Select(c => c.Value)))
                 .ToList();

来源：https://stackoverflow.com/questions/12800833/find-values-under-one-node-in-xml

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winforms

visual-studio-2008

xpath