在 XML 中选择节点 [英] Selecting nodes in XML

问题描述

我正在尝试在 c# 中使用 xpath 选择节点

I'm trying to select nodes using xpath in c#

这是我的 XML 文件

This is my XML file

<?xml version="1.0" encoding="ISO-8859-1"?>
<rss version="2.0">
    <channel>
        <title>Some other title</title>
        <item>
            <description><![CDATA[<img src="http://www.site.com/image.jps"/><br />]]></description>

        </item>
        <item>
            <title>This title</title>
            <subtitle><subtitle>
            <Date>Fri, 21 Mar 2014 08:30:44 GMT</Date>
            <description>Some description</description>
        </item>
        <item>
            <title>The other title</title>
            <subtitle><subtitle>
            <Date>Fri, 21 Mar 2014 08:30:44 GMT</Date>
            <description>The other description</description>
        </item>
    </channel>
</rss>

到目前为止，这是我的错误代码:

This is my incorrect code so far:

            // Load the document and set the root element.
            XmlDocument doc = new XmlDocument();
            doc.Load("file.xml");

            // Select nodes
            XmlNode root = doc.DocumentElement;
            XmlNodeList nodeList = root.SelectNodes("/channel/item/");

            foreach (XmlNode xn in nodeList)
            {
                string fieldLine = xn["Title"].InnerText;
                Console.WriteLine("Title: ", fieldLine);
            }

我想像这样从item"输出title":

What I want to output the "title" from "item" like this:

This title
The other title

如果你知道怎么做，请告诉我

Please let me know if you know how to do this

推荐答案

我建议你使用 Linq to Xml:

var xdoc = XDocument.Load("file.xml");
var titles = from i in xdoc.Root.Element("channel").Elements("item")
             select (string)i.Element("title");

或者使用 XPath:

Or with XPath:

var titles = xdoc.XPathSelectElements("rss/channel/item/title")
                 .Select(t => (string)t);

返回带有标题的 IEnumerable.

foreach (string title in titles)
    Console.WriteLine("Title: {0}", title); // note item placeholder in format

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