如何解析XML文件

Question

我有一个XML文件,看起来像:

  <results>
    <result>
      <title>Welcome+to+The+JASON+Project%21</title>
      <url>http%3A%2F%2Fwww.jason.org%2F</url>
      <domain />
      <inside_links>
        <inside_link>
          <description>News</description>
          <url>http%3A%2F%2Fwww.jason.org%2FPublic%2FNews%2FNews.aspx</url>
        </inside_link>
        <inside_link>
          <description>register</description>
          <url>http%3A%2F%2Fwww.jason.org%2Fpublic%2Fregistration%2Fregistration.aspx</url>
        </inside_link>
        <inside_link>
          <description>Argonauts</description>
          <url>http%3A%2F%2Fwww.jason.org%2FPublic%2FArgonauts%2FArgonauts.aspx</url>
        </inside_link>
        <inside_link>
          <description>Curriculum</description>
          <url>http%3A%2F%2Fwww.jason.org%2FPublic%2FCurriculum%2FCurriculum.aspx</url>
        </inside_link>
        <inside_link>
          <description>Credits</description>
          <url>http%3A%2F%2Fwww.jason.org%2Fpublic%2FMisc%2FCredits.aspx</url>
        </inside_link>
      </inside_links>
      <inside_keywords>National+Science+Education+Standards, National+Geographic+Society, Physical+Science, Professional+Development, Earth+Science</inside_keywords>
    </result>
  </results>

......我对如何阅读而感到困惑.我只想将标题,描述和URL分成不同的字符串.就像是:

foreach line in lines
string title = gettitle;
string description = getdescription;
string url = geturl;

...我已经阅读了很多教程,但所有这些教程似乎与我需要做的事情无关......有人可以帮我解决这个问题吗？

Answer 1

如果您使用的是.NET 3.5,我建议使用LINQ to XML ...

XDocument doc = XDocument.Load(filename);
XElement insideLinks = doc.Root.Element("result").Element("inside_links");
foreach (XElement insideLink in insideLinks.Elements())
{
    string description = (string)insideLink.Element("description");
    string url = (string)insideLink.Element("url");
}

这也允许你使用内置的"查询"语法,所以你可以做这样的事情......

XDocument doc = XDocument.Load(filename);
XElement insideLinks = doc.Root.Element("result").Element("inside_links");
var allTitles = from XElement insideLink 
                in insideLinks.Elements("inside_link")
                select (string)insideLink.Element("title");

(根据评论编辑)

Answer 2

要扩展LINQ to XML建议,可以使用select子句创建对象以表示已解析的链接:

XDocument doc = XDocument.Load(filename);
var links = from link in doc.Descendants("inside_link")
            select new
            {
                Description = (string)link.Element("description"),
                Url = HttpUtility.UrlDecode((string)link.Element("url"))
            };

foreach(var l in links)
    Console.WriteLine("<a href=\"{0}\">{1}</a>", l.Url, l.Description);

在这种情况下,links将是具有带有Description和Url属性的匿名类型的对象序列,并且Url已解码.这foreach会显示如下:

<a href="http://www.jason.org/Public/News/News.aspx">News</a>
<a href="http://www.jason.org/public/registration/registration.aspx">register</a>
...