在Xelement中选择Xelement中的值?

时间:2011-08-21 08:49:32

标签: c# xml linq-to-xml

对于Windows Phone中的Webradio应用程序,我正在尝试使用数据读取XML文件,但我遇到了特定字段的问题。 XML文件如下所示:

<brands xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <brandgroup>
        <brand>
            <code>blabla</code>
            <name>blabla</name>
            <logo>blabla</logo>
            <websiteurl>blabla</websiteurl>
            <audiostreams>
                <audiostream streamurl="www.1.mp3" codec="mp3" streamrate="low"/>
                <audiostream streamurl="www.2.mp3" codec="mp3" streamrate="med" default="true"/>
                <audiostream streamurl="www.3.mp3" codec="mp3" streamrate="high"/>
            </audiostreams>
        </brand>
        <brand>
        </brand>
    </brandgroup>
    other 'brandgroups' with other 'brand'
</brand>

使用下一个Code,我能够为每个品牌组中的每个品牌获取Class Station的名称,代码和网站以及对象。


XDocument loadedData = XDocument.Load("netten.xml");
var data = from query in loadedData.Descendants("brand") 
           select new Station
           {
               Name = (string)query.Element("name"),
               Code = (int)query.Element("code"),
               Website = (string)query.Element("websiteurl"), 
           };

但是,我找不到一种方法来获取音频流。有'audiostreams'元素,它有3个孩子'audiostream'元素,我需要'streamurl'。

最好是存储3个streamurls,以便我可以在以后改变质量。然后我应该在Class Station中有一个字段:

String[] streamurls = {www.1.mp3, www.2.mp3, www.3.mp3};

并将3个streamurls存储在那里以便稍后选择。我已经尝试了一些与XML,属性和XElement相关的内容,但是我无法让它工作。

那里有人知道某种方式吗?

顺便说一下,我真的不知道如何在这里突出显示代码和内容,我希望它有效,其他我真的很抱歉......

2 个答案:

答案 0 :(得分:2)

如果您真的只想要这些网址,您可以执行以下操作(假设IEnumerable<string>上名为string[]的{​​{1}}(或StreamUrls}类型的属性:

Station

如果您想从from brand in loadedData.Descendants("brand") select new Station { Name = (string)brand.Element("name"), Code = (int)brand.Element("code"), Website = (string)brand.Element("websiteurl"), StreamUrls = brand.Element("audiostreams") .Elements("audiostream") .Attributes("streamurl") .Select(a => a.Value) .ToArray() } 元素中获取其他信息,请声明类似的类:

audiostream

然后查询如下:

class Stream
{
    public string Url { get; set; }
    public string Codec { get; set; }
    public string Rate { get; set; }
    public bool IsDefault { get; set; }
}

(如果from brand in loadedData.Descendants("brand") select new Station { Name = (string)brand.Element("name"), Code = (int)brand.Element("code"), Website = (string)brand.Element("websiteurl"), Streams = (from stream in brand.Element("audiostreams").Elements("audiostream") select new Stream { Url = (string)stream.Attribute("streamurl"), Codec = (string)stream.Attribute("codec"), Rate = (string)stream.Attribute("streamrate"), IsDefault = (string)stream.Attribute("default") == "true" }).ToArray() } Codec只能包含某些值,则将其表示为Rate将优于enum。)

答案 1 :(得分:0)

希望它有用

    static void Main(string[] args)
    {
        XDocument loadedData = XDocument.Load("netten.xml");
        var data = from query in loadedData.Descendants("brand")
                   group query by new { A = query.Element("name"), B = query.Element("code"), C = query.Element("websiteurl"), D = query.Element("audiostreams") } into g
                   select new
                   {
                       Name = g.Key.A + "",
                       Code = g.Key.B + "",
                       Website = g.Key.C + "",

                       AudioStreams = g.Key.D.Elements("audiostream")
                                                .Attributes("streamurl")
                                                .Select(x => x.Value)
                                                .ToArray()

                   };


        foreach (var x in data)
        {
            Console.WriteLine(x.Name);
            Console.WriteLine(x.Code);
            Console.WriteLine(x.Website);

            foreach (var url in x.AudioStreams)
                Console.WriteLine(url);
        }


        Console.ReadKey();
    }
}

xml文件:

<?xml version="1.0" encoding="utf-8" ?>
<brands xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <brandgroup>
    <brand>
      <code>blabla</code>
      <name>blabla</name>
      <logo>blabla</logo>
      <websiteurl>blabla</websiteurl>
      <audiostreams>
        <audiostream streamurl="www.1.mp3" codec="mp3" streamrate="low"/>
        <audiostream streamurl="www.2.mp3" codec="mp3" streamrate="med" default="true"/>
        <audiostream streamurl="www.3.mp3" codec="mp3" streamrate="high"/>
      </audiostreams>
    </brand>
  </brandgroup>
  <brandgroup>
    <brand>
      <code>blabla2</code>
      <name>blabla2</name>
      <logo>blabla</logo>
      <websiteurl>blabla2</websiteurl>
      <audiostreams>
        <audiostream streamurl="www.4.mp3" codec="mp3" streamrate="low"/>
        <audiostream streamurl="www.5.mp3" codec="mp3" streamrate="med" default="true"/>
        <audiostream streamurl="www.6.mp3" codec="mp3" streamrate="high"/>
      </audiostreams>
    </brand>
  </brandgroup>
</brands>