使用 XML 從 Element 中獲取價值

Question

我可以從 XML 獲取標題屬性，但想要提取標題，這是幾個節點。 我已經在代碼中留下了我的最新嘗試。 FirstAttributes 工作，所以我知道我正在連接，如果我返回 Console.WriteLine(e) 我得到完整的 XML。

var url = "http://musicbrainz.org/ws/2/release-group/?query=artist:%22coldplay%22%20AND%20primarytype:%22single%22";

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.UserAgent = "Hello World Super Script";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
XDocument doc = XDocument.Load(response.GetResponseStream());

IEnumerable<XElement> childList =
from el in doc.Elements()  
select el; 
//title is element we need  
foreach (XElement e in childList)  
Console.WriteLine("{0} {1} {2}", e.FirstAttribute, e.FirstAttribute.NextAttribute, e.Element("release-group").Attribute("title")); 

研究： C#從XML中提取數據

Answer 1

您可以執行以下操作。

var doc = XDocument.Load(response.GetResponseStream());
XNamespace ns = "http://musicbrainz.org/ns/mmd-2.0#";

var titleList = doc.Descendants(ns + "title");
foreach (var element in titleList) 
    Console.WriteLine(element.Value);

XDocument.Descendants()允許您搜索具有指定名稱的子節點。 請注意，您需要指定命名空間和元素名稱。

如果您觀察來自 WebRequest 的響應，您可以找到命名空間的詳細信息。

xmlns="http://musicbrainz.org/ns/mmd-2.0#" 

示例演示

Answer 2

嘗試以下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
using System.Net;

namespace ConsoleApplication1
{
    class Program
    {
        const string URL = @"http://musicbrainz.org/ws/2/release-group/?query=artist:%22coldplay%22%20AND%20primarytype:%22single%22";
        static void Main(string[] args)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
            request.UserAgent = "Hello World Super Script";
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            XDocument doc = XDocument.Load(response.GetResponseStream());
            XNamespace ns = doc.Root.GetDefaultNamespace();

            List<Group> groups = doc.Descendants(ns + "release-group").Select(x => new Group()
            {
                title = (string)x.Element(ns + "title"),
                name = (string)x.Descendants(ns + "name").FirstOrDefault(),
                releaseTitles = x.Element(ns + "release-list").Descendants(ns + "title").Select(y => (string)y).ToArray()
            }).ToList();
        }
    }
    public class Group
    {
        public string title { get; set; }
        public string name { get; set; }
        public string[] releaseTitles { get; set; }
    }
}