从 RSS ATOM 读取 ReadElementExtensions答案

【问题标题】：Read ReadElementExtensions from RSS ATOM从 RSS ATOM 读取 ReadElementExtensions
【发布时间】：2015-12-15 19:16:04
【问题描述】：

我有以下代码，但无法将 RSS ATOM 提要反序列化为类。无法读取“团队”节点，并且其他属性似乎没有被填充。当我注释掉“团队”节点时。

这是我的代码：

RSS 提要的网址： http://www.volleybal.nl/application/handlers/export.php?format=rss&type=poule&standen=D3K&iRegionId=7000

    public static SyndicationFeed GetFeed(string feedUrl)
    {
        Uri serviceUri = new Uri(feedUrl);
        WebClient downloader = new WebClient();

        Stream responseStream = downloader.OpenRead(serviceUri);

        XmlReader responseReader = XmlReader.Create(responseStream);
        SyndicationFeed syndicationFeed = SyndicationFeed.Load(responseReader);
        return syndicationFeed;
    }

System.Collections.ObjectModel.Collection<Stand> oo = programFeed.ElementExtensions.ReadElementExtensions<Stand>("ranking", "http://www.nevobo.nl/competitie/");

[Serializable]
[XmlSerializerFormat]
[DataContract(Name = "stand", Namespace = "http://www.nevobo.nl/competitie/")]
[XmlRoot(ElementName = "stand", Namespace = "http://www.nevobo.nl/competitie/")]
public class Stand
{
    public Stand()
    {
    }

    [DataMember(Name = "nummer")]
    [XmlElement("nummer")]
    public string Nummer { get; set; }

    [DataMember(Name = "team")]
    [XmlElement("team")]
    public Team Team { get; set; }

    [DataMember(Name = "wedstrijden")]
    [XmlElement("wedstrijden")]
    public string Wedstrijden { get; set; }

    [DataMember(Name = "punten")]
    [XmlElement("punten")]
    public string Punten { get; set; }

    [DataMember(Name = "setsvoor")]
    [XmlElement("setsvoor")]
    public string Setsvoor { get; set; }

    [DataMember(Name = "setstegen")]
    [XmlElement("setstegen")]
    public string Setstegen { get; set; }

    [DataMember(Name = "puntenvoor")]
    [XmlElement("puntenvoor")]
    public string Puntenvoor { get; set; }

    [DataMember(Name = "puntentegen")]
    [XmlElement("puntentegen")]
    public string Puntentegen { get; set; }
}

[Serializable]
//[XmlSerializerFormat]
//[DataContract(Name = "team")]
[DataContract(Name = "team", Namespace = "http://www.nevobo.nl/competitie/")]
//[XmlRoot(ElementName = "team", Namespace = "http://www.nevobo.nl/competitie/")]
//[System.Xml.Serialization.XmlType(AnonymousType = true)]
public class Team
{
    public Team()
    {
    }

    [DataMember(Name = "id")]
    [XmlAttribute(AttributeName ="id")]
    public string Id { get; set; }

    [DataMember]
    [XmlText]
    public string Text { get; set; }
}

【问题讨论】：

标签： c# .net serialization rss atom-feed

【解决方案1】：

我在使用 ReadElementExtension 方法和读取自定义属性时遇到了类似的问题。我通过使用 XElement 作为返回类型解决了这个问题。

这是我的处理方式（使用 C# 6.0 构造）：

private XElement ReadElement(SyndicationFeed feed, string extspace, string extname)
{
    var elements = feed.ElementExtensions.ReadElementExtensions<XElement>(extname, extspace);
    return elements.FirstOrDefault();
}

private XAttribute ReadAttribute(string extspace, string extname, string attname)
{
    var element = ReadElement(extspace, extname);
    var attribute = element?.Attribute(attname);
    return attribute;
}

这里是调用这些方法的一些示例代码，假设“feed”是一个实例化的 SyndicationFeed 对象。这些读取 iTunes 播客的自定义元素和属性：

private const string ITUNES = "http://www.itunes.com/dtds/podcast-1.0.dtd";
...
string explicitValue =  ReadElement(ITUNES, "explicit")?.Value;
string imageUrl = ReadAttribute(ITUNES, "image", "href")?.Value;

【讨论】：