linqを使用したatom名前空間

Question

次のxmlを持っています

    <?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/">
<entry><id><![CDATA[text]]></id><
author><name><![CDATA[film24]]></name></author><title><![CDATA[text]]></title>
<updated>2009-10-30T15:55:13+00:00</updated><published>2009-10-30T00:00:00+00:00</published>
<media:thumbnail type="image/jpeg" title="thumbnail" url=""/>
<media:content type="video/flv" title="video" url="" expression="high"/>
<media:content type="video/flv" title="video" url="" expression="low"/>
</entry>
</feed>

次のネームスペースを含めると、xmlをクエリできません。つまり、結果を返しません。

http://www.w3.org/2005/Atom

XMLをクエリする方法は次のとおりです

        XNamespace nsMedia = "http://search.yahoo.com/mrss/";
        XNamespace nsAtom = "http://www.w3.org/2005/Atom";

        string url = HttpContext.Current.Server.MapPath(ConfigHelper.GetValue("FeedUri"));
        var feed = XElement.Load(url);
        var posts = from c in feed.Descendants(nsAtom + "entry")
                    select new CDNEntry
                    {
                         Id = (string)c.Element(nsAtom + "id").Value,
                         Author = (string)c.Element(nsAtom + "author").Value,
                         Title = (c.Element("title") != null) ? (string)c.Element(nsAtom + "title").Value : "",
                         Summary = (c.Element("summary") != null) ? (string)c.Element(nsAtom + "summary").Value : "",
                         Thumbnail = (string)c.Element(nsMedia + "thumbnail").Attribute(nsAtom + "url").Value,
                         FLV = (string)c.Element(nsMedia + "content").Attribute(nsAtom + "url").Value,
                         Updated = DateTime.Parse((string)c.Element(nsAtom + "updated").Value),
                         Published = DateTime.Parse((string)c.Element(nsAtom + "published").Value)
                    };

        return posts.ToList();

Answer 1

サンプルXMLは途切れましたが、問題はおそらくより多くの名前空間を使用する必要があることです。次のようなものを試してください：

XNamespace nsMedia = "http://search.yahoo.com/mrss/";
XNamespace nsAtom = "http://www.w3.org/2005/Atom";

var feed = GetFeed();
var posts = from c in feed.Descendants(nsAtom + "entry")
            where (string)c.Element(nsAtom + "id") == uniqueUrl
            select new CDNEntry
            {
                Id = (string)c.Element(nsAtom + "id"),
                Author = (string)c.Element(nsAtom + "author"),
                Title = (string)c.Element(nsAtom + "title") ?? "",
                Summary = (string)c.Element(nsAtom + "summary") ?? "",
                Thumbnail = (string)c.Element(nsMedia + "thumbnail").Attribute("url"),
                FLV = (string)c.Element(nsMedia + "content").Attribute("url"),
                Updated = (DateTime)c.Element(nsAtom + "updated"),
                Published = (DateTime)c.Element(nsAtom + "published")
            };