Linq to XML: get default namespace of rss

问题

I call the methods within several classes this way:

GetResult(XElement item, XNamespace ns) {
    item.Element(ns + "title").Value;
}

In order to initialize the feeds and to access the elements as stated above I want to find out the default namespace. Without any namespace declaration it works fine (item.Element("title").Value) and the value of the element is returned.

So how can I find out the correct namespace? The result of the method root.GetDefaultNamespace() is empty somehow...

<rss xmlns:content="http://purl.org/rss/1.0/modules/content/" version="2.0">
    <channel>...</channel>
</rss>

//edit

Ok, my code so far:

    XDocument thisFeed = XDocument.Load(@"http://www.spiegel.de/schlagzeilen/tops/index.rss");
    XElement root = thisFeed.Root;
    XNamespace ns = root.GetNamespaceOfPrefix("content");
    //result:
    Console.WriteLine("DefaultNamespace: " + root.GetDefaultNamespace());
    //result: http://purl.org/rss/1.0/modules/content/
    Console.WriteLine("GetNamespaceOfPrefix('content'): " + ns);
    //works
    Console.WriteLine("Result: " + root.Element("channel").Element("title").Value);
    //Doesn't work
    Console.WriteLine("Result: " + root.Element(ns + "channel").Element(ns + "title").Value);

回答1:

Try it like this:

XNamespace ns = doc.Root.GetNamespaceOfPrefix("content");

content in your sample is prefix. Nice explanation of namespaces and prefixes can be found at this w3schools article

UPDATE:

There is no default namespace defined in that document, there is only namespace for elements with prefix, other elements are retrieved without namespace. I found only element <content:encoded> to be using prefix, for that element you need to use ns.

来源：https://stackoverflow.com/questions/14957265/linq-to-xml-get-default-namespace-of-rss

标签

xml

linq-to-xml