How To Add A SyndicationElementExtension To A Synd

问题:

Using the .NET System.ServiceModel.Syndication classes...

I would like to add a new SyndicationElementExtension to a SyndicationItem that will export the following XML:

<media:thumbnail url="http://www.foo.com/keyframe.jpg" width="75" height="50" time="12:05:01.123" />

Something along the lines of:

syndicationItem.ElementExtensions.Add(new SyndicationElementExtension("thumbnail", "http://video.search.yahoo.com/mrss", ?

How do you create a simple SyndicationElementExtension with a few attributes?

回答1:

Just to simplify for the next guy who comes along trying to figure this out, here's a working example of adding a basic item thumbnail (RSS 2.0 enclosure in this case) along the lines of the documentation:

SyndicationItem item = new SyndicationItem();

// populate item...

item.ElementExtensions.Add(
    new XElement( "enclosure",
        new XAttribute( "type", "image/jpeg" ),
        new XAttribute( "url", "http://path.to/my/image.jpg" )
    ).CreateReader()
);

You can also dump the attributes and just set textual content after the tag name if you want a simple tag, i.e. <comments>http://my.comments/feed</comments>.

回答2:

Found the answer here: http://msdn.microsoft.com/en-us/library/bb943475.aspx

The SyndicationElementExtensionCollection class can also be used to create element extensions from an XmlReader instance. This allows for easy integration with XML processing APIs such as XElement as shown in the following sample code.

feed.ElementExtensions.Add(new XElement("xElementExtension",
        new XElement("Key", new XAttribute("attr1", "someValue"), "Z"),
        new XElement("Value", new XAttribute("attr1", "someValue"), 
        "15")).CreateReader());