是的，我针对 Beta 编写了该教程。
下面是更新到 RTM 版本的代码。
如果可以的话，一个建议是，这个示例使用了一个简单的具体类型的“白名单”，为它构建了 RSS/Atom 提要（在本例中是我的Url模型）。理想情况下，在更复杂的场景中，您应该针对接口而不是具体类型设置格式化程序，并让所有应该作为 RSS 公开的模型来实现该接口。
希望这可以帮助。
public class SyndicationFeedFormatter : MediaTypeFormatter
{
private readonly string atom = "application/atom+xml";
private readonly string rss = "application/rss+xml";
public SyndicationFeedFormatter()
{
SupportedMediaTypes.Add(new MediaTypeHeaderValue(atom));
SupportedMediaTypes.Add(new MediaTypeHeaderValue(rss));
}
Func<Type, bool> SupportedType = (type) =>
{
if (type == typeof(Url) || type == typeof(IEnumerable<Url>))
return true;
else
return false;
};
public override bool CanReadType(Type type)
{
return SupportedType(type);
}
public override bool CanWriteType(Type type)
{
return SupportedType(type);
}
public override Task WriteToStreamAsync(Type type, object value, Stream writeStream, System.Net.Http.HttpContent content, System.Net.TransportContext transportContext)
{
return Task.Factory.StartNew(() =>
{
if (type == typeof(Url) || type == typeof(IEnumerable<Url>))
BuildSyndicationFeed(value, writeStream, content.Headers.ContentType.MediaType);
});
}
private void BuildSyndicationFeed(object models, Stream stream, string contenttype)
{
List<SyndicationItem> items = new List<SyndicationItem>();
var feed = new SyndicationFeed()
{
Title = new TextSyndicationContent("My Feed")
};
if (models is IEnumerable<Url>)
{
var enumerator = ((IEnumerable<Url>)models).GetEnumerator();
while (enumerator.MoveNext())
{
items.Add(BuildSyndicationItem(enumerator.Current));
}
}
else
{
items.Add(BuildSyndicationItem((Url)models));
}
feed.Items = items;
using (XmlWriter writer = XmlWriter.Create(stream))
{
if (string.Equals(contenttype, atom))
{
Atom10FeedFormatter atomformatter = new Atom10FeedFormatter(feed);
atomformatter.WriteTo(writer);
}
else
{
Rss20FeedFormatter rssformatter = new Rss20FeedFormatter(feed);
rssformatter.WriteTo(writer);
}
}
}
private SyndicationItem BuildSyndicationItem(Url u)
{
var item = new SyndicationItem()
{
Title = new TextSyndicationContent(u.Title),
BaseUri = new Uri(u.Address),
LastUpdatedTime = u.CreatedAt,
Content = new TextSyndicationContent(u.Description)
};
item.Authors.Add(new SyndicationPerson() { Name = u.CreatedBy });
return item;
}
}