Does WCF support WS-Eventing? - wcf

Question

I know WCF supports many WS-* protocols but WS-Eventing does seem to be listed.
I do know that WCF has a pub/sub model, but is it WS-Eventing compliant?

Answer 1

I seem to remember reading about this on CodeProject a while ago.
Sorry I can't help more, but this is the article by Roman Kiss.

Answer 2

At least with WCF4 you can simply create a wsdl client by importing the WS-Eventing WSDL (with a soap binding). It requires a duplex binding so either http-duplex or simple tcp should work. The problem is adding the correct callback. For us this did the trick
Subscribe s = new Subscribe();
(s.Delivery = new DeliveryType()).Mode = "http://schemas.xmlsoap.org/ws/2004/08/eventing/DeliveryModes/Push";
XmlDocument doc = new XmlDocument();
using (XmlWriter writer = doc.CreateNavigator().AppendChild())
{
EndpointReferenceType notifyTo = new EndpointReferenceType();
(notifyTo.Address = new AttributedURI()).Value = callbackEndpoint.Uri.AbsoluteUri;
XmlRootAttribute notifyToElem = new XmlRootAttribute("NotifyTo");
notifyToElem.Namespace = "http://schemas.xmlsoap.org/ws/2004/08/eventing";
XmlDocument doc2 = new XmlDocument();
using (XmlWriter writer2 = doc2.CreateNavigator().AppendChild())
{
XmlRootAttribute ReferenceElement = new XmlRootAttribute("ReferenceElement");
foreach(AddressHeader h in callbackEndpoint.Headers)
{
h.WriteAddressHeader(writer2);
}
writer2.Close();
notifyTo.ReferenceParameters = new ReferenceParametersType();
notifyTo.ReferenceParameters.Any = notifyTo.ReferenceParameters.Any = doc2.ChildNodes.Cast<XmlElement>().ToArray<XmlElement>();
}
new XmlSerializer(notifyTo.GetType(), notifyToElem).Serialize(writer, notifyTo);
}
(s.Delivery.Any = new XmlElement[1])[0] = doc.DocumentElement;
(s.Filter = new FilterType()).Dialect = "http://schemas.xmlsoap.org/ws/2006/02/devprof/Action";
(s.Filter.Any = new System.Xml.XmlNode[1])[0] = new System.Xml.XmlDocument().CreateTextNode("http://www.teco.edu/SensorValues/SensorValuesEventOut");
SubscribeResponse subscription;
try
{
Console.WriteLine("Subscribing to the event...");
//Console.ReadLine();
subscription = eventSource.SubscribeOp(s);
}

Answer 3

There is no native pub/sub model in WCF 3.0, however there are a few options.
- The Roman Kiss article Ash found.
- There is a lot of other patterns you could implement (covered in MSDN Mag)
- Juval Lowy has two framework implementations you can download on his site at IDesign
- Lastly what I am using currently to mimic this with little overhead is MSMQ.