<p>I have a Console application hosting a WCF service.  I would like to be able to fire an event from a method in the WCF service and handle the event in the hosting process of the WCF service.  Is this possible?  How would I do this?  Could I derive a custom class from ServiceHost?</p>

You don't need to inherit from
```
ServiceHost
```
. There are other approaches to your problem.
You can pass an instance of the service class, instead of a type to
```
ServiceHost
```
. Thus, you can create the instance before you start the
```
ServiceHost
```
, and add your own event handlers to any events it exposes.
Here's some sample code:
```
```
MyService svc = new MyService();
svc.SomeEvent += new MyEventDelegate(this.OnSomeEvent);
ServiceHost host = new ServiceHost(svc);
host.Open();
```
```
There are some caveats when using this approach, as described in
http://msdn.microsoft.com/en-us/library/ms585487.aspx
Or you could have a well-known singleton class, that your service instances know about and explicitly call its methods when events happen.