Externalizing exceptions from the WCF service host

For services hosted using the WCF service host; any unhandled exceptions thrown by the service, WCF internals, or channel stack are not externalized by default. To be informed of these exceptions, an error handler must be registered.

The following code provides an example of defining the error handler service behavior which can be applied as an attribute of a service:

using System.ServiceModel.Dispatcher;
using System.Collections.ObjectModel;
....
    public class ErrorHandlerBehaviorAttribute : Attribute, IServiceBehavior, IErrorHandler
    {
        //
        // IServiceBehavior Interface
        //
        public void AddBindingParameters(ServiceDescription serviceDescription,
           ServiceHostBase serviceHostBase, CollectionServiceEndpoint endpoints,
           BindingParameterCollection bindingParameters)
        {
        }
        public void ApplyDispatchBehavior(ServiceDescription serviceDescription,
            ServiceHostBase serviceHostBase)
        {
            foreach (ChannelDispatcher channelDispatcher in serviceHostBase.ChannelDispatchers) {
                channelDispatcher.ErrorHandlers.Add(this);
            }
        }
        public void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
        {
        }

        //
        // IErrorHandler Interface
        //
        public bool HandleError(Exception e)
        {
            // Process the exception in the required way, in this case just outputting to the console
            Console.Out.WriteLine(e);

            // Always return false to allow any other error handlers to run
            return false;
        }
        public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
        {
        }
    }