IErrorHandler doesn't seem to be handling my errors in WCF .. any ideas?
- by John Nicholas
Have been readign around on IErrorHandler and want to go the config route.
so, I have read the following in an attempt to implement it.
MSDN
Keyvan Nayyeri blog about the type defintion
Rory Primrose Blog
I have got it to compile and from the various errors i have fixed it seems like WCF is actually loading the error handler. My problem is that the exception that i am throwing to handle in the error handler doesn;t get the exception passed to it.
My service implementation simply calls a method on another class that throws ArgumentOutOfRangeException - however this exception never gets handled by the handler.
My web.config
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="basic">
<security mode="None" />
</binding>
</basicHttpBinding>
</bindings>
<extensions>
<behaviorExtensions>
<add name="customHttpBehavior"
type="ErrorHandlerTest.ErrorHandlerElement, ErrorHandlerTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
</behaviorExtensions>
</extensions>
<behaviors>
<serviceBehaviors>
<behavior name="exceptionHandlerBehaviour">
<serviceMetadata httpGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="true"/>
<customHttpBehavior />
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service behaviorConfiguration="exceptionHandlerBehaviour" name="ErrorHandlerTest.Service1">
<endpoint binding="basicHttpBinding" bindingConfiguration="basic" contract="ErrorHandlerTest.IService1" />
</service>
</services>
Service Contract
[ServiceContract]
public interface IService1
{
[OperationContract]
[FaultContract(typeof(GeneralInternalFault))]
string GetData(int value);
}
The ErrorHandler class
public class ErrorHandler : IErrorHandler , IServiceBehavior
{
public bool HandleError(Exception error)
{
Console.WriteLine("caught exception {0}:",error.Message );
return true;
}
public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
{
if (fault!=null )
{
if (error is ArgumentOutOfRangeException )
{
var fe = new FaultException<GeneralInternalFault>(new GeneralInternalFault("general internal fault."));
MessageFault mf = fe.CreateMessageFault();
fault = Message.CreateMessage(version, mf, fe.Action);
}
else
{
var fe = new FaultException<GeneralInternalFault>(new GeneralInternalFault(" the other general internal fault."));
MessageFault mf = fe.CreateMessageFault();
fault = Message.CreateMessage(version, mf, fe.Action);
}
}
}
public void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
{
}
public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
{
IErrorHandler errorHandler = new ErrorHandler();
foreach (ChannelDispatcherBase channelDispatcherBase in serviceHostBase.ChannelDispatchers)
{
ChannelDispatcher channelDispatcher = channelDispatcherBase as ChannelDispatcher;
if (channelDispatcher != null)
{
channelDispatcher.ErrorHandlers.Add(errorHandler);
}
}
}
public void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
{
}
}
And the Behaviour Extension Element
public class ErrorHandlerElement : BehaviorExtensionElement
{
protected override object CreateBehavior()
{
return new ErrorHandler();
}
public override Type BehaviorType
{
get { return typeof(ErrorHandler); }
}
}
