Question

I’d like to throw custom exception from WCF server but it doesn’t work well for my clients. What I do:

My custom exception:

[DataContract]    
public class MyCustomException
{
  [DataMember]
  public string MyField { get; set; }
}

My WCF service contract

[ServiceContract]    
public interface IMyService
{
       [OperationContract]
       [FaultContract(typeof(MyCustomException))]
       bool Foo();
}

My global exception handler for WCF service (this code hits when Foo is called):

public void ProvideFault(Exception error, System.ServiceModel.Channels.MessageVersion version, ref System.ServiceModel.Channels.Message fault)
{
  var ex = new MyCustomException { MyField = "..." };
  var fe = new FaultException<MyCustomException>(
                    ex,
                    new FaultReason("reason"),
                    FaultCode.CreateSenderFaultCode(new FaultCode("some-string")));

  var flt = fe.CreateMessageFault();
  fault = Message.CreateMessage(
    version,
    flt,
    string.Empty
  );        
}

Then… my client:

try
{
   Create channel factory and call Foo
}
catch(FaultException<MyCustomException> ex)
{
  // OOOPS! It doesn't work!!! 
}
catch(FaultException ex)
{
  // This block catches exception 
}

What can be wrong here? Thank you in advance!

Answer 1

I’ve found the issue in ProvideFault method:

fault = Message.CreateMessage(
    version,
    flt,
    string.Empty
  ); 

should be replaced with

fault = Message.CreateMessage(
    version,
    flt,
    fe.Action
  ); 

Now everything comes ok!