Question

i have build a global exception handling for my wcf application. I have a class that implements ‘IErrorHandler’ and handles the exception. I can register the ErrorHandler with a ‘IServiceBehavior’ attribute. (So i don’t need to touch every function)

I use the class ‘FaultException’ to wrap my exception object.

Dim sysEx As SystemException = 'Do Convert
Dim fex As New FaultException(Of SystemException)(sysEx, sysEx.Message)
Dim faultMessage As MessageFault = fex.CreateMessageFault
fault = System.ServiceModel.Channels.Message.CreateMessage(version, faultMessage, fex.Action)

Now I can retrieve the error message at client side. But unfortunally I can’t retrieve the original exception type or the original stacktrace.

Is there an easy option to solve the problem without adding ‘FaultContract’ to each function in my service?

Thank you

Answer 1

Steve & Saravanan are both correct. Here is how to create a custom fault type & how to use it:

Custom fault contract:

[DataContract]
public class UncaughtErrorFault
{
    [DataMember]
    public string ExecptionType { get; set; }

    [DataMember]
    public string Message { get; set; }

    [DataMember]
    public string StackTrace { get; set; }
}

IErrorHandler method override:

public void ProvideFault(Exception error,
                         MessageVersion version,
                         ref Message fault)
{
    var fe = new FaultException<UncaughtErrorFault>(
        new UncaughtErrorFault
            {
                ExecptionType = error.GetType().Name,
                Message = error.Message,
                StackTrace = error.StackTrace
            },
        error.Message,
        FaultCode.CreateReceiverFaultCode(
            new FaultCode(error.GetType().Name)));

    var mf = fe.CreateMessageFault();

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