Wcf exception handling throw an error

Question

Hi I have a problem handling exceptions in wcf. I have a service like this one:

[ServiceContract] public interface IAddressService { [OperationContract] [FaultContract(typeof(ExecuteCommandException))] int SavePerson(string idApp, int idUser, Person person); }

I am calling the SavePerson() on the service in the WCFTestClient utility. The SavePerson() implementation is:

public int SavePerson(string idApp, int idUser, Person person) { try { this._savePersonCommand.Person = person; this.ExecuteCommand(idUser, idApp, this._savePersonCommand); return this._savePersonCommand.Person.Id; } catch (ExecuteCommandException ex) { throw new FaultException<ExecuteCommandException>(ex, new FaultReason("Error in 'SavePerson'")); } }

But I get this error:

Failed to invoke the service. Possible causes: The service is offline or inaccessible; the client-side configuration does not match the proxy; the existing proxy is invalid. Refer to the stack trace for more detail. You can try to recover by starting a new proxy, restoring to default configuration, or refreshing the service.

if I change the SavePerson method and instead of:

catch (ExecuteCommandException ex) { throw new FaultException<ExecuteCommandException>(ex, new FaultReason("Error in 'SavePerson'")); }

I do

catch(Exception) { throw; }

I don't get the above error, but I only get the exception message and no inner exception. What am I doing wrong?

ExecuteCommandException inherits from Exception and is marked serializable. I found that if I send exception the above error happens. And found that when an exception is thrown at the server side, wcf closes the channel and disconnects the client. — Luka
– Luka, Commented Sep 6, 2010 at 6:46

Christian Hayter · Accepted Answer · 2010-09-02 14:30:05Z

When you define the fault contract:

[FaultContract(typeof(ExecuteCommandException))]

you must not specify an exception type. Instead, you specify a data contract of your choice to pass back any values that you deem necessary.

For example:

[DataContract] public class ExecuteCommandInfo { [DataMember] public string Message; } [ServiceContract] public interface IAddressService { [OperationContract] [FaultContract(typeof(ExecuteCommandInfo))] int SavePerson(string idApp, int idUser, Person person); } catch (ExecuteCommandException ex) { throw new FaultException<ExecuteCommandInfo>(new ExecuteCommandInfo { Message = ex.Message }, new FaultReason("Error in 'SavePerson'")); }

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