Adding Properties to WCF DataContract

I've added a service reference to my WCF webservice which generated all of my datacontract objects. I'm using BasicHttpBinding. Using a partial class, I've made one of these objects inherit from another class that adds some properties to it. Now it throws an error when making a call to the service:

Test method CP.Exg2010.Tests.UnitTest1.TestWCF threw exception: System.ServiceModel.Dispatcher.NetDispatcherFaultException: The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://tempuri.org/:RunResult. The InnerException message was 'Error in line 1 position 283. 'Element' 'CommandResult' from namespace 'uri://mycomp.corp/line/exg2010' is not expected. Expecting element '_EngineTracingData'.'. Please see InnerException for more details. ---> System.Runtime.Serialization.SerializationException: Error in line 1 position 283. 'Element' 'CommandResult' from namespace 'uri://mycomp.corp/line/exg2010' is not expected. Expecting element '_EngineTracingData'.

CommandResult is a property that is part of the WSDL. _EngineTracingData is the private field used by a property in a base class.

<XmlIgnore()> <SoapIgnore()> <Newtonsoft.Json.JsonIgnore()> _
Private _EngineTracingData As String = String.Empty
<XmlIgnore()> <SoapIgnore()> <Newtonsoft.Json.JsonIgnore()>
Public Property EngineTra开发者_如何学JAVAcingData As String Implements Interfaces.ICPMasterBaseInfo.EngineTracingData
    Get
        Return Me._EngineTracingData
    End Get
    Set(ByVal value As String)
        Me._EngineTracingData = value
    End Set
End Property

I read something about the deserialization happening in alphabetic order, which would explain why _EngineTracingData is first. But, that field/property shouldn't even be used in deserialization!

Any help would be appreciated!

Ah, I found it!

Adding

<NonSerialized()>

to the private fields in the base class fixed my issue!