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Will WCF use the same ParameterInspector instance to handle BeforeCall and AfterCall?
class OperationParameterInspector : IParameterInspector
{
    public int _stateValue;

    public object BeforeCall(string operationName, object[] inputs)
    {
        _stateValue = (int) inputs[0];
        return null;
    }

    public void AfterCall(string operationName, object[] outputs, object returnValue, object correlationState)
    {
        int originalInput = _stateValue;
        return;
    }
}