entlib wcf集成在尝试通过引用传递参数时抛出异常

Question

在WCF服务应用程序中使用企业库时，当我们尝试对通过引用传入参数的操作使用验证时，我们会遇到以下异常：

运营合同：

Hubs GetRoute(
    string sourceDepotId,

    [NotNullValidator(MessageTemplate = "...")]
    [RegexValidator("[a-zA-Z]", MessageTemplate = "...")]
    [StringLengthValidator(2, RangeBoundaryType.Inclusive, 2, RangeBoundaryType.Inclusive, MessageTemplate = "...")]
    string countryCode,

    string zipCode,
    DateTime shippingDate,
    DateTime? deliveryDate,
    ref RoutingCodes routingCode,
    out string errorMessage);

例外：

  

类型＆＃39; RoutingCodes＆amp;＆＃39;不得用作类型参数。

[ArgumentException: The type 'RoutingCodes&' may not be used as a type argument.]
   System.RuntimeType.ThrowIfTypeNeverValidGenericArgument(RuntimeType type) +14240432
   System.RuntimeType.SanityCheckGenericArguments(RuntimeType[] genericArguments, RuntimeType[] genericParamters) +57
   System.RuntimeType.MakeGenericType(Type[] instantiation) +218
   Microsoft.Practices.EnterpriseLibrary.Validation.ValidatorFactory.WrapAndInstrumentValidator(Validator validator, Type type) +87
   Microsoft.Practices.EnterpriseLibrary.Validation.ValidatorFactory.FindOrCreateValidator(ValidatorCacheKey cacheKey, Func`3 wrapAndInstrument) +190
   Microsoft.Practices.EnterpriseLibrary.Validation.ValidatorFactory.CreateValidator(Type targetType, String ruleset) +176
   Microsoft.Practices.EnterpriseLibrary.Validation.Integration.WCF.ValidationParameterInspector.CreateInputParameterValidator(ParameterInfo param, String ruleSet) +99
   Microsoft.Practices.EnterpriseLibrary.Validation.Integration.WCF.ValidationParameterInspector..ctor(OperationDescription operation, String ruleSet) +221
   Microsoft.Practices.EnterpriseLibrary.Validation.Integration.WCF.ValidationBehavior.ApplyDispatchBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, DispatchRuntime dispatchRuntime) +161
   System.ServiceModel.Description.DispatcherBuilder.InitializeServiceHost(ServiceDescription description, ServiceHostBase serviceHost) +5106
   System.ServiceModel.ServiceHostBase.InitializeRuntime() +85
   System.ServiceModel.ServiceHostBase.OnOpen(TimeSpan timeout) +48
   System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) +293
   System.ServiceModel.HostingManager.ActivateService(ServiceActivationInfo serviceActivationInfo, EventTraceActivity eventTraceActivity) +129
   System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath, EventTraceActivity eventTraceActivity) +733

所述类型是枚举类型。我知道你实际上可以在WCF中通过ref传递参数并且它可以工作，如documentation中所述。

这是企业资源库验证区中的错误还是我们做错了什么？除了不使用验证块之外，你如何规避异常？