vb.net – WCF和验证应用程序块：无法自定义错误消息？

我已将ValidationBehaviour属性添加到我的服务合同中,并将FaultContract属性添加到操作中：

<ServiceContract()> _
<ValidationBehavior()> _
Public Interface IContract

    <OperationContract(),FaultContract(GetType(ValidationFault))> _
    Function GetCustomers(ByVal criteria As CustomersSearchCriteria) As List(Of Customer)

End Interface

然后,在CustomersSearchCriteria内部,我添加了验证属性：

<Validators.StringLengthValidator(1,3,ErrorMessage:="here's my error",Tag:="551")> _
Public Property Pin() As String
    Get
        Return _pin
    End Get
    Set(ByVal value As String)
        _pin = value
    End Set
End Property

但是当使用无效参数调用时,返回的SOAP如下所示：

<s:Fault>
     <faultcode>s:Client</faultcode>
     <faultstring xml:lang="fi-FI">The creator of this fault did not specify a Reason.</faultstring>
     <detail>
        <ValidationFault xmlns="http://www.microsoft.com/practices/EnterpriseLibrary/2007/01/wcf/validation" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
           <Details xmlns:a="http://schemas.datacontract.org/2004/07/Microsoft.Practices.EnterpriseLibrary.Validation.Integration.WCF">
              <a:ValidationDetail>
                 <a:Key>Pin</a:Key>
                 <a:Message>The length of the value must fall within the range "1" (Inclusive) - "3" (Inclusive).</a:Message>
                 <a:Tag>criteria</a:Tag>
              </a:ValidationDetail>
           </Details>
        </ValidationFault>
     </detail>
  </s:Fault>

该服务按原样返回ValidationFault,但它没有使用我定义的错误消息和标记,而是使用了一些通用值.这是一个错误还是我做错了什么？