[Serializable]
public abstract class ResponseBase
{
    public bool Successful { get; set; }
    public List<ResponseMessage> Messages { get; set; }

    //...Other code...
}

Messages集合可以是以下任何类型：

[Serializable]
[XmlInclude(typeof(DebugMessage))]
[XmlInclude(typeof(InfoMessage))]
[XmlInclude(typeof(ValidationMessage))]
[XmlInclude(typeof(WarnMessage))]
[XmlInclude(typeof(RecoverableFaultMessage))]
[XmlInclude(typeof(FatalFaultMessage))]
public abstract class ResponseMessage
{
    //..Other code...
}

具体版本：

[Serializable]
public class DebugMessage : ResponseMessage
{
    public override MessageType MessageType { get { return MessageType.Debug; } }
}
[Serializable]
public class InfoMessage : ResponseMessage
{
    public override MessageType MessageType { get { return MessageType.Info; } }
}
[Serializable]
public class ValidationMessage : ResponseMessage
{
    public override MessageType MessageType { get { return MessageType.Validation; } }
}
[Serializable]
public class WarnMessage : ResponseMessage
{
    public override MessageType MessageType { get { return MessageType.Warn; } }
}
[Serializable]
public class RecoverableFaultMessage : ResponseMessage
{
    public override MessageType MessageType { get { return MessageType.RecoverableFault; } }
}
[Serializable]
public class FatalFaultMessage : ResponseMessage
{
    public override MessageType MessageType { get { return MessageType.FatalFault; } }
}

所有DTO Response对象都继承自ResponseBase,但即使在WCF契约中使用以下ServiceKnownTypes也是如此

[ServiceKnownType(typeof(ResponseBase))]
[ServiceKnownType(typeof(ResponseMessage))]
[ServiceKnownType(typeof(List<ResponseMessage>))]
[ServiceKnownType(typeof(DebugMessage))]
[ServiceKnownType(typeof(InfoMessage))]
[ServiceKnownType(typeof(ValidationMessage))]
[ServiceKnownType(typeof(WarnMessage))]
[ServiceKnownType(typeof(RecoverableFaultMessage))]
[ServiceKnownType(typeof(FatalFaultMessage))]
[ServiceKnownType(typeof(List<DebugMessage>))]
[ServiceKnownType(typeof(List<InfoMessage>))]
[ServiceKnownType(typeof(List<ValidationMessage>))]
[ServiceKnownType(typeof(List<WarnMessage>))]
[ServiceKnownType(typeof(List<RecoverableFaultMessage>))]
[ServiceKnownType(typeof(List<FatalFaultMessage>))]

当我们将Message加载到ResponseBase Messages集合时,会抛出以下异常：

Error in line 1 position 906. Element
‘http://schemas.datacontract.org/2004/07/CX.Framework.Common.BaseTypes:ResponseMessage’
contains data from a type that maps to the name
‘http://schemas.datacontract.org/2004/07/CX.Framework.Common.BaseTypes:WarnMessage’.
The deserializer has no knowledge of any type that maps to this name.
Consider using a DataContractResolver or add the type corresponding to
‘WarnMessage’ to the list of known types – for example,by using the
KnownTypeAttribute attribute or by adding it to the list of known
types passed to DataContractSerializer.

我们已经在派生类型上完成了从ServiceKnownType到XMLInclude的所有操作.我对如何解决这个问题感到有点失落,并感谢任何人都能提供的帮助.