我们为应用程序中的所有响应DTO使用一个基类。该类具有以下签名:
[Serializable]
public abstract class ResponseBase
{
public bool Successful { get; set; }
public List<ResponseMessage> Messages { get; set; }
//...Other code...
}
消息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...
}
的具体版本:
[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响应对象都继承自ResponseBase,但即使在WCF契约上使用以下ServiceKnownTypes
[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>))]
当我们将消息加载到ResponseBase Messages集合中时,会抛出以下异常:
第1行位置906出错。元素"http://schemas.datacontract.org/2004/07/CX.Framework.Common.BaseTypes: ResponseMessage"包含来自映射到名称的类型的数据"http://schemas.datacontract.org/2004/07/CX.Framework.Common.BaseTypes: WarnMessage"。反序列化程序不知道映射到该名称的任何类型。考虑使用DataContractResolver或添加对应的类型将'WarnMessage'添加到已知类型列表中-例如,通过使用KnownTypeAttribute属性或将其添加到已知列表中传递给DataContractSerializer的类型
我们已经对派生类型做了从ServiceKnownType到XMLInclude的所有工作。对于如何解决这个问题,我有点不知所措,如果有人能提供帮助,我将不胜感激。
几点:
1) [XmlInclude]
对DataContractSerializer
没有影响,它只被XmlSerializer
使用。
2)正如评论者"flem"建议的那样,我将直接在ResponseMessage
上使用[KnownType]
,而不是在服务上使用[ServiceKnownType]
。
3)我不记得DataContractSerializer
是否甚至在[Serializable]
类型上寻找[KnownType]
。至少现在为了测试的目的,如果上面的#2没有帮助,请尝试将类型设置为[DataContract]
(并将数据成员属性设置为[DataMember]
)。