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我正在使用 IIS/asmx 来支持 Flash 客户端。我的一些服务层数据传输对象具有枚举值属性。在某些情况下，这些属性应该为空。

当将此类枚举属性的值为空的对象呈现给soap时，我收到此错误：

System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: Instance validation error: '0' is not a valid value for NameSpaceX.Model.NodeType.
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write1_NodeType(NodeType v)
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write4_PackageDTO(String n, String ns, PackageDTO o, Boolean isNullable, Boolean needType)
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write15_ArrayOfPackageDTO(Object o)
   at Microsoft.Xml.Serialization.GeneratedAssembly.ListOfPackageDTOSerializer1.Serialize(Object objectToSerialize, XmlSerializationWriter writer)
   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id)
   --- End of inner exception stack trace ---
   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id)
   at System.Xml.Serialization.XmlSerializer.Serialize(TextWriter textWriter, Object o, XmlSerializerNamespaces namespaces)
   at System.Xml.Serialization.XmlSerializer.Serialize(TextWriter textWriter, Object o)
   at System.Web.Services.Protocols.XmlReturnWriter.Write(HttpResponse response, Stream outputStream, Object returnValue)
   at System.Web.Services.Protocols.HttpServerProtocol.WriteReturns(Object[] returnValues, Stream outputStream)
   at System.Web.Services.Protocols.WebServiceHandler.WriteReturns(Object[] returnValues)
   at System.Web.Services.Protocols.WebServiceHandler.Invoke()

有没有更好的解决方案来创建一个值为 0 的枚举成员（例如 [0，“null”]？我怀疑我在这里缺乏基本知识。

谢谢。

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1 回答 1

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我的第一个倾向是给你指出Nullable<T>类型。但是，在四处寻找有关Nullable<T>SOAP 的文档后，似乎它可能不受支持。您可能想进一步探索这一点。

也就是说，Enums 声明一个NotSet = 0成员是很常见的。

于 2009-01-17T00:53:28.550 回答