I'm using IIS/asmx to support a Flash client. Some of my service layer data transfer objects have properties that are enumeration values. There are cases where these properties should be null.
When an object with a null value for such an enumeration property is rendered to soap, I receive this error:
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()
Is there a better solution then to create an enumeration member with value 0 (eg [0, "null"]? I suspect that I'm lacking basic knowledge here.
Thanks.
My first inclination was to point you to the Nullable<T>
type. However, after looking around for documentation on Nullable<T>
and SOAP, it appears that it might not be supported. You might want to explore this further.
That said, it is very common for Enums to declare a NotSet = 0
member.
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