WCF异常:无法添加到已知类型的列表中

Question

今天是个好日子...

我收到一个意外的WCF错误,抱怨"已知类型",它们的名称相似,但在不同的名称空间中(请参阅下面的错误).

...请记住我还在试验这一切.

也…

我已经理解了常规Web服务的性质FORCES你要展平你的对象层次结构,但我读过的所有内容都表明你不必用WCF做到这一点......这就是为什么我要尝试这个.

所以我的问题是......

• 问:是否有可能告诉WCF不要忽略名称间距？
• 问:我错过了标签吗？不要将WCF标记(下面)考虑到名称间距吗？
• 问:我是否必须压扁对象层次结构？

基本错误是......

类型'wcfFISH.StateManagement.Contractor.New'无法添加到已知类型列表中,因为已存在具有相同数据协定名称'wcfFISH.StateManagement.Contractor:New'的另一种类型'wcfFISH.StateManagement.CostDivision.New'.

错误看起来像......

An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is:
System.InvalidOperationException: An exception was thrown in a call to a WSDL export extension: System.ServiceModel.Description.DataContractSerializerOperationBehavior
 contract: http://tempuri.org/:IFishData ----> System.InvalidOperationException: Type 'wcfFISH.StateManagement.Contractor.New' cannot be added to list of known types since another type 'wcfFISH.StateManagement.CostDivision.New' with the same data contract name 'wcfFISH.StateManagement.Contractor:New' is already present.
   at System.Runtime.Serialization.DataContract.CheckAndAdd(Type type, Dictionary`2 typesChecked, Dictionary`2& nameToDataContractTable)
   at System.Runtime.Serialization.DataContract.ImportKnownTypeAttributes(Type type, Dictionary`2 typesChecked, Dictionary`2& knownDataContracts)
   at System.Runtime.Serialization.DataContract.ImportKnownTypeAttributes(Type type)
   at System.Runtime.Serialization.ClassDataContract.ClassDataContractCriticalHelper.get_KnownDataContracts()
   at System.Runtime.Serialization.ClassDataContract.get_KnownDataContracts()
   at System.Runtime.Serialization.DataContractSet.AddClassDataContract(ClassDataContract classDataContract)
   at System.Runtime.Serialization.DataContractSet.Add(XmlQualifiedName name, DataContract dataContract)
   at System.Runtime.Serialization.DataContractSet.AddClassDataContract(ClassDataContract classDataContract)
   at System.Runtime.Serialization.DataContractSet.Add(XmlQualifiedName name, DataContract dataContract)
   at System.Runtime.Serialization.DataContractSet.Add(Type type)
   at System.Runtime.Serialization.XsdDataContractExporter.Export(Type type)
   at System.ServiceModel.Description.MessageContractExporter.ExportType(Type type, String partName, String operationName, XmlSchemaType& xsdType)
   at System.ServiceModel.Description.DataContractSerializerMessageContractExporter.ExportBody(Int32 messageIndex, Object state)
   at System.ServiceModel.Description.MessageContractExporter.ExportMessage(Int32 messageIndex, Object state)
   at System.ServiceModel.Description.MessageContractExporter.ExportMessageContract()
   at System.ServiceModel.Description.DataContractSerializerOperationBehavior.System.ServiceModel.Description.IWsdlExportExtension.ExportContract(WsdlExporter exporter, WsdlContractConversionContext contractContext)
   at System.ServiceModel.Description.WsdlExporter.CallExtension(WsdlContractConversionContext contractContext, IWsdlExportExtension extension)
   --- End of inner ExceptionDetail stack trace ---
   at System.ServiceModel.Description.WsdlExporter.CallExtension(WsdlContractConversionContext contractContext, IWsdlExportExtension extension)
   at System.ServiceModel.Description.WsdlExporter.CallExportContract(WsdlContractConversionContext contractContext)
   at System.ServiceModel.Description.WsdlExporter.ExportContract(ContractDescription contract)
   at System.ServiceModel.Description.WsdlExporter.ExportEndpoint(ServiceEndpoint endpoint, XmlQualifiedName wsdlServiceQName)
   at System.ServiceModel.Description.WsdlExporter.ExportEndpoints(IEnumerable`1 endpoints, XmlQualifiedName wsdlServiceQName)
   at System.ServiceModel.Description.ServiceMetadataBehavior.MetadataExtensionInitializer.GenerateMetadata()
   at System.ServiceModel.Description.ServiceMetadataExtension.EnsureInitialized()
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.InitializationData.InitializeFrom(ServiceMetadataExtension extension)
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.GetInitData()
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.TryHandleDocumentationRequest(Message httpGetRequest, String[] queries, Message& replyMessage)
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.ProcessHttpRequest(Message httpGetRequest)
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.Get(Message message)
   at SyncInvokeGet(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

服务代码看起来像......

namespace wcfFISH.StateManagement
{
    [DataContract(Namespace = "wcfFISH.StateManagement")]
    [KnownType(typeof(wcfFISH.StateManagement.C1FE.Approved))]
    [KnownType(typeof(wcfFISH.StateManagement.C1FE.Denied))]
    [KnownType(typeof(wcfFISH.StateManagement.C1FE.New))]
    [KnownType(typeof(wcfFISH.StateManagement.C1FE.Pending))]
    [KnownType(typeof(wcfFISH.StateManagement.Contractor.Authenticated))]
    [KnownType(typeof(wcfFISH.StateManagement.Contractor.New))]
    [KnownType(typeof(wcfFISH.StateManagement.CostDivision.Authenticated))]
    [KnownType(typeof(wcfFISH.StateManagement.CostDivision.New))]
    [KnownType(typeof(wcfFISH.StateManagement.ReportingPeriod.Closed))]
    [KnownType(typeof(wcfFISH.StateManagement.ReportingPeriod.Open))]
    public abstract class ObjectState
    {
        #region CONSTRUCTORS

        protected ObjectState()
        { }

        #endregion

        #region PROPERTIES & FIELDS

        #endregion

        #region EVENTS
        #endregion

        #region METHODS    
        #endregion
    }
}

边注…

我感到困惑的另一个原因是下面列出的原始声明从来没有引起过问题...它工作正常!这只发生在我添加CostDivision时!

[KnownType(typeof(wcfFISH.StateManagement.C1FE.New))]
[KnownType(typeof(wcfFISH.StateManagement.Contractor.New))]

如果我不清楚......

我的理解是WCF应该理解以下类之间的区别:

[KnownType(typeof(wcfFISH.StateManagement.Contractor.Authenticated))]
[KnownType(typeof(wcfFISH.StateManagement.Contractor.New))]
[KnownType(typeof(wcfFISH.StateManagement.CostDivision.Authenticated))]
[KnownType(typeof(wcfFISH.StateManagement.CostDivision.New))]

如果它不明白......

我想我唯一的选择似乎是将一切的层次结构扁平化为:

wcfFISH.StateManagement.Authenticated
wcfFISH.StateManagement.New

......这是我唯一的选择吗？(希望不是!)

Answer 1

我的通灵能力告诉我你的wcfFISH.StateManagement.CostDivision.New的声明是从wcfFISH.StateManagement.Contractor.New复制/粘贴的,当你改变了类名时你没有改变它的DataContract属性来匹配.