WCF 异常：无法添加到已知类型列表

Question

大家好...

我收到一个意外的 WCF 错误，抱怨“已知类型”的名称相似，但名称空间不同（请参阅下面的错误）。

...请记住，我仍在尝试所有这些。

还有……

我已经了解常规 Web 服务的性质会迫使您扁平化对象层次结构，但我所读到的所有内容都表明您不必使用 WCF 来执行此操作……这就是我尝试这样做的原因。

所以我的问题是……

• 问：是否可以告诉 WCF 不要忽略 名称间距？
• 问：我是否缺少标签？不要 WCF 标签（下）采用名称间距 帐号？
• 问：我是否必须展平我的对象 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 因为另一种类型 'wcfFISH.StateManagement.CostDivision.New' 具有相同的数据合同名称 'wcfFISH.StateManagement.Contractor:New' 已经存在了。

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
    }
}

旁注……

我感到困惑的另一个原因是下面列出的原始声明从未引起问题......而且它工作正常！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应该明白以下类的区别：

[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所有事物的层次结构扁平化为：

wcfFISH.StateManagement.Authenticated
wcfFISH.StateManagement.New

……这是我唯一的选择吗？ （希望不会！）

Answer 1

我的精神力量告诉我，您的 wcfFISH.StateManagement.CostDivision.New 声明是从 wcfFISH.StateManagement.Contractor.New 复制/粘贴的，当您更改类名时，您没有更改其上的 DataContract 属性以匹配.