使用基类作为 WCF 服务的参数

Question

我有一个多项目解决方案。 一个项目正在提供一个包含多个类的 DLL。

其中一个类是WorkerTemplate。另外两个类继承自它，即ExecSQLWorker 和CopyWorker

class ExecSQLWorker : WorkerTemplate {};
class CopyWorker: WorkerTemplate {};

在我的 WCF 服务中，我的界面是这样的：

 public interface IPQWService
 {
     [OperationContract]
     void EnqueueWorker(WorkerTemplate[] worker);
 }

现在在我的客户端应用程序中，WorkerTemplate[] 由 ExecSQLWorker 和 CopyWorker 对象组成。当我现在尝试调用 EnqueueWorker(worker) 方法时，我收到一条错误消息，告诉我序列化工作类时出现问题。

所以我猜这是因为该服务在序列化基类时确实存在问题，而是获得了继承类。但是如何轻松解决这个问题呢？

编辑：例外：

Unhandled Exception: System.ServiceModel.CommunicationException: There was an error while trying to serialize parameter http://tempuri.org/:worker. The InnerException message was 'Type 'DV_BII30.ExecSQLWorker' with data contract name 'ExecSQLWorker:http://schemas.datacontract.org/2004/07/DV_BII30' is not expected. Consider using a DataContractResolver if you are using DataContractSerializer or add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to the serializer.'.  Please see InnerException for more details. ---> System.Runtime.Serialization.SerializationException: Type 'DV_BII30.ExecSQLWorker' with data contract name 'ExecSQLWorker:http://schemas.datacontract.org/2004/07/DV_BII30' is not expected. Consider using a DataContractResolver if you are using DataContractSerializer or add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to the serializer.
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeAndVerifyType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, Boolean verifyKnownType, RuntimeTypeHandle declaredTypeHandle, Type declaredType)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithXsiType(XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle objectTypeHandle, Type objectType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle, Type declaredType)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)
   at WriteArrayOfWorkerTemplateToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract )
   at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObject(XmlDictionaryWriter writer, Object graph)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameterPart(XmlDictionaryWriter writer, PartInfo part, Object graph)
   --- End of inner exception stack trace ---

Server stack trace:
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameterPart(XmlDictionaryWriter writer, PartInfo part, Object graph)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameter(XmlDictionaryWriter writer, PartInfo part, Object graph)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameters(XmlDictionaryWriter writer, PartInfo[] parts, Object[] parameters)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeBody(XmlDictionaryWriter writer, MessageVersion version, String action, MessageDescription messageDescription, Object returnValue, Object[] parameters, Boolean isRequest)
   at System.ServiceModel.Dispatcher.OperationFormatter.SerializeBodyContents(XmlDictionaryWriter writer, MessageVersion version, Object[] parameters, Object returnValue, Boolean isRequest)
   at System.ServiceModel.Dispatcher.OperationFormatter.OperationFormatterMessage.OperationFormatterBodyWriter.OnWriteBodyContents(XmlDictionaryWriter writer)
   at System.ServiceModel.Channels.BodyWriterMessage.OnWriteBodyContents(XmlDictionaryWriter writer)
   at System.ServiceModel.Channels.Message.OnWriteMessage(XmlDictionaryWriter writer)
   at System.ServiceModel.Channels.BufferedMessageWriter.WriteMessage(Message message, BufferManager bufferManager, Int32 initialOffset, Int32 maxSizeQuota)
   at System.ServiceModel.Channels.TextMessageEncoderFactory.TextMessageEncoder.WriteMessage(Message message, Int32 maxMessageSize, BufferManager bufferManager, Int32 messageOffset)
   at System.ServiceModel.Channels.HttpOutput.SerializeBufferedMessage(Message message, Boolean shouldRecycleBuffer)
   at System.ServiceModel.Channels.HttpOutput.Send(TimeSpan timeout)
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.SendRequest(Message message, TimeSpan timeout)
   at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at DV_BII30.ServiceReference1.IPQWService.EnqueueWorker(WorkerTemplate[] worker)
   at DV_BII30.Program.Main(String[] args) in C:\TFS\robert.hartmann\PCO\Features\CDW5.0 Prototyping\Sources\DTSx\DataVault_Staging_CDW\DV_BII30\Program.cs:line 119

Answer 1

错误信息告诉你该怎么做：

不应出现 InnerException 消息为“类型 'DV_BII30.ExecSQLWorker'，数据合同名称为“ExecSQLWorker:http://schemas.datacontract.org/2004/07/DV_BII30”。如果您正在使用 DataContractSerializer 或将任何静态未知的类型添加到已知类型列表中，请考虑使用 DataContractResolver - 例如，通过使用 KnownTypeAttribute 属性或将它们添加到传递给序列化程序的已知类型列表中。有关更多详细信息，请参阅 InnerException。 ---> System.Runtime.Serialization.SerializationException：不应使用数据合同名称“ExecSQLWorker:http://schemas.datacontract.org/2004/07/DV_BII30”键入“DV_BII30.ExecSQLWorker”。如果您使用 DataContractSerializer 或将任何静态未知的类型添加到已知类型列表中，请考虑使用 DataContractResolver - 例如，通过使用 KnownTypeAttribute 属性或将它们添加到传递给序列化程序的已知类型列表中。

你有几种可能解决这个问题。

1. 将KnownTypeAttribute 添加到您的WorkerTemplate 类中

   [DataContract]
   [KnownType(typeof(ExecSQLWorker))]
   [KnownType(typeof(CopyWorker))]
   public class WorkerTemplate
   {
       //Properties and stuff
   }
   

2. 如果可以改IPQWService接口，看看here

3. 您可以使用DataContractResolver

   public class SharedTypeResolver : DataContractResolver
   {
       public override bool TryResolveType(Type dataContractType, Type declaredType, DataContractResolver knownTypeResolver, out XmlDictionaryString typeName, out XmlDictionaryString typeNamespace)
       {
           if (!knownTypeResolver.TryResolveType(dataContractType, declaredType, null, out typeName, out typeNamespace))
           {
               XmlDictionary dictionary = new XmlDictionary();
               typeName = dictionary.Add(dataContractType.FullName);
               typeNamespace = dictionary.Add(dataContractType.Assembly.FullName);
           }
       }
   
       public override Type ResolveName(string typeName, string typeNamespace, Type declaredType, DataContractResolver knownTypeResolver)
       {
           return knownTypeResolver.ResolveName(typeName, typeNamespace, declaredType, null) ?? Type.GetType(typeName + ", " + typeNamespace);
       }
   }
   

   解析器接受您在服务中使用的每种类型。但是您必须将解析器添加到您的客户端端点和服务器端点。像这样：

   Host = new ServiceHost(typeof(MyService));
   
   ContractDescription cd = Host.Description.Endpoints[0].Contract;
   foreach (var operation in cd.Operations)
   {
       operation.Behaviors.Find<DataContractSerializerOperationBehavior>()
               .DataContractResolver = new SharedTypeResolver();
   }