使用基类作为WCF服务的参数

我有一个多项目解决方案。 One Project提供了一个包含多个类的DLL。

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

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

在我的WCF服务中，我有我的界面：

  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，我收到一个错误，告诉我序列化worker类时出现问题。

所以我想这是因为服务在序列化基类时确实存在问题，而是获取inheritance类。 但是如何轻松解决这个问题？

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

错误消息告诉您该怎么做：

InnerException消息是“Type”DV_BII30.ExecSQLWorker’，数据协定名称为“ExecSQLWorker： http ： //schemas.datacontract.org/2004/07/DV_BII30 ”，不是预期的。 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：不希望输入数据协定名称为“ExecSQLWorker： http ： //schemas.datacontract.org/2004/07/DV_BII30 ”的“DV_BII30.ExecSQLWorker”。 如果您正在使用DataContractSerializer或者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。

您有几种可能性来解决此问题。

1. 将KnownTypeAttribute添加到WorkerTemplate类

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

2. 如果您可以更改IPQWService界面，请查看此处

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。 但您必须将解析程序添加到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() .DataContractResolver = new SharedTypeResolver(); }