Question

这跟我提出的上一个问题有关：

我有一个定义Transaction类的DLL。它由WCF服务库和客户端应用程序引用。我收到错误声明服务库无法托管，因为它无法序列化DLL类。

这是服务代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using ServerLibrary.MarketService;
using SharedLibrary; // This is the DLL in question

namespace ServerLibrary
{
    [ServiceContract]
    public interface IService
    {
        [OperationContract]
        string GetData(int value);

        [OperationContract]
        CompositeType GetDataUsingDataContract(CompositeType composite);

        [OperationContract]
        bool ProcessTransaction(SharedLibrary.Transaction transaction);
    }

    [DataContract]
    public class CompositeType
    {
        bool boolValue = true;
        string stringValue = "Hello ";

        [DataMember]
        public bool BoolValue
        {
            get { return boolValue; }
            set { boolValue = value; }
        }

        [DataMember]
        public string StringValue
        {
            get { return stringValue; }
            set { stringValue = value; }
        }
    }
}

我是否必须使用[attribute]标题在此处标记Transaction类？

[UPDATE]

以下是我尝试托管此服务时收到的错误消息：

System.Runtime.Serialization.InvalidDataContractException：Type 'SharedLibrary.Transaction'无法序列化。考虑标记它使用DataContractAttribute属性，并标记其所有内容要使用DataMemberAttribute属性序列化的成员。如果类型是集合，请考虑使用 CollectionDataContractAttribute。请参阅Microsoft .NET Framework 其他支持类型的文档。在 System.Runtime.Serialization.DataContract.DataContractCriticalHelper.ThrowInvalidDataContractException（字符串消息，类型类型）at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.CreateDataContract（的Int32 id，RuntimeTypeHandle typeHandle，Type type）at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.GetDataContractSkipValidation（的Int32 id，RuntimeTypeHandle typeHandle，Type type）at System.Runtime.Serialization.XsdDataContractExporter.GetSchemaTypeName（类型输入） System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.ValidateDataContractType（类型输入） System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.CreatePartInfo（MessagePartDescription 部分，OperationFormatStyle风格， DataContractSerializerOperationBehavior serializerFactory）at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.CreateMessageInfo（DataContractFormatAttribute dataContractFormatAttribute，MessageDescription messageDescription， DataContractSerializerOperationBehavior serializerFactory）at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter..ctor（OperationDescription description，DataContractFormatAttribute dataContractFormatAttribute， DataContractSerializerOperationBehavior serializerFactory）at System.ServiceModel.Description.DataContractSerializerOperationBehavior.GetFormatter（OperationDescription 操作，布尔＆amp; formatRequest，Boolean＆amp; formatReply，Boolean isProxy）at System.ServiceModel.Description.DataContractSerializerOperationBehavior.System.ServiceModel.Description.IOperationBehavior.ApplyDispatchBehavior（OperationDescription 描述，DispatchOperation dispatch）at System.ServiceModel.Description.DispatcherBuilder.BindOperations（ContractDescription 合同，ClientRuntime代理，DispatchRuntime调度）at System.ServiceModel.Description.DispatcherBuilder.InitializeServiceHost（ServiceDescription description，ServiceHostBase serviceHost）at System.ServiceModel.ServiceHostBase.InitializeRuntime（）at System.ServiceModel.ServiceHostBase.OnBeginOpen（）at System.ServiceModel.ServiceHostBase.OnOpen（TimeSpan timeout）at System.ServiceModel.Channels.CommunicationObject.Open（时间跨度 System.ServiceModel.Channels.CommunicationObject.Open（）的超时）在Microsoft.Tools.SvcHost.ServiceHostHelper.OpenService（ServiceInfo 信息）

这里要求的是包含Transaction：

的DLL

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SharedLibrary
{
    // Transaction class to encapsulate products and checkout data
    public class Transaction
    {
            public int checkoutID;
            public DateTime time;
            public List<object> products; // Using object to avoid MarketService reference, remember to cast back!
            public double totalPrice;
            public bool complete;

            public Transaction(int ID)
            {
                checkoutID = ID;
            }

            public void Start()
            {
                products = new List<object>();
                complete = false;
            }

            public void Complete()
            {
                time = DateTime.Now;
                complete = true;
            }
        }
}

感谢。

Answer 1

我是否必须使用[attribute]标题在此处标记Transaction类？

不，你不应该这样做，但建议你这样做。请参阅Using Data Contracts。

问题是您在List<object>中传递派生对象。

您必须告诉服务使用ServiceKnownType属性处理哪些类型的对象：

[OperationContract]
[ServiceKnownType( typeof( MarketService.XXX ) )]
bool ProcessTransaction(SharedLibrary.Transaction transaction);

Answer 2

您可能希望将交易类定义如下

[DataContract]
[KnownType(typeof(MarketService.XXX))]
public class Transaction
{
}

我希望这会有所帮助。

在WCF服务中标记引用的库类

2 个答案: