请教一个wcf的问题

Question

如果方法返回IList<object>这样的数据 ，要求在接口方法上添加
[ServiceKnownType(typeof(XXX))]不知道我说法正确不？   
目前有个问题，因为这个返回IList<object>的函数可能有很多种类型，接口方法上加上了
很多[ServiceKnownType(typeof(XXX))]
如：
[OperationContract]
[ServiceKnownType(typeof(AAA))]
[ServiceKnownType(typeof(BBB))]
[ServiceKnownType(typeof(CCC))]
IList<object> GetSomeData();像上面这个写法有没有更好的替代方式啊？感觉这样会写上很多ServiceKnownType

Answer 1

面向服务就应该要表明提供什么服务，不要你要在.net下用的话，也可以。
using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;
using System.Xml;namespace NetContract
{
    public class NetDataContractAttribute : Attribute, IOperationBehavior
    {
        public void AddBindingParameters(OperationDescription description, BindingParameterCollection parameters)
        {
        }
        public void ApplyClientBehavior(OperationDescription description, ClientOperation proxy)
        {
            ReplaceDataContractSerializerOperationBehavior(description);
        }
        public void ApplyDispatchBehavior(OperationDescription description, DispatchOperation dispatch)
        {
            ReplaceDataContractSerializerOperationBehavior(description);
        }
        public void Validate(OperationDescription description)
        {
        }        private static void ReplaceDataContractSerializerOperationBehavior(OperationDescription description)
        {
            DataContractSerializerOperationBehavior dcsOperationBehavior = description.Behaviors.Find<DataContractSerializerOperationBehavior>();
            if (dcsOperationBehavior != null)
            {
                description.Behaviors.Remove(dcsOperationBehavior);
                description.Behaviors.Add(new NetDataContractSerializerOperationBehavior(description));
            }
        }
        public class NetDataContractSerializerOperationBehavior : DataContractSerializerOperationBehavior
        {
            public NetDataContractSerializerOperationBehavior(OperationDescription operationDescription) : base(operationDescription)
            {
            }
            public override XmlObjectSerializer CreateSerializer(Type type, string name, string ns, IList<Type> knownTypes)
            {
                return new NetDataContractSerializer();
            }
            public override XmlObjectSerializer CreateSerializer(Type type, XmlDictionaryString name, XmlDictionaryString ns, IList<Type> knownTypes)
            {
                return new NetDataContractSerializer();
            }
        }
    }
}用这段代码后，在domain中的类就不用加[DataContract]
在接口上加 [NetDataContract]
public interface IBaseServer
    {
        [OperationContract(Name = "1")]
        [NetDataContract]
        IList GetList(string statementname, object dataobject);
    }

Answer 2

接口类上要声明[ServiceContract]