如何传递List< Interface>在WCF？

问题描述

我有一个WCF服务，我试图在我的一个操作合同中返回一个List（IWatchable是我建立的自定义接口）。当我在客户端上测试服务时，该方法返回 object [] ，而不是 List< IWatchable> 即可。是否可以返回IWatchable列表，因为IWatchable是WCF的接口？

I have a WCF service where I am trying to return a List (where IWatchable is a custom interface I have built) in one of my operation contracts. When I test the service on the client the method returns an object[] instead of List<IWatchable>. Is it possible to return a List of IWatchable, since IWatchable is an interface with WCF?

方法：

public List<IWatchable> GetWorkload( Guid nodeId, int maximum )

IWatchable：

IWatchable:

public interface IWatchable
{
    string ActionName { get; set; }
    Guid ActionReference { get; set; }
}

希望更多信息有用......

Hopefully a bit more info will be helpful...

我有一个派生界面：

public interface IAMRAWatchable: IWatchable

来自的三个具体实现IAMRAWatchable ：

public class InstrumentationWatch: IAMRAWatchable
public class OutputWatch: IAMRAWatchable
etc...

在我的WCF方法中，返回 列表< IWatchable> 我想向客户端发送一个 InstrumentationWatch 和一个 OutputWatch ...这可能还是我要解决这个问题错误的方式？

In my WCF method that returns List<IWatchable> I want to send an InstrumentationWatch and an OutputWatch to the client... Is this possible or am I going about this the wrong way?

已解决

感谢John，我找到了解决方案。 KnownType 因为我使用 列表< IWatchable> - 所以我把我的列表包装到一个新类中并添加了属性。我需要重新考虑我的代码，但对于其他感兴趣的人来说是这个类：

Thanks to John I found my solution. KnownType wasn't working since I was using List<IWatchable> - So I wrapped my list into a new class and added the attributes to it. I'll need to re-factor my code but for others who are interested here is the class:

[DataContract]
[KnownType( typeof( InstrumentationWatch ) )]
[KnownType( typeof( OutputWatch ) )]
public class WorkInfo
{
    [DataMember]
    public List<IWatchable> WorkQueue { get; set; }
}

和我的WCF方法：

public WorkInfo GetWorkload( Guid nodeId, int maximum )

推荐答案

接口永远不能被序列化。它只是对行为的描述。

An interface can never be serialized. It is only a description of behavior.

您可以序列化实现该接口的对象，但您必须告诉WCF它们的类型是什么。请参阅。

You can serialize objects which implement the interface, but you must tell WCF what their types are. See Data Contract Known Types.

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