在 WCF 服务中传递接口? [英] Passing Interface in a WCF Service?

问题描述

我正在试验 WCF 服务，但遇到了传递接口的问题.

I'm experimenting with WCF Services, and have come across a problem with passing Interfaces.

这有效:

[ServiceContract]
public interface IHomeService
{
    [OperationContract]
    string GetString();
}

但这不会:

[ServiceContract]
public interface IHomeService
{
    [OperationContract]
    IDevice GetInterface();
}

当我尝试编译客户端时，它在 GetInterface 方法上失败.我收到一个异常，说它无法将 Object 转换为 IDevice.

When I try to compile the client it fails on the GetInterface method. I get an Exception saying that it can't convert Object to IDevice.

在客户端，IHomeService 类使用字符串正确实现 GetString 作为它的返回类型，但 GetInterface 具有对象的返回类型.为什么不是 IDevice?

On the clientside the IHomeService class correctly implements GetString with a string as it's returntype, but the GetInterface has a returntype of object. Why isn't it IDevice?

推荐答案

需要告诉WCF序列化器使用哪个类来序列化接口

You need to tell the WCF serializer which class to use to serialize the interface

[ServiceKnownType(typeof(ConcreteDeviceType)]

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