传递接口在WCF服务？ [英] Passing Interface in a WCF Service?

问题描述

我尝试用WCF服务，以及所遇到的一个问题，经过接口。

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

本作品：

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

但这并不：

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

当我尝试编译失败的GetInterface方法的客户端。我得到一个异常说，它不能转换为对象的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.

在客户方的IHomeService类正确实现的GetString一个字符串作为它的返回类型，但GetInterface具有对象的返回类型。为什么不是它的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

您需要告诉WCF序列化哪一个类使用序列化接口

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

[ServiceKnownType(typeof(ConcreteDeviceType)]

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