c# - 数据契约已知类型和一组相互继承的接口(interface)

Question

我开发(重写到 WCF)一个接受 string[] 并返回 ISection[] 的文件解析 Web 服务，但实际上这是一组嵌套接口(interface):

namespace Project.Contracts // Project.Contracts.dll
{
    public interface ISection { }

    public interface ISummarySection : ISection { }

    public interface IDataSection : ISection { }
}

和类:

namespace Project.Format.A // Project.Format.A.dll
{
    [DataContract]
    public class SummarySectionFormatA : ISummarySection { }

    [DataContract]
    public class DataSectionFormatA : IDataSection { }
}

服务接口(interface)及其实现:

[ServiceContract]
public interface IService // Project.Contracts.dll
{
    ISection[] Parse(string format, string[] data);
} 

[ServiceKnownType(typeof(SummarySectionFormatA))] // tried this also
[ServiceKnownType(typeof(DataSectionFormatA))]
public class Service : IService // Project.Service.dll
{
    public ISection[] Parse(string format, string[] data)
    {
        return Factory.Create(format).Parse(data);
    }
}

我尝试在服务器和客户端上配置 declaredTypes:

<system.runtime.serialization>
  <dataContractSerializer>
    <declaredTypes>
      <add type="Project.Contracts.ISumarySection, Project.Contracts">
        <knownType type="Project.Format.A.SummarySectionFormatA, Project.Format.A" />
      </add>
      <add type="Project.Contracts.IDataSection, Project.Contracts">
        <knownType type="Project.Format.A.DataSectionFormatA, Project.Format.A" />
      </add>
    </declaredTypes>
  </dataContractSerializer>
</system.runtime.serialization>

但还是报同样的错误:

"Type 'DataSectionFormatA' with data contract name 'DataSection:http://schemas.example.com/Parse' is not expected.

或

The underlying connection was closed: The connection was closed unexpectedly.

我无法使用 KnownTypeAttribute 修饰接口(interface)，因为 Contracts 项目不引用 Format 项目，引用会破坏设计。这就是我要使用配置的原因。

Answer 1

看看下面的代码

[ServiceContract]
[ServiceKnownType(typeof(SummarySectionFormatA))]
[ServiceKnownType(typeof(DataSectionFormatA))]
public interface IService {}

public class Service : IService {}