c# - 基于抽象类公开 WCF 子类

Question

我有一个抽象类，我希望能够将其公开给 WCF，以便任何子类也可以作为 WCF 服务启动。
这是我到目前为止所拥有的：

[ServiceContract(Name = "PeopleManager", Namespace = "http://localhost:8001/People")]
[ServiceBehavior(IncludeExceptionDetailInFaults = true)]
[DataContract(Namespace="http://localhost:8001/People")]
[KnownType(typeof(Child))]
public abstract class Parent
{
    [OperationContract]
    [WebInvoke(Method = "PUT", UriTemplate = "{name}/{description}")]
    public abstract int CreatePerson(string name, string description);

    [OperationContract]
    [WebGet(UriTemplate = "Person/{id}")]
    public abstract Person GetPerson(int id);
}

public class Child : Parent
{
    public int CreatePerson(string name, string description){...}
    public Person GetPerson(int id){...}
}

尝试在我的代码中创建服务时，我使用此方法：

public static void RunService()
{
    Type t = typeof(Parent); //or typeof(Child)
    ServiceHost svcHost = new ServiceHost(t, new Uri("http://localhost:8001/People"));
    svcHost.AddServiceEndpoint(t, new BasicHttpBinding(), "Basic");
    svcHost.Open();
}

当使用 Parent 作为我得到的服务类型
The contract name 'Parent' could not be found in the list of contracts implemented by the service 'Parent'. 或 Service implementation type is an interface or abstract class and no implementation object was provided.

当使用 Child 作为我得到的服务类型时
The service class of type Namespace.Child both defines a ServiceContract and inherits a ServiceContract from type Namespace.Parent. Contract inheritance can only be used among interface types. If a class is marked with ServiceContractAttribute, then another service class cannot derive from it.

有没有办法在 Child 类中公开函数，这样我就不必专门添加 WCF 属性？

编辑
所以这个

[ServiceContract(Name= "WCF_Mate", Namespace="http://localhost:8001/People")]  
    public interface IWcfClass{}  

    public abstract class Parent : IWcfClass {...}  
    public class Child : Parent, IWcfClass {...}

使用 Child 返回启动服务
The contract type Namespace.Child is not attributed with ServiceContractAttribute. In order to define a valid contract, the specified type (either contract interface or service class) must be attributed with ServiceContractAttribute.

Answer 1

The service contract is usually an interface, not a class. Place your contract into an interface, have the abstract class implement this interface, and let us know what happens when you use Child to start the service.

Edit: Ok, now you need to modify your RunService method to this below. The contract type if IWcfClass, not Child or Parent.

public static void RunService()
{
        Type t = typeof(Child);
        ServiceHost svcHost = new ServiceHost(t, new Uri("http://localhost:8001/People"));
        svcHost.AddServiceEndpoint(typeof(IWcfClass), new BasicHttpBinding(), "Basic");
        svcHost.Open();
}