c# - Web API 2.2，具有路由覆盖的继承 Controller (这可能吗)？

Question

所以我有一个实现 CRUD 的通用基础 Controller ，它派生自 APIController。

public class GenericController<TEntity> : ApiController where TEntity : class {

    private readonly GenericModel<TEntity> _model;

    public IModel Model {
        get { return _model; }
    }

    public GenericController(IGenericModel<TEntity> model) {
        _model = (GenericModel<TEntity>)model;
    }

    [HttpPost, Route]
    public IHttpActionResult Post(TEntity entity) {
        TEntity newEntity = _model.Create(entity);
        String urlLink = $"{Request.RequestUri}{RequestContext.VirtualPathRoot}{((IGenericEntity)newEntity).ID}";
        return Created(urlLink, newEntity);
    }

    [HttpGet, Route]
    public IHttpActionResult GetList() {
        return Ok(_model.ReadList());
    }

    [HttpGet, Route("{ID:int}")]
    public IHttpActionResult Get(Int64 ID) {
        return Ok(_model.Read(ID));
    }

    [HttpPut, Route]
    public IHttpActionResult Put(TEntity entity) {
        _model.Update(entity);
        return Ok();
    }

    [HttpDelete, Route("{ID:int}")]
    public IHttpActionResult Delete(Int64 ID) {
        _model.Delete(ID);
        return Ok();
    }

}

并允许通过 CustomDirectRouteProvider 继承 Controller :

config.MapHttpAttributeRoutes(new CustomDirectRouteProvider());

我的 CustomDirectRouteProvider 在哪里:

public class CustomDirectRouteProvider : DefaultDirectRouteProvider {
    protected override IReadOnlyList<IDirectRouteFactory> GetActionRouteFactories(HttpActionDescriptor actionDescriptor) {
        return actionDescriptor.GetCustomAttributes<IDirectRouteFactory> (inherit: true);
    }
}

在我想覆盖像 POST 这样的方法之前，这一切都很好地工作。例如:

[RoutePrefix(@"api/Test")]
public class DerivedController : GenericController<ConcreteEntity> {

    public DerivedController (IGenericModel<ConcreteEntity> model) : base(model) {
    }

    [HttpPost, Route]
    public new IHttpActionResult Post(ConcreteEntity entity) {
        //New Post Functionality Here
    }

}

此时我得到了错误:

"Multiple actions were found that match the request"

所以我的问题是，如何覆盖路由本身？我基本上希望我的新 POST 优先于通用 POST。我认为由于隐藏了通用路由/方法，这会起作用，但可惜我的想法不正确。

Answer 1

能够重现您的问题，并且通过反复试验的过程能够通过将 GenericController 设为抽象类来使其正常工作

public abstract class GenericController<TEntity> : ApiController where TEntity : class {

    [HttpPost, Route]
    public virtual IHttpActionResult Post(TEntity entity) {
        TEntity newEntity = _model.Create(entity);
        String urlLink = $"{Request.RequestUri}{RequestContext.VirtualPathRoot}{((IGenericEntity)newEntity).ID}";
        return Created(urlLink, newEntity);
    }
}

并删除 DerivedController 的继承操作的属性，因为它们与继承的类匹配

[RoutePrefix(@"api/Test")]
public class DerivedController : GenericController<ConcreteEntity> {

    public DerivedController (IGenericModel<ConcreteEntity> model) : base(model) {
    }

    public override IHttpActionResult Post(ConcreteEntity entity) {
        //New Post Functionality Here
    }
}