Web API 2.2，带有路由覆盖的继承控制器（这是否可能）？ [英] Web API 2.2, Inherited Controller with Route Overrides (Is this possible)?

问题描述

所以我有一个通用的基本控制器实现CRUD，它来源于 APIController 。

So I have a generic base controller implementing CRUD, which derives from 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();
    }

}

CustomDirectRouteProvider 如下：

config.MapHttpAttributeRoutes(new CustomDirectRouteProvider());

我的CustomDirectRouteProvider是：

Where my CustomDirectRouteProvider is:

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

这一切都很漂亮，直到我想覆写方法如POST。例如：

And this all works beautifully, until I want to override methods like POST. As an example:

[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
    }

}

此时会出现错误：

"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的POST优先于通用的。我想通过隐藏的通用路由/方法，这只是工作，但是唉，我在我的想法是不正确的。

So my question is, how can I override the route itself? I basically want my new POST to take precedence over the generic one. I thought by virtue of the generic route/method being hidden that this would just work, but alas I was incorrect in my thinking.

推荐答案

p>能够重现您的问题，通过试验和错误的过程能够使 GenericController 一个抽象类

Was able to recreate your issue, and through a process of trial and error was able to get it to work by making GenericController an abstract class

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 ，因为它们与继承的类匹配

and removing the attributes on the inherited action of the DerivedController as they matched the inherited class

[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
    }
}

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