Question

所以我有一个实现CRUD的通用基本控制器，它来自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继承控制器继承：

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);
    }
}

这一切都很好用，直到我想覆盖像POST这样的方法。举个例子：

[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
    }

}

此时我收到错误：

"Multiple actions were found that match the request"

所以我的问题是，如何覆盖路线本身？我基本上希望我的新POST优先于通用的POST。我认为凭借隐藏的通用路线/方法，这只会起作用，但是我的想法是不正确的。

Answer 1

能够重新创建您的问题，通过试验和错误的过程能够通过使GenericController成为一个抽象类来实现它的工作

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
    }
}

Web API 2.2，具有路由覆盖的继承控制器（这可能）吗？

1 个答案: