在asp.net web API中找不到HTTP自定义异常

Question

我正在使用here中的此代码源在我的应用程序中显示带有详细错误消息的自定义404。 但ActionSelector不起作用，并在请求

中抛出null异常

public class HttpNotFoundAwareControllerActionSelector : ApiControllerActionSelector
    {
        public HttpNotFoundAwareControllerActionSelector()
        {
        }

        public override HttpActionDescriptor SelectAction(HttpControllerContext controllerContext)
        {
            HttpActionDescriptor decriptor = null;
            try
            {
                decriptor = base.SelectAction(controllerContext);
            }
            catch (HttpResponseException ex)
            {
                var code = ex.Response.StatusCode;
                if (code != HttpStatusCode.NotFound && code != HttpStatusCode.MethodNotAllowed)
                    throw;
                var routeData = controllerContext.RouteData;
                routeData.Values["action"] = "Handle404";
                IHttpController httpController = new ErrorController();
                controllerContext.Controller = httpController;
                controllerContext.ControllerDescriptor = new HttpControllerDescriptor(controllerContext.Configuration, "Error", httpController.GetType());
                decriptor = base.SelectAction(controllerContext);
            }
            return decriptor;
        }
    }

这是我的HttpError控制器

public class ErrorController : ApiController
    {
        [HttpGet, HttpPost, HttpPut, HttpDelete, HttpHead, HttpOptions, AcceptVerbs("PATCH")]
        public HttpResponseMessage Handle404()
        {
            HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.NotFound, Logger.ConditionWarning("Invalid API Request - 404 Not Found"));
            return response;
        }
    }

似乎SelectAction没有将请求转发给控制器？请帮忙

Answer 1

编辑：试试这个

    public class ErrorController : ApiController
    {
        [HttpGet, HttpPost, HttpPut, HttpDelete, HttpHead, HttpOptions, AcceptVerbs("PATCH")]
        public HttpResponseMessage Handle404()
        {
            HttpResponseMessage message = new HttpResponseMessage(HttpStatusCode.NotFound);
            message.Content = new ObjectContent(typeof(HttpResponseMessage), Logger.ConditionWarning("Invalid API Request - 404 Not Found"), GlobalConfiguration.Configuration.Formatters.JsonFormatter);
            return message
        }
    }