在ASP.NET Web API中找不到HTTP自定義異常

Question

我從此處使用此代碼源在我的應用程序中顯示帶有詳細錯誤消息的自定義404。 但是ActionSelector無法正常工作，並在請求中拋出null異常

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;
        }
    }

這是我的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;
        }
    }

看來SelectAction沒有將請求轉發給控制器？ 請幫忙

Answer 1

編輯：試試這個

    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
        }
    }