ApiController扩展方法 – 无法访问ResponseMessage

我想为ApiController创建扩展方法，以便能够返回自定义内容。
我的想法是用我自己的细节返回自定义错误。 我想返回类似于OAuthAuthorizationServerProvider返回的错误的自定义错误：

 { "error": "invalid_grant", "error_description": "You have 3 more attempts before Your account will be locked." } 

在我的ApiController里面我添加了这个方法：

 public IHttpActionResult Test() { HttpError err = new HttpError(); err["error"] = "40001"; err["error_description"] = "Something is wrong"; var response = Request.CreateErrorResponse(HttpStatusCode.NotFound, err); return ResponseMessage(response); } 

这让我看起来很好看：

 { "error": "40001", "error_description": "Somethis is wrong" } 

我尝试将此转换为以下扩展方法：

 public static class ApiControllerExtensions { public static IHttpActionResult BadRequest(this ApiController apiController, string error, string errorDetails) { HttpError err = new HttpError(); err["error"] = error; err["error_description"] = errorDetails; var response = apiController.Request.CreateErrorResponse(HttpStatusCode.NotFound, err); return apiController.ResponseMessage(response); } } 

但是我收到错误： Cannot access protected internal method 'ResponseMessage' here

我知道我可以创建自定义基础ApiController并在那里添加该方法，但我想创建扩展方法，以便在其他项目中重用它更容易。

如何从ApiController扩展方法返回IHttpActionResult？

Answer 1

我已设法修复我的扩展方法。
而不是return apiController.ResponseMessage(response)我添加了return new ResponseMessageResult(response)

以下是工作扩展方法：

 public static class ApiControllerExtensions { public static IHttpActionResult InvalidRequest(this ApiController apiController, string error, string errorDetails = "", ModelStateDictionary modelState = null) { var err = modelState != null ? new HttpError(modelState, false) : new HttpError(); if (err.ContainsKey("message")) err.Remove("message"); err["error"] = error; if (!string.IsNullOrWhiteSpace(errorDetails)) err["error_description"] = errorDetails; var response = apiController.Request.CreateErrorResponse(HttpStatusCode.BadRequest, err); return new ResponseMessageResult(response); } public static IHttpActionResult InvalidRequest(this ApiController apiController, string error, ModelStateDictionary modelState = null) { return InvalidRequest(apiController, error, null, modelState); } } 

和示例用法看起来像这样：

 return this.InvalidRequest("error") return this.InvalidRequest("error","error details") var msd = new ModelStateDictionary(); msd.AddModelError("name", "name not valid"); return this.InvalidRequest("error",msd); return this.InvalidRequest("error","details",msd); 

返回JSON（400 Bad Request）看起来像这样：

 { "error": "error", "modelState": { "name": [ "name not valid" ] }, "error_description": "details" }