CreatedAtRoute 路由到不同的控制器

本文介绍了CreatedAtRoute 路由到不同的控制器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在创建一个新的 webapi，使用属性路由来创建嵌套路由，如下所示:

I'm creating a new webapi using attribute routing to create a nested route as so:

// PUT: api/Channels/5/Messages [ResponseType(typeof(void))] [Route("api/channels/{id}/messages")] public async Task<IHttpActionResult> PostChannelMessage(int id, Message message) { if (!ModelState.IsValid) { return BadRequest(ModelState); } if (id != message.ChannelId) { return BadRequest(); } db.Messages.Add(message); await db.SaveChangesAsync(); return CreatedAtRoute("DefaultApi", new { id = message.Id }, message); }

但是我想返回一个没有嵌套的路由，即:

I however want to return a route that isn't nested i.e.:

/api/Messages/{id}

在消息控制器上定义.然而，上面的 CreatedAtRoute 调用并没有解析这个路由，而是抛出了.我做错了什么，或者它不支持路由到不同的 api 控制器?不详我试图命中的路线不是属性路线，只是默认路线.

which is defined on the messages controller. However The CreatedAtRoute call above is not resolving this route and instead throwing. Have I done something wrong, or does it not support routing to different api controller? n.b. the route I am trying to hit is not an attribute route, just a default one.

例外是:

消息:发生错误."ExceptionMessage: "UrlHelper.Link 不得返回 null."异常类型:System.InvalidOperationException"StackTrace: " 在 System.Web.Http.Results.CreatedAtRouteNegotiatedContentResult1.Execute() 在 System.Web.Http.Results.CreatedAtRouteNegotiatedContentResult1.ExecuteAsync(CancellationToken cancellingToken) 在 System.Web.Http.Controllers.ApiControllerActionInvoker.d__0.MoveNext() --- 从上一个抛出异常的位置开始的堆栈跟踪结束 --- 在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext() --- 从上一个位置开始的堆栈跟踪结束异常被抛出 --- 在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() 在 System.Web.Http.Dispatcher.HttpControllerDispatcher.d__0.MoveNext()"

Message: "An error has occurred." ExceptionMessage: "UrlHelper.Link must not return null." ExceptionType: "System.InvalidOperationException" StackTrace: " at System.Web.Http.Results.CreatedAtRouteNegotiatedContentResult1.Execute() at System.Web.Http.Results.CreatedAtRouteNegotiatedContentResult1.ExecuteAsync(CancellationToken cancellationToken) at System.Web.Http.Controllers.ApiControllerActionInvoker.d__0.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__0.MoveNext()"

如果它不支持这一点，返回 201 的规范方法是什么，我可以以重构安全的方式进行吗?

If it doesn't support this, what is the canonical way to return a 201 and can I do it in a refactor safe way?

推荐答案

哦，亲爱的，这可能是回答我自己问题的新记录.

Oh dear, this may be a new record for answering my own question.

return CreatedAtRoute("DefaultApi", new { controller = "messages", id = message.Id }, message);

可以解决问题.即明确指定控制器.我通过看到异常与 UrlHelper 相关并阅读其文档来解决这个问题...

does the trick. i.e. explicitly specifying the controller. I worked this our by seeing that the exception was related to the UrlHelper and reading its docs...