C# MVC 4 Web API 中的 URL 参数
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URL parameters in MVC 4 Web API
提问by pavel.baravik
Let say I have two methods in MVC 4 Web API controller:
假设我在 MVC 4 Web API 控制器中有两种方法：
public IQueryable<A> Get() {}
And
和
public A Get(int id) {}
And the following route:
以及以下路线：
routes.MapHttpRoute(
name: "Default",
routeTemplate: "{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
This works as expected. Adding a one more parameter, e.g.:
这按预期工作。添加一个更多的参数，例如：
public IQueryable<A> Get(int p) {}
public A Get(int id, int p) {}
leads to the situation when MVC returns 404 for the following request:
导致MVC针对以下请求返回404的情况：
GET /controller?p=100
Or
或者
GET /controller/1?p=100
with message "No action was found on the controller 'controller' that matches the request"
带有消息“未在与请求匹配的控制器‘控制器’上找到任何操作”
I expect that URL parameters should be wired by MVC without issues, but it is not true. Is this a bug or my misunderstanding of how MVC maps request to action?
我希望 MVC 应该没有问题地连接 URL 参数，但事实并非如此。这是错误还是我对 MVC 如何将请求映射到操作的误解？
采纳答案by Shiv Kumar
If you think about what you're attempting to do and the routes you're trying, you'll realize that the second parameter "p" in your case, needs to be marked as an optional parameter as well.
如果您考虑一下您正在尝试执行的操作以及您正在尝试的路由，您会意识到在您的情况下，第二个参数“p”也需要标记为可选参数。
that is your route should be defined like so:
那是你的路线应该像这样定义：
routes.MapHttpRoute(
name: "Default",
routeTemplate: "{controller}/{id}/{p}",
defaults: new { id = RouteParameter.Optional, p = RouteParameter.Optional });
Once you do this, the URL
执行此操作后，URL
/controller?p=100 will map to your
/controller?p=100 将映射到您的
public IQueryable<A> Get(int p) {}
method and a URL like so:
方法和一个像这样的 URL：
/controller/1?p=100
will map to your
将映射到您的
public A Get(int id, int p) {}
method, as you expect.
方法，如您所料。
So to answer your questions....no this is not a bug but as designed/expected.
所以回答你的问题......不，这不是一个错误，而是设计/预期的。
回答by Bajju
In the WebApiConfig add new defaults to the httproute
在 WebApiConfig 中向 httproute 添加新的默认值
RouteParameter.Optional for the additional routes did not work for me
RouteParameter.Optional 附加路由对我不起作用
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}/{voucher}",
defaults: new { id = RouteParameter.Optional ,defaultroute1="",defaultroute2=""}
);
