Web API 2中具有MVC 5 AttributeRouting的QueryString [英] QueryString with MVC 5 AttributeRouting in Web API 2

问题描述

我有以下代码

[HttpGet] 
[Route("publish/{id}")] 
public IHttpActionResult B(string id, string publishid=null) { ... }

据我了解，

~/..../publish/1?publishid=12
~/..../publish?id=1&publishid=12

应该工作并绑定两个参数，但在第二种情况下将不工作. 在第一种情况下，publishid将不受约束.

Should work and bind both parameters but it won't work on the second case. In the first case, publishid will not be bound.

所以我不明白为什么这不起作用.知道为什么会这样吗?

So I do not understand why this is not working. Any idea why it is in this way?

推荐答案

第二种情况不起作用，因为id是路由模板publish/{id}中的必需变量.在Web API中，首先进行路由模板匹配，然后进行操作选择过程.

The second case will not work because id is a required variable in the route template publish/{id}. In Web API first route template matching happens and then the action selection process.

其他情况:

1. publish/1-将不起作用，因为操作B表示需要publishid.为防止这种情况，您可以将动作签名更改为B(string id, string publishid=null)之类，并且仅绑定id
2. publish/1?publishid=10-两者均受约束的地方正常工作.

1. publish/1 - will not work as action B is saying that publishid is required. To prevent this you can change the signature of action to be something like B(string id, string publishid=null) and only id is bound
2. publish/1?publishid=10 - works as expected where both are bound.

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