ASP.NET MVC Url.Action 将当前路由值添加到生成的 url [英] ASP.NET MVC Url.Action adds current route values to generated url
问题描述
我在 SO 中多次看到这个问题，但没有一个给出任何可接受的答案:
I have seen this question a couple of times here in SO but none of them with any acceptable answer:
ASP.NET MVC @Url.Action 包含当前路由数据
ASP.NET MVC 隐式添加路由值
基本上我有一个控制器，它有一个名为 Group 的操作方法，它有一个重载，它不接收参数并显示一个元素列表，另一个重载接收一个 id 并显示该组的详细信息.
Basically I have Controller with an action method called Group, it has an overload that receives no parameters and displays a list of elements and another one that receives an id and displays details for that group.
如果我这样做:
Url.Action("Group", "Groups");
从网站的主页 (/) 返回这样的网址:
From the main page of the site (/) it returns an url like this:
"mysite.com/Groups/Group"
没关系现在，如果站点的当前地址是/Groups/Group/1我调用相同的方法
which is alright Now, if the current address of the site is /Groups/Group/1 And I call the same method
Url.Action("Group", "Groups");
返回的网址是这样的:
"mysite.com/Groups/Group/1"
生成 URL 时自动添加当前页面的路由值.即使我以这种方式生成 URL:
It automatically adds the value of the route for the current page when generating the URL. Even if I generate the URL this way:
Url.Action("Group", "Groups", null);
因此明确指定我不想要任何路由值，生成的 URL 是相同的.要获取我想要的地址，我必须将路由值显式设置为空字符串，如下所示:
Thus explicitly specifying that I don't want any route values, the generated URL is the same. To get the address I want I have to explicitly set the route value to an empty string, like so:
Url.Action("Group", "Groups", new {id=""});
这将生成以下网址:
"mysite.com/Groups/Group"
我的问题是，为什么会发生这种情况?如果我没有设置任何路由值，它就不应该将它们添加到生成的 URL 中.
My question is, why does this happen? If I don't set any route values it shouldn't add them to the generated URL.
推荐答案
Url.Action 将重用当前的请求参数，如果你没有明确设置它们.它是在出站 url 匹配算法中设计的.在生成url的过程中查找路由数据参数时，参数取自:
Url.Action will reuse the current request parameters, if you do not explicitly set them. It is by design in outbound url-matching algorithm. When looking for the route data parameters in a process of generating url, parameters are taken from:
1) 明确提供的值
2) 来自当前请求的值
2) values from the current request
3) 默认值
按照我上面指定的顺序.
In the order I specified above.
路由的出站匹配算法很复杂，因此像您在示例中所做的那样，显式设置请求的所有参数是一种很好的做法
Outbound matching algorithm for routes is complicated, so it is good practice to explicitly set all parameters for request, as you did in your example
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