asp.net MVC路由配置

Question

我有一个 ASP.Net MVC 应用程序，其中包含以下路由配置规则：

routes.MapRoute(
        "rule1",
    "{controller}/{action}/{cid}/{language}/{itemID}/{uid}",
    new { controller = "Home", action = "action1" }
    , new[] { "MVCApp.Controllers" }
);

我刚刚添加了具有相同数量参数的新操作，我的路由配置更改如下（添加了规则 2）：

routes.MapRoute(
        "rule2",
    "{controller}/{action}/{cid}/{language}/{phoneNumber}/{uid}",
    new { controller = "Home", action = "action2" }
    , new[] { "MVCApp.Controllers" }
);
routes.MapRoute(
        "rule1",
    "{controller}/{action}/{cid}/{language}/{itemID}/{uid}",
    new { controller = "Home", action = "action1" }
    , new[] { "MVCApp.Controllers" }
);

现在当我调用 http://localhost:51650/Home/action2/1/en/1/1 它不会路由到 action1 并抛出异常 The parameters dictionary contains a null entry for parameter 'itemID' of non-nullable type 'System.Int64' for method 'System.Web.Mvc.JsonResult action1(System.String, Int32, Int64, Int64).

Answer 1

您必须先声明规则 1，然后声明规则 2。声明路由的顺序对 api 很重要，一旦请求匹配路由，api 将停止搜索路由并转到指定的控制器。

这来自 Pro ASP.NET Web API 本书：

Depending on your needs, you might want to have multiple Web API routes in your application. This is a totally acceptable option in ASP.NET Web API, but there are a few important things to be aware of. If you have multiple routes, the registration order of the routes matters. When a request comes to the routing level, the route collection is scanned to find a match. As soon as a match is found, the search stops, and the remaining routes get ignored. The first route registered will be looked at first, and so on.

所以由于你的两条路由参数个数相同，所以在第一个符合请求参数个数的路由上退出。要解决这个问题，您可以在路由中添加约束，这样您就可以确保将什么值传递给什么路由，或者将您的路由硬编码到 rule1 中的 action1 和将 action2 硬编码到 rule2，如@Pavel 所述。

对于将 rule1 始终路由到 action1 并将 rule2 始终路由到 actoin2 的操作硬编码，请使用：{controller}/action1/{cid}/{language}/{itemID}/{uid} 用于 action1 并为 action2 和 rule2 执行相同操作

asp.net MVC路由配置

asp.net MVC routing configuration

c#

asp.net-mvc

routing

url-routing

asp.net-mvc-routing