当有多条路由时，带有查询字符串的路由属性路由 [英] Route attribute routing with query strings when there are multiple routes

问题描述

我有这个:

[HttpGet]
[Route("Cats")]
public IHttpActionResult GetByCatId(int catId)

[HttpGet]
[Route("Cats")]
public IHttpActionResult GetByName(string name)

通过提供查询字符串来调用它们，例如 Cats?catId=5

They are called by providing the query string eg Cats?catId=5

然而，MVC Web API 会说你不能有多个相同的路由(两条路由都是Cats".

However MVC Web API will say you can't have multiple routes that are the same (both routes are "Cats".

我怎样才能让它工作，以便 MVC Web API 将它们识别为单独的路由?有什么我可以放入 Route 属性的东西吗?它说 ? 是一个可以放入路由的无效字符.

How can I get this to work so MVC Web API will recognize them as separate routes? Is there something I can put into the Route property? It says that ? is an invalid character to put into a route.

推荐答案

您可以将有问题的两个操作合二为一

You can merge the two actions in question into one

[HttpGet]
[Route("Cats")]
public IHttpActionResult GetCats(int? catId = null, string name = null) {

    if(catId.HasValue) return GetByCatId(catId.Value);

    if(!string.IsNullOrEmpty(name)) return GetByName(name);

    return GetAllCats();
}

private IHttpActionResult GetAllCats() { ... }

private IHttpActionResult GetByCatId(int catId) { ... }    

private IHttpActionResult GetByName(string name) { ... }

或者为了更灵活地尝试路由约束

Or for more flexibility try route constraints

引用 ASP.NET Web API 2 中的属性路由:路由约束

路线限制

路由约束让你限制路由中的参数模板匹配.一般语法是{parameter:constraint}".例如:

Route constraints let you restrict how the parameters in the route template are matched. The general syntax is "{parameter:constraint}". For example:

[Route("users/{id:int}"]
public User GetUserById(int id) { ... }

[Route("users/{name}"]
public User GetUserByName(string name) { ... }

这里，只有在id"段的情况下，才会选择第一条路线URI 是一个整数.否则，将选择第二条路线.

Here, the first route will only be selected if the "id" segment of the URI is an integer. Otherwise, the second route will be chosen.

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