属性路由不起作用[关闭]

Question

我正在 Visual Studio Express 2013 中创建一个 rest api。

我有 2 个控制器：一个用于订单，一个用于客户。

我已经创建了以下内容：

/api/clients获取所有客户端的信息

/api/clients/1 GET id = 1 的客户端信息

/api/orders/10 GET id = 10 的订单信息

现在，我想创建这个：

/api/clients/1/orders - 获取所有 id 为 1 的客户订单的信息

我已经阅读了有关属性路由的信息，但我无法使其工作。

OrdersController.cs

[EnableCors(origins: "*", headers: "*", methods: "*")]
public class OrdersController : ApiController
{
    public Order Get(string id)
    {
        // ...
    }

    [Route("clients/{id}/orders")]
    public List<Order> GetByClient(string id)
    {
        // ...
    }
}

WebApiConfig.cs

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Enable CORS
        config.EnableCors();

        //config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }
}

RouteConfig.cs

public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );
    }
}

像这样，所有其他请求都正常工作，但是当我尝试访问 /api/clients/1/orders 时，我收到错误 HTTP Error 404.0 - Not Found. The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.

但是，一旦我取消注释 config.MapHttpAttributeRoutes();，我就无法再访问任何请求 - 他们都返回：

<Error>
    <Message>An error has occurred.</Message>
<ExceptionMessage>
    The object has not yet been initialized. Ensure that HttpConfiguration.EnsureInitialized() is called in the application's startup code after all other initialization code.
</ExceptionMessage>
<ExceptionType>System.InvalidOperationException</ExceptionType>
<StackTrace>
    at System.Web.Http.Routing.RouteCollectionRoute.get_SubRoutes() at System.Web.Http.Routing.RouteCollectionRoute.GetRouteData(String virtualPathRoot, HttpRequestMessage request) at System.Web.Http.WebHost.Routing.HttpWebRoute.GetRouteData(HttpContextBase httpContext)
</StackTrace>
</Error>

我在这里做错了什么？

Answer 1

使用路由属性[Route("clients/{id}/orders")]，您应该使用/clients/1/orders 而不是/api/clients/1/orders url 访问操作GetByClient()。要拥有原始网址，只需修复路由：

[Route("api/clients/{id}/orders")]
public List<Order> GetByClient(string id)

Answer 2

取消注释您的 config.MapHttpAttributeRoutes() 行，然后在您的 Global.asax 文件中，替换：

WebApiConfig.Register(GlobalConfiguration.Configuration);

用这个：

GlobalConfiguration.Configure(WebApiConfig.Register);

你可以在这里阅读：

Attribute Routing in ASP.NET Web API 2