Web Api Route 註冊要放在 Mvc Route 註冊前

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今天想研究一下Web Api，寫了一個測試Api，開啟網站後瀏覽一下，可是卻提示找不到方法，剛開始以為哪裡配置錯了，可找了半天也沒見。

因為我是在一個現有Mvc網站做的Demo，所以打算建立一個Mvc網站，再試一下，新網站是正常的，對比一下Global檔案，發現WebApiConfig和RouteConfig順序不一樣。

如果把新網站的RouteConfig也放在WebApiConfig之前，同樣提示找不到方法。看來這兩個配置有關聯呀。

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1 2	WebApiConfig.Register(GlobalConfiguration.Configuration); RouteConfig.RegisterRoutes(RouteTable.Routes);

　　看了一下GlobalConfiguration類就明白了

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public static class GlobalConfiguration {     private static Lazy<HttpConfiguration> _configuration = new Lazy<HttpConfiguration>(delegate {         HttpConfiguration configuration = new HttpConfiguration(new HostedHttpRouteCollection(RouteTable.Routes));         configuration.Services.Replace(typeof(IAssembliesResolver), new WebHostAssembliesResolver());         configuration.Services.Replace(typeof(IHttpControllerTypeResolver), new WebHostHttpControllerTypeResolver());         configuration.Services.Replace(typeof(IHostBufferPolicySelector), new WebHostBufferPolicySelector());         return configuration;     });     public static HttpConfiguration Configuration     {         get         {             return _configuration.Value;         }     }          //... }

　　

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public class RouteConfig    {        public static void RegisterRoutes(RouteCollection routes)        {            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");              routes.MapRoute(                name: "Default",                url: "t/{controller}/{action}/{id}",                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }            );        }    }      public static class WebApiConfig    {        public static void Register(HttpConfiguration config)        {            config.Routes.MapHttpRoute(                name: "DefaultApi",                routeTemplate: "api/{controller}/{id}",                defaults: new { id = RouteParameter.Optional }            );        }    }

　　合并後的類似路由：

 1             routes.MapHttpRoute( 2                 name: "DefaultApi", 3                 routeTemplate: "api/{controller}/{id}", 4                 defaults: new { id = RouteParameter.Optional } 5             ); 6             routes.MapRoute( 7                 name: "Default", 8                 url: "{controller}/{action}/{id}", 9                 defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }10             );

 

如果順序反了，DefaultApi的路由就永遠匹配不到了，會一直找MVC的路由"{api}/{action}/{id}"。