在asp.net web api中動態修改action的名字

在路由設定中，我的路由是這樣的：

/api/{controller}/jqGrid/{action}/{id}

對於如下URL，預設情況下執行的是UserController類的List方法：

/api/User/jqGrid/List

而我希望凡是url中含有jqGrid的路由，都執行“jqGrid_{action}”名字的方法，即  jqGrid_List 方法。經過數天地折磨，終於解決了。上代碼（這裡照搬我在stackoverflow上的提問和我自己的回答了，英語高手歡迎指出文中不地道的英語，謝謝）：

First of all, I need to add a JqGridControllerConfiguration attribute to replace the default action selector applied to the controller with my one.

[JqGridControllerConfiguration]public class UserController : ApiController{    // GET: /api/User/jqGrid/List    [HttpGet]    public JqGridModel<User> jqGrid_List()    {        JqGridModel<User> result = new JqGridModel<User>();        result.rows = Get();        return result;    }}

Here's the code of JqGridControllerConfiguration:

1 public class JqGridControllerConfiguration : Attribute, IControllerConfiguration2 {3     public void Initialize(HttpControllerSettings controllerSettings, HttpControllerDescriptor controllerDescriptor)4     {5         controllerSettings.Services.Replace(typeof(IHttpActionSelector), new JqGridActionSelector());6     }7 }

in JqGridActionSelector, the "action" is modified if a "jqGrid/" exists in the request URL.

 1 public class JqGridActionSelector : ApiControllerActionSelector 2 { 3     public override HttpActionDescriptor SelectAction(HttpControllerContext controllerContext) 4     { 5         Uri url = controllerContext.Request.RequestUri; 6         if (url.Segments.Any(s => string.Compare(s, "jqGrid/", true) == 0)) 7         { 8             controllerContext.RouteData.Values["action"] = "jqGrid_" + controllerContext.RouteData.Values["action"].ToString(); 9         }10 11         return base.SelectAction(controllerContext);12     }13 }