我在控制器中使用MVC5的属性路由。
有没有办法控制控制器之间的属性路由优先级?
考虑以下
[Route("home/{action=index}/{username?}")]
public class HomeController : Controller
{
[Route("home/index/{username?}", Order = 1)]
[Route("home/{username?}", Order = 2)]
[Route("{username?}", Order = 3)]
public ActionResult Index()
{
// ... bunch of stuff
}
}
基于上面的代码,应使用以下请求调用HomeController.Index()
操作方法:
第二个控制器:
[Authorize(Roles = "Member")]
[Route("profile/{action=index}")]
public class ProfileController : Controller
{
[Route("profile")]
public ActionResult Index()
{
}
}
应使用以下请求调用ProfileController.Index()
。
从示例中,如果我在网址中发送domain/profile
,则会引发歧义异常。似乎domain/{username}
和domain/profile
之间存在歧义。
现在,如果我使用基于约定的路由,这将有效(首次匹配获胜)。但它可以在MVC5属性路由中完成吗?因为我发现第三方库支持控制器之间的优先级
https://github.com/mccalltd/AttributeRouting/wiki/Controlling-Route-Precedence
routes.MapAttributeRoutes(config =>
{
config.AddRoutesFromController<ProfileController>();
config.AddRoutesFromController<HomeController>();
});
答案 0 :(得分:1)
不,在ASP.Net MVC 5.2.3中不可能优先考虑控制器路由。如果多次匹配,则忽略操作的顺序并抛出异常。
我已经通过从https://aspnetwebstack.codeplex.com/SourceControl/latest下载源并检查函数GetControllerTypeFromDirectRoute(下面)来验证这一点。用这个函数做出的调用都没有做任何事情来确定路由的优先顺序,它们只是被找到并报告回来。如您所见,GetControllerTypeFromDirectRoute只会引发多重匹配。
一点都不好,但希望这能节省一些时间。
我将手动映射的路由放入以避免此问题。
private static Type GetControllerTypeFromDirectRoute(RouteData routeData)
{
Contract.Assert(routeData != null);
var matchingRouteDatas = routeData.GetDirectRouteMatches();
List<Type> controllerTypes = new List<Type>();
foreach (var directRouteData in matchingRouteDatas)
{
if (directRouteData != null)
{
Type controllerType = directRouteData.GetTargetControllerType();
if (controllerType == null)
{
// We don't expect this to happen, but it could happen if some code messes with the
// route data tokens and removes the key we're looking for.
throw new InvalidOperationException(MvcResources.DirectRoute_MissingControllerType);
}
if (!controllerTypes.Contains(controllerType))
{
controllerTypes.Add(controllerType);
}
}
}
// We only want to handle the case where all matched direct routes refer to the same controller.
// Handling the multiple-controllers case would put attribute routing down a totally different
// path than traditional routing.
if (controllerTypes.Count == 0)
{
return null;
}
else if (controllerTypes.Count == 1)
{
return controllerTypes[0];
}
else
{
throw CreateDirectRouteAmbiguousControllerException(controllerTypes);
}
}