在过滤器属性中获取区域，控制器和动作名称 [英] Getting area, controller and action names inside filter attributes

问题描述

我具有全局属性，需要在其中知道区域，控制器和动作.由于路由(内部区域注册和属性路由)，我无法使用RawUrl.我遵循以下两种方法，但是在两种情况下，我的区域都返回为空.当我使用路线时，我会得到区域名称.当我执行redirecttoaction或url.action或手动键入url等时，为什么我的区域为null?我们正在使用MVC 5.0.

I have global attribute in which i need to know the area, controller and action. I can't use RawUrl due to routes (inside area registration and attribute routing). I have followed the following two approaches but in both cases, my area is coming back as null. When i use a route then i get the area name just fine. Why is my area null when i do redirecttoaction or url.action or type the url manually etc? We are using MVC 5.0.

var routingValues = RouteTable.Routes.GetRouteData(new HttpContextWrapper(HttpContext.Current)).Values;

                        var currentArea = (string) routingValues["area"] ?? string.Empty;
                        var currentController = (string) routingValues["controller"] ?? string.Empty;
                        var currentAction = (string) routingValues["action"] ?? string.Empty;

2:

var handler = HttpContext.Current.Handler as System.Web.Mvc.MvcHandler;
                            var area = handler.RequestContext.RouteData.Values["area"];
                            var controller = handler.RequestContext.RouteData.Values["controller"];
                            var action = handler.RequestContext.RouteData.Values["action"];

就像我上面说的那样，如果我使用路线(/TipHotLine)，那么我得到的区域名称就很好了.

Like i said above, if i use a route (/TipHotLine) then i get the area name just fine.

public class AgencyAreaRegistration : AreaRegistration 
    {
        public override string AreaName 
        {
            get 
            {
                return "Agency";
            }
        }

        public override void RegisterArea(AreaRegistrationContext context) 
        {
            context.MapRoute(
                "Agency_default",
                "Agency/{controller}/{action}/{id}",
                new { action = "Index", id = UrlParameter.Optional }
            );

            context.MapRoute(
                "tiphotline",
                "tiphotline",
                new
                {
                    controller = "tiphotline",
                    action = "Index",
                    Area = "Agency"
                }
            );


        }
    }

推荐答案

注册区域后，使用的MapRoute方法将dataContextToken添加到每个路由.您可以在此处检查源代码，将会看到如下所示的方法，并且您会注意到一行添加了数据令牌:

When an area is registered the MapRoute method used is adding a dataContextToken to each route. You can check the source code here, you will see a method like the following and you will notice a line adding the data token:

public Route MapRoute(string name, string url, object defaults, object constraints, string[] namespaces)
{
    ...   
    route.DataTokens[RouteDataTokenKeys.Area] = AreaName;
    ...
    return route;
}

因此，在过滤器中，您只需要使用键"area"而不是路由值来获取数据令牌.例如，以下过滤器将在路由中找到的区域，控制器和动作中添加标题

So in your filter you just need to get the data token with key "area" instead of a route value. For example the following filter will add a header the area, controller, and action found in the route

public override void OnActionExecuting(ActionExecutingContext filterContext)
{
    var routingValues = filterContext.RouteData.Values;
    var currentArea = filterContext.RouteData.DataTokens["area"] ?? string.Empty;
    var currentController = (string)routingValues["controller"] ?? string.Empty;
    var currentAction = (string)routingValues["action"] ?? string.Empty;

    filterContext.HttpContext.Response.AddHeader("Routing info", string.Format("controller={0},action={1},area={2}", currentController, currentAction, currentArea));
}

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