[Fixes #3749] Expose ActionContext on IUrlHelper

src/Microsoft.AspNet.Mvc.Core/IUrlHelper.cs

@@ -10,6 +10,11 @@ namespace Microsoft.AspNet.Mvc
     /// </summary>
     public interface IUrlHelper
     {
+        /// <summary>
+        /// Gets the <see cref="ActionContext"/> for the current request.
+        /// </summary>
+        ActionContext ActionContext { get; }
+
         /// <summary>
         /// Generates a fully qualified or absolute URL specified by <see cref="UrlActionContext"/> for an action
         /// method, which contains action name, controller name, route values, protocol to use, host name, and fragment.

src/Microsoft.AspNet.Mvc.Core/Routing/UrlHelper.cs

@@ -32,9 +32,10 @@ namespace Microsoft.AspNet.Mvc.Routing
             ActionContext = actionContext;
         }
 
-        protected RouteValueDictionary AmbientValues => ActionContext.RouteData.Values;
+        /// <inheritdoc />
+        public ActionContext ActionContext { get; }
 
-        protected ActionContext ActionContext { get; }
+        protected RouteValueDictionary AmbientValues => ActionContext.RouteData.Values;
 
         protected HttpContext HttpContext => ActionContext.HttpContext;
 

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/RemoteAttributeTest.cs

@@ -595,6 +595,8 @@ namespace Microsoft.AspNet.Mvc
                 _url = url;
             }
 
+            public ActionContext ActionContext { get; }
+
             public object RouteValues { get; private set; }
 
             public string Action(UrlActionContext actionContext)