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src/Yavsc/Helpers/ControllerHelpers.cs

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+using System.Collections.Generic;
+using Microsoft.AspNet.Mvc;
+using Yavsc.Models.Messaging;
+
+namespace Yavsc.Helpers
+{
+    public static class ControllerHelpers
+    {
+        public static void NotifyWarning(this Controller controller, string title, string body)
+        {
+            var notifs = SetupNotificationList(controller);
+            notifs.Add(new Notification { title = title, body = body });
+        }
+        public static void NotifyInfo(this Controller controller, string title, string body)
+        {
+            var notifs = SetupNotificationList(controller);
+            notifs.Add(new Notification { title = title, body = body });
+        }
+         public static void Notify(this Controller controller, IEnumerable<Notification> notes)
+        {
+            var notifs = SetupNotificationList(controller);
+            notifs.AddRange(notes);
+        }
+        private static List<Notification> SetupNotificationList(this Controller controller)
+        {
+            List<Notification> notifs = (List<Notification>)controller.ViewData["Notify"];
+            if (notifs == null)
+            {
+                controller.ViewData["Notify"] = notifs = new List<Notification>();
+            }
+            return notifs;
+        }
+
+        /// <summary>
+        /// If Json is accepted, serve json, 
+        /// if not, serve a web page.
+        /// </summary>
+        /// <param name="controller"></param>
+        /// <param name="model"></param>
+        /// <returns></returns>
+        public static IActionResult ViewOk(this Controller controller, object model)
+        {
+            IActionResult result;
+            if (JsonResponse(controller, model, out result)) return result;
+            else return controller.View(model);
+        }
+        
+        static bool JsonResponse(this Controller controller, object model, out IActionResult result){
+
+            if (controller.Request.Headers.Keys.Contains("Accept")) {
+                var accepted = controller.Request.Headers["Accept"];
+                if (accepted == "application/json")
+                {
+                    if (controller.ModelState.ErrorCount>0) 
+                       result = controller.HttpBadRequest(controller.ModelState);
+                    else 
+                       result = controller.Ok(model);
+                    return true;
+                }
+            }
+            result = null;
+            return false;
+        }
+
+        public static IActionResult ViewOk(this Controller controller, string viewname, object model = null)
+        {
+            IActionResult result;
+            if (JsonResponse(controller, model, out result)) return result;
+            else return controller.View(viewname, model);
+        }
+    }
+}