Dispose controllers after they have been utilized by the action invoker

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

@@ -30,7 +30,6 @@ namespace Microsoft.AspNet.Mvc
 
             var controller = _activator.CreateInstance(_serviceProvider, actionDescriptor.ControllerDescriptor.ControllerTypeInfo.AsType());
 
-            // TODO: How do we feed the controller with context (need DI improvements)
             InitializeController(controller, actionContext);
 
             return controller;
@@ -38,6 +37,12 @@ namespace Microsoft.AspNet.Mvc
 
         public void ReleaseController(object controller)
         {
+            var disposableController = controller as IDisposable;
+
+            if (disposableController != null)
+            {
+                disposableController.Dispose();
+            }
         }
 
         private void InitializeController(object controller, ActionContext actionContext)

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

@@ -1,11 +1,8 @@
-
-
-namespace Microsoft.AspNet.Mvc
+namespace Microsoft.AspNet.Mvc
 {
     public interface IControllerFactory
     {
         object CreateController(ActionContext actionContext);
-
         void ReleaseController(object controller);
     }
 }

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

@@ -48,8 +48,6 @@ namespace Microsoft.AspNet.Mvc
 
         public async Task InvokeActionAsync()
         {
-            IActionResult actionResult;
-
             var filterMetaItems = GetAndArrangeFilters();
 
             var controller = _controllerFactory.CreateController(_actionContext);
@@ -61,10 +59,17 @@ namespace Microsoft.AspNet.Mvc
                                                                  "controller"));
             }
 
-            actionResult = await RunAuthorizationFilters(filterMetaItems) ??
-                           await RunActionFiltersAndActions(filterMetaItems, controller);
+            try
+            {
+                var actionResult = await RunAuthorizationFilters(filterMetaItems) ??
+                               await RunActionFiltersAndActions(filterMetaItems, controller);
 
-            await RunActionResultFilters(actionResult, filterMetaItems);
+                await RunActionResultFilters(actionResult, filterMetaItems);
+            }
+            finally 
+            {
+                _controllerFactory.ReleaseController(controller);
+            }
         }
 
         private FilterItem[] GetAndArrangeFilters()

test/Microsoft.AspNet.Mvc.Core.Test/DefaultControllerFactoryTest.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNet.DependencyInjection;
+using Moq;
+using Xunit;
+
+namespace Microsoft.AspNet.Mvc.Core.Test
+{
+    public class DefaultControllerFactoryTest
+    {
+        [Fact]
+        public void DefaultControllerFactory_DisposesIDisposableController()
+        {
+            // Arrange
+            var factory = new DefaultControllerFactory(
+                new Mock<IServiceProvider>().Object,
+                new Mock<ITypeActivator>().Object);
+
+            var controller = new MyController();
+
+            // Act + Assert
+            Assert.False(controller.Disposed);
+
+            factory.ReleaseController(controller);
+
+            Assert.True(controller.Disposed);
+        }
+
+        [Fact]
+        public void DefaultControllerFactory_ReleasesNonIDisposableController()
+        {
+            // Arrange
+            var factory = new DefaultControllerFactory(
+                new Mock<IServiceProvider>().Object,
+                new Mock<ITypeActivator>().Object);
+
+            var controller = new Object();
+
+            // Act + Assert
+            Assert.DoesNotThrow(() => factory.ReleaseController(controller));
+        }
+
+        private class MyController : Controller, IDisposable
+        {
+            public bool Disposed { get; set; }
+            public void Dispose()
+            {
+                Disposed = true;
+            }
+        }
+    }
+}