Adding NonAction Attribute

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

@@ -86,7 +86,8 @@ namespace Microsoft.AspNet.Mvc
 
                 // The SpecialName bit is set to flag members that are treated in a special way by some compilers 
                 // (such as property accessors and operator overloading methods).
-                !method.IsSpecialName;
+                !method.IsSpecialName &&
+                !method.IsDefined(typeof(NonActionAttribute));
         }
 
         public virtual IEnumerable<string> GetSupportedHttpMethods(MethodInfo methodInfo)

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

@@ -0,0 +1,9 @@
+using System;
+
+namespace Microsoft.AspNet.Mvc
+{
+    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
+    public sealed class NonActionAttribute : Attribute
+    {
+    }
+}

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

@@ -5,6 +5,7 @@ using Microsoft.AspNet.DependencyInjection.NestedProviders;
 using Moq;
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Reflection;
 using System.Threading.Tasks;
 using Xunit;
@@ -108,6 +109,26 @@ namespace Microsoft.AspNet.Mvc.Core.Test
             Assert.Equal("Index", result.Name);
         }
 
+        [Theory]
+        [InlineData("Put")]
+        [InlineData("RPCMethod")]
+        [InlineData("RPCMethodWithHttpGet")]
+        public async Task NonActionAttribute_ActionNotReachable(string actionName)
+        {
+            // Arrange
+            var actionDescriptorProvider = GetActionDescriptorProvider(_actionDiscoveryConventions);
+
+            // Act
+            var result = actionDescriptorProvider.GetDescriptors()
+                                                 .Select(x => x as ReflectedActionDescriptor)
+                                                 .FirstOrDefault(
+                                                            x=> x.ControllerName == "NonAction" &&
+                                                                x.Name == actionName);
+
+            // Assert
+            Assert.Null(result);
+        }
+
         [Theory]
         [InlineData("GET")]
         [InlineData("PUT")]
@@ -220,6 +241,25 @@ namespace Microsoft.AspNet.Mvc.Core.Test
 
         #region Controller Classes
 
+        private class NonActionController
+        {
+            [NonAction]
+            public void Put()
+            {
+            }
+
+            [NonAction]
+            public void RPCMethod()
+            {
+            }
+
+            [NonAction]
+            [HttpGet]
+            public void RPCMethodWithHttpGet()
+            {
+            }
+        }
+
         private class HttpMethodAttributeTests_DefaultMethodValidationController
         {
             public void Index()