Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/class/System.Web.Mvc3/Mvc/ChildActionOnlyAttribute.cs

@@ -0,0 +1,18 @@
+namespace System.Web.Mvc {
+    using System;
+
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
+    public sealed class ChildActionOnlyAttribute : FilterAttribute, IAuthorizationFilter {
+
+        public void OnAuthorization(AuthorizationContext filterContext) {
+            if (filterContext == null) {
+                throw new ArgumentNullException("filterContext");
+            }
+
+            if (!filterContext.IsChildAction) {
+                throw Error.ChildActionOnlyAttribute_MustBeInChildRequest(filterContext.ActionDescriptor);
+            }
+        }
+
+    }
+}