1 files changed, 19 insertions, 0 deletions
diff --git a/src/System.Web.Mvc/ChildActionOnlyAttribute.cs b/src/System.Web.Mvc/ChildActionOnlyAttribute.cs
new file mode 100644
index 00000000..16647f4a
--- /dev/null
+++ b/src/System.Web.Mvc/ChildActionOnlyAttribute.cs
@@ -0,0 +1,19 @@
+namespace System.Web.Mvc
+{
+    [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);
+            }
+        }
+    }
+}