Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

external/aspnetwebstack/src/System.Web.Mvc/AdditionalMetaDataAttribute.cs

@@ -0,0 +1,40 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
+
+namespace System.Web.Mvc
+{
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Interface | AttributeTargets.Property, AllowMultiple = true)]
+    public sealed class AdditionalMetadataAttribute : Attribute, IMetadataAware
+    {
+        private object _typeId = new object();
+
+        public AdditionalMetadataAttribute(string name, object value)
+        {
+            if (name == null)
+            {
+                throw new ArgumentNullException("name");
+            }
+
+            Name = name;
+            Value = value;
+        }
+
+        public override object TypeId
+        {
+            get { return _typeId; }
+        }
+
+        public string Name { get; private set; }
+
+        public object Value { get; private set; }
+
+        public void OnMetadataCreated(ModelMetadata metadata)
+        {
+            if (metadata == null)
+            {
+                throw new ArgumentNullException("metadata");
+            }
+
+            metadata.AdditionalValues[Name] = Value;
+        }
+    }
+}