Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/ModelBinding/ModelMetadataProviders.cs

@@ -0,0 +1,14 @@
+namespace System.Web.ModelBinding {
+    public static class ModelMetadataProviders {
+        private static ModelMetadataProvider _current = new DataAnnotationsModelMetadataProvider();
+
+        public static ModelMetadataProvider Current {
+            get {
+                return _current;
+            }
+            set {
+                _current = value ?? new EmptyModelMetadataProvider();
+            }
+        }
+    }
+}