1 files changed, 64 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Resources/NeutralResourcesLanguageAttribute.cs b/src/mscorlib/src/System/Resources/NeutralResourcesLanguageAttribute.cs
new file mode 100644
index 0000000000..e8972c739d
--- /dev/null
+++ b/src/mscorlib/src/System/Resources/NeutralResourcesLanguageAttribute.cs
@@ -0,0 +1,64 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+/*============================================================
+**
+** 
+** 
+**
+**
+** Purpose: Tells the ResourceManager what language your main
+**          assembly's resources are written in.  The 
+**          ResourceManager won't try loading a satellite
+**          assembly for that culture, which helps perf.
+**
+**
+** NOTE:
+**
+** This custom attribute is no longer implemented in managed code.  As part of a perf optimization,
+** it is now read in Module::GetNeutralResourcesLanguage, accessed from ManifestBasedResourceGroveler 
+** through an internal runtime call.
+===========================================================*/
+
+namespace System.Resources {
+    using System;
+    using System.Diagnostics.Contracts;
+    
+    [AttributeUsage(AttributeTargets.Assembly, AllowMultiple=false)]  
+    [System.Runtime.InteropServices.ComVisible(true)]
+    public sealed class NeutralResourcesLanguageAttribute : Attribute 
+    {
+        private String _culture;
+        private UltimateResourceFallbackLocation _fallbackLoc;
+
+        public NeutralResourcesLanguageAttribute(String cultureName)
+        {
+            if (cultureName == null)
+                throw new ArgumentNullException("cultureName");
+            Contract.EndContractBlock();
+
+            _culture = cultureName;
+            _fallbackLoc = UltimateResourceFallbackLocation.MainAssembly;
+        }
+
+        public NeutralResourcesLanguageAttribute(String cultureName, UltimateResourceFallbackLocation location)
+        {
+            if (cultureName == null)
+                throw new ArgumentNullException("cultureName");
+            if (!Enum.IsDefined(typeof(UltimateResourceFallbackLocation), location))
+                throw new ArgumentException(Environment.GetResourceString("Arg_InvalidNeutralResourcesLanguage_FallbackLoc", location));
+            Contract.EndContractBlock();
+
+            _culture = cultureName;
+            _fallbackLoc = location;
+        }
+
+        public String CultureName {
+            get { return _culture; }
+        }
+
+        public UltimateResourceFallbackLocation Location {
+            get { return _fallbackLoc; }
+        }
+    }
+}