1 files changed, 50 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/AppDomainAttributes.cs b/src/mscorlib/src/System/AppDomainAttributes.cs
new file mode 100644
index 0000000000..d8fc16a126
--- /dev/null
+++ b/src/mscorlib/src/System/AppDomainAttributes.cs
@@ -0,0 +1,50 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+/*=============================================================================
+**
+** 
+**
+** Purpose: For AppDomain-related custom attributes.
+**
+**
+=============================================================================*/
+
+namespace System {
+
+    [Serializable]
+    [System.Runtime.InteropServices.ComVisible(true)]
+    public enum LoaderOptimization 
+    {
+        NotSpecified            = 0,
+        SingleDomain            = 1,
+        MultiDomain             = 2,
+        MultiDomainHost         = 3,
+#if !FEATURE_CORECLR
+        [Obsolete("This method has been deprecated. Please use Assembly.Load() instead. http://go.microsoft.com/fwlink/?linkid=14202")]
+        DomainMask              = 3,
+
+        [Obsolete("This method has been deprecated. Please use Assembly.Load() instead. http://go.microsoft.com/fwlink/?linkid=14202")]
+        DisallowBindings        = 4           
+#endif        
+    }
+
+    [AttributeUsage (AttributeTargets.Method)]  
+    [System.Runtime.InteropServices.ComVisible(true)]
+    public sealed class LoaderOptimizationAttribute : Attribute
+    {
+        internal byte _val;
+
+        public LoaderOptimizationAttribute(byte value)
+        {
+            _val = value;
+        }
+        public LoaderOptimizationAttribute(LoaderOptimization value)
+        {
+            _val = (byte) value;
+        }
+        public LoaderOptimization Value 
+        {  get {return (LoaderOptimization) _val;} }
+    }
+}
+