Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Runtime.Caching/System/Caching/MemoryCacheKey.cs

@@ -0,0 +1,22 @@
+// <copyright file="MemoryCacheKey.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+using System;
+using System.Collections;
+using System.Diagnostics.CodeAnalysis;
+
+namespace System.Runtime.Caching {
+    internal class MemoryCacheKey {
+        private String _key;
+        private int _hash;
+        protected byte _bits;
+
+        internal int Hash { get { return _hash; } }
+        internal String Key { get { return _key; } }
+
+        internal MemoryCacheKey(String key) {       
+            _key = key;
+            _hash = key.GetHashCode();
+        }           
+    }
+}