Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

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

@@ -0,0 +1,26 @@
+// <copyright file="MemoryCacheEqualityComparer.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+using System;
+using System.Collections;
+
+namespace System.Runtime.Caching {
+    internal class MemoryCacheEqualityComparer: IEqualityComparer {
+
+        bool IEqualityComparer.Equals(Object x, Object y) {
+            Dbg.Assert(x != null && x is MemoryCacheKey);
+            Dbg.Assert(y != null && y is MemoryCacheKey);
+
+            MemoryCacheKey a, b;
+            a = (MemoryCacheKey)x;
+            b = (MemoryCacheKey)y;
+
+            return (String.Compare(a.Key, b.Key, StringComparison.Ordinal) == 0);
+        }
+
+        int IEqualityComparer.GetHashCode(Object obj) {
+            MemoryCacheKey cacheKey = (MemoryCacheKey) obj;
+            return cacheKey.Hash;
+        }
+    }
+}