Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Entity/System/Data/Common/QueryCache/CompiledQueryCacheKey.cs

@@ -0,0 +1,61 @@
+//------------------------------------------------------------------------------
+// <copyright file="CompiledQueryCacheKey.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner  [....]
+// @backupOwner [....]
+//------------------------------------------------------------------------------
+
+namespace System.Data.Common.QueryCache
+{
+    using System;
+    using System.Diagnostics;
+    
+    internal sealed class CompiledQueryCacheKey : QueryCacheKey
+    {
+        private readonly Guid _cacheIdentity;
+
+        internal CompiledQueryCacheKey(Guid cacheIdentity)
+        {
+            _cacheIdentity = cacheIdentity;
+        }
+
+        /// <summary>
+        /// Determines equality of this key with respect to <paramref name="compareTo"/>
+        /// </summary>
+        /// <param name="otherObject"></param>
+        /// <returns></returns>
+        public override bool Equals(object compareTo)
+        {
+            Debug.Assert(compareTo != null, "Comparison key should not be null");
+            if (typeof(CompiledQueryCacheKey) != compareTo.GetType())
+            {
+                return false;
+            }
+
+            return ((CompiledQueryCacheKey)compareTo)._cacheIdentity.Equals(this._cacheIdentity);
+        }
+
+        /// <summary>
+        /// Returns the hashcode for this cache key
+        /// </summary>
+        /// <returns></returns>
+        public override int GetHashCode()
+        {
+            return _cacheIdentity.GetHashCode();
+        }
+
+        /// <summary>
+        /// Returns a string representation of the state of this cache key
+        /// </summary>
+        /// <returns>
+        /// A string representation that includes query text, parameter information, include path information
+        /// and merge option information about this cache key.
+        /// </returns>
+        public override string ToString()
+        {
+            return _cacheIdentity.ToString();
+        }
+    }
+}