1 files changed, 58 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/CLRIKeyValuePairImpl.cs b/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/CLRIKeyValuePairImpl.cs
new file mode 100644
index 0000000000..683a7f3327
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/CLRIKeyValuePairImpl.cs
@@ -0,0 +1,58 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+//
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.Contracts;
+
+namespace System.Runtime.InteropServices.WindowsRuntime
+{
+    // Provides access to a System.Collections.Generic.KeyValuePair<K, V> via the IKeyValuePair<K, V> WinRT interface.
+    internal sealed class CLRIKeyValuePairImpl<K, V> : IKeyValuePair<K, V>
+    {
+        private readonly KeyValuePair<K, V> _pair;
+
+        public CLRIKeyValuePairImpl([In] ref KeyValuePair<K, V> pair)
+        {
+            _pair = pair;
+        }
+
+        // IKeyValuePair<K, V> implementation
+        [Pure]
+        public K Key
+        {
+            get { return _pair.Key; }
+        }
+
+        [Pure]
+        public V Value
+        {
+            get { return _pair.Value; }
+        }
+
+        // Called from the VM to wrap a boxed KeyValuePair with a CLRIKeyValuePairImpl.
+        internal static object BoxHelper(object pair)
+        {
+            Contract.Requires(pair != null);
+
+            KeyValuePair<K, V> unboxedPair = (KeyValuePair<K, V>)pair;
+            return new CLRIKeyValuePairImpl<K, V>(ref unboxedPair);
+        }
+
+        // Called from the VM to get a boxed KeyValuePair out of a CLRIKeyValuePairImpl.
+        internal static object UnboxHelper(object wrapper)
+        {
+            Contract.Requires(wrapper != null);
+            
+            CLRIKeyValuePairImpl<K, V> reference = (CLRIKeyValuePairImpl<K, V>)wrapper;
+            return reference._pair;
+        }
+
+        public override string ToString()
+        {
+            return _pair.ToString();
+        }
+    }
+}