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diff --git a/src/mscorlib/shared/System/Collections/Generic/IReadOnlyDictionary.cs b/src/mscorlib/shared/System/Collections/Generic/IReadOnlyDictionary.cs
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Diagnostics.Contracts;
+
+namespace System.Collections.Generic
+{
+ // Provides a read-only view of a generic dictionary.
+ public interface IReadOnlyDictionary<TKey, TValue> : IReadOnlyCollection<KeyValuePair<TKey, TValue>>
+ {
+ bool ContainsKey(TKey key);
+ bool TryGetValue(TKey key, out TValue value);
+
+ TValue this[TKey key] { get; }
+ IEnumerable<TKey> Keys { get; }
+ IEnumerable<TValue> Values { get; }
+ }
+}