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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.
+
+/*============================================================
+**
+** Interface: IDictionary
+**
+**
+**
+**
+** Purpose: Base interface for all dictionaries.
+**
+**
+===========================================================*/
+namespace System.Collections {
+ using System;
+ using System.Diagnostics.Contracts;
+
+ // An IDictionary is a possibly unordered set of key-value pairs.
+ // Keys can be any non-null object. Values can be any object.
+ // You can look up a value in an IDictionary via the default indexed
+ // property, Items.
+ [System.Runtime.InteropServices.ComVisible(true)]
+ public interface IDictionary : ICollection
+ {
+ // Interfaces are not serializable
+ // The Item property provides methods to read and edit entries
+ // in the Dictionary.
+ Object this[Object key] {
+ get;
+ set;
+ }
+
+ // Returns a collections of the keys in this dictionary.
+ ICollection Keys {
+ get;
+ }
+
+ // Returns a collections of the values in this dictionary.
+ ICollection Values {
+ get;
+ }
+
+ // Returns whether this dictionary contains a particular key.
+ //
+ bool Contains(Object key);
+
+ // Adds a key-value pair to the dictionary.
+ //
+ void Add(Object key, Object value);
+
+ // Removes all pairs from the dictionary.
+ void Clear();
+
+ bool IsReadOnly
+ { get; }
+
+ bool IsFixedSize
+ { get; }
+
+ // Returns an IDictionaryEnumerator for this dictionary.
+ new IDictionaryEnumerator GetEnumerator();
+
+ // Removes a particular key from the dictionary.
+ //
+ void Remove(Object key);
+ }
+}