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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
+{
+ // An IList is an ordered collection of objects. The exact ordering
+ // is up to the implementation of the list, ranging from a sorted
+ // order to insertion order.
+ public interface IList : ICollection
+ {
+ // The Item property provides methods to read and edit entries in the List.
+ Object this[int index]
+ {
+ get;
+ set;
+ }
+
+ // Adds an item to the list. The exact position in the list is
+ // implementation-dependent, so while ArrayList may always insert
+ // in the last available location, a SortedList most likely would not.
+ // The return value is the position the new element was inserted in.
+ int Add(Object value);
+
+ // Returns whether the list contains a particular item.
+ bool Contains(Object value);
+
+ // Removes all items from the list.
+ void Clear();
+
+ bool IsReadOnly
+ { get; }
+
+
+ bool IsFixedSize
+ {
+ get;
+ }
+
+
+ // Returns the index of a particular item, if it is in the list.
+ // Returns -1 if the item isn't in the list.
+ int IndexOf(Object value);
+
+ // Inserts value into the list at position index.
+ // index must be non-negative and less than or equal to the
+ // number of elements in the list. If index equals the number
+ // of items in the list, then value is appended to the end.
+ void Insert(int index, Object value);
+
+ // Removes an item from the list.
+ void Remove(Object value);
+
+ // Removes the item at position index.
+ void RemoveAt(int index);
+ }
+}