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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: IList
**
**
**
**
** Purpose: Base interface for all Lists.
**
**
===========================================================*/
namespace System.Collections {
using System;
using System.Diagnostics.Contracts;
// 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.
[System.Runtime.InteropServices.ComVisible(true)]
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);
}
}
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