This interface defines the basic characteristics of an indexable collection of objects. All array and collection classes implement this interface. IList defines methods by adding an element to the end of a list (Add( )), inserting or removing an element at a specific index (Insert( ) and RemoveAt( )), or removing all elements. Remove( ) removes the first occurrence of a specific object from a list. Changing the elements of a list requires that the class be resizable and modifiable (see the IsFixedSize property). The Contains( ) method checks to see if a given value is contained in the list, while IndexOf( ) returns the index of an existing list value.

public interface IList : ICollection, IEnumerable {
// Public Instance Properties
   public bool IsFixedSize{get; }
   public bool IsReadOnly{get; }
   public object this[int index]{set; get; }
// Public Instance Methods
   public int Add(object value);
   public void Clear( );
   public bool Contains(object value);
   public int IndexOf(object value);
   public void Insert(int index, object value);
   public void Remove(object value);
   public void RemoveAt(int index);
}

Implemented By

ArrayList, CollectionBase, System.Array, System.Collections.Specialized.StringCollection, System.Diagnostics.TraceListenerCollection

Returned By

ArrayList.{FixedSize( ), ReadOnly( ), Synchronized( )}, CollectionBase.List, SortedList.{GetKeyList( ), GetValueList( )}

Passed To

ArrayList.{Adapter( ), FixedSize( ), ReadOnly( ), Synchronized( )}, System.Net.Sockets.Socket.Select( )