ArrayList.RemoveRange(Int32, Int32) Method

public:
 virtual void RemoveRange(int index, int count);

public virtual void RemoveRange(int index, int count);

abstract member RemoveRange : int * int -> unit
override this.RemoveRange : int * int -> unit

Public Overridable Sub RemoveRange (index As Integer, count As Integer)

Parameters

Exceptions

Examples

The following code example shows how to remove elements from the ArrayList.

using System;
using System.Collections;
public class SamplesArrayList {

 public static void Main() {

 // Creates and initializes a new ArrayList.
 ArrayList myAL = new ArrayList();
 myAL.Add( "The" );
 myAL.Add( "quick" );
 myAL.Add( "brown" );
 myAL.Add( "fox" );
 myAL.Add( "jumps" );
 myAL.Add( "over" );
 myAL.Add( "the" );
 myAL.Add( "lazy" );
 myAL.Add( "dog" );

 // Displays the ArrayList.
 Console.WriteLine( "The ArrayList initially contains the following:" );
 PrintValues( myAL );

 // Removes the element containing "lazy".
 myAL.Remove( "lazy" );

 // Displays the current state of the ArrayList.
 Console.WriteLine( "After removing \"lazy\":" );
 PrintValues( myAL );

 // Removes the element at index 5.
 myAL.RemoveAt( 5 );

 // Displays the current state of the ArrayList.
 Console.WriteLine( "After removing the element at index 5:" );
 PrintValues( myAL );

 // Removes three elements starting at index 4.
 myAL.RemoveRange( 4, 3 );

 // Displays the current state of the ArrayList.
 Console.WriteLine( "After removing three elements starting at index 4:" );
 PrintValues( myAL );
 }

 public static void PrintValues( IEnumerable myList ) {
 foreach ( Object obj in myList )
 Console.Write( " {0}", obj );
 Console.WriteLine();
 }
}
/*
This code produces the following output.

The ArrayList initially contains the following:
 The quick brown fox jumps over the lazy dog
After removing "lazy":
 The quick brown fox jumps over the dog
After removing the element at index 5:
 The quick brown fox jumps the dog
After removing three elements starting at index 4:
 The quick brown fox
*/

Imports System.Collections

Public Class SamplesArrayList 
 
 Public Shared Sub Main()
 
 ' Creates and initializes a new ArrayList.
 Dim myAL As New ArrayList()
 myAL.Add("The")
 myAL.Add("quick")
 myAL.Add("brown")
 myAL.Add("fox")
 myAL.Add("jumps")
 myAL.Add("over")
 myAL.Add("the")
 myAL.Add("lazy")
 myAL.Add("dog")
 
 ' Displays the ArrayList.
 Console.WriteLine("The ArrayList initially contains the following:")
 PrintValues(myAL)
 
 ' Removes the element containing "lazy".
 myAL.Remove("lazy")
 
 ' Displays the current state of the ArrayList.
 Console.WriteLine("After removing ""lazy"":")
 PrintValues(myAL)
 
 ' Removes the element at index 5.
 myAL.RemoveAt(5)
 
 ' Displays the current state of the ArrayList.
 Console.WriteLine("After removing the element at index 5:")
 PrintValues(myAL)
 
 ' Removes three elements starting at index 4.
 myAL.RemoveRange(4, 3)
 
 ' Displays the current state of the ArrayList.
 Console.WriteLine("After removing three elements starting at index 4:")
 PrintValues(myAL)
 End Sub
 
 Public Shared Sub PrintValues(myList As IEnumerable)
 Dim obj As [Object]
 For Each obj In myList
 Console.Write(" {0}", obj)
 Next obj
 Console.WriteLine()
 End Sub

End Class


' This code produces the following output.
' 
' The ArrayList initially contains the following:
' The quick brown fox jumps over the lazy dog
' After removing "lazy":
' The quick brown fox jumps over the dog
' After removing the element at index 5:
' The quick brown fox jumps the dog
' After removing three elements starting at index 4:
' The quick brown fox

Remarks

In collections of contiguous elements, such as lists, the elements that follow the removed element move up to occupy the vacated spot. If the collection is indexed, the indexes of the elements that are moved are also updated. This behavior does not apply to collections where elements are conceptually grouped into buckets, such as a hash table.

This method is an O(n) operation, where n is Count.

See also

• Remove(Object)
• RemoveAt(Int32)
• GetRange(Int32, Int32)
• AddRange(ICollection)
• InsertRange(Int32, ICollection)
• SetRange(Int32, ICollection)