ArrayList.RemoveRange Method
Removes a range of elements from the ArrayList.
[Visual Basic] Public Overridable Sub RemoveRange( _ ByVal index As Integer, _ ByVal count As Integer _ ) [C#] public virtual void RemoveRange( int index, int count ); [C++] public: virtual void RemoveRange( int index, int count ); [JScript] public function RemoveRange( index : int, count : int );
Parameters
- index
- The zero-based starting index of the range of elements to remove.
- count
- The number of elements to remove.
Exceptions
| Exception Type | Condition |
|---|---|
| ArgumentOutOfRangeException | index is less than zero.
-or- count is less than zero. |
| ArgumentException | index and count do not denote a valid range of elements in the ArrayList. |
| NotSupportedException | The ArrayList is read-only.
-or- The ArrayList has a fixed size. |
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 hashtable.
Example
The following example shows how to remove elements from the ArrayList.
[Visual Basic] Imports System Imports System.Collections Imports Microsoft.VisualBasic 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("jumped") 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 myEnumerator As System.Collections.IEnumerator = _ myList.GetEnumerator() While myEnumerator.MoveNext() Console.Write(ControlChars.Tab + "{0}", myEnumerator.Current) End While Console.WriteLine() End Sub End Class ' This code produces the following output. ' ' The ArrayList initially contains the following: ' The quick brown fox jumped over the lazy dog ' After removing "lazy": ' The quick brown fox jumped over the dog ' After removing the element at index 5: ' The quick brown fox jumped the dog ' After removing three elements starting at index 4: ' The quick brown fox [C#] 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( "jumped" ); 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 ) { System.Collections.IEnumerator myEnumerator = myList.GetEnumerator(); while ( myEnumerator.MoveNext() ) Console.Write( "\t{0}", myEnumerator.Current ); Console.WriteLine(); } } /* This code produces the following output. The ArrayList initially contains the following: The quick brown fox jumped over the lazy dog After removing "lazy": The quick brown fox jumped over the dog After removing the element at index 5: The quick brown fox jumped the dog After removing three elements starting at index 4: The quick brown fox */ [C++] #using <mscorlib.dll> using namespace System; using namespace System::Collections; void PrintValues( IEnumerable* myList ); int main() { // Creates and initializes a new ArrayList. ArrayList* myAL = new ArrayList(); myAL->Add( S"The" ); myAL->Add( S"quick" ); myAL->Add( S"brown" ); myAL->Add( S"fox" ); myAL->Add( S"jumped" ); myAL->Add( S"over" ); myAL->Add( S"the" ); myAL->Add( S"lazy" ); myAL->Add( S"dog" ); // Displays the ArrayList. Console::WriteLine( "The ArrayList initially contains the following:" ); PrintValues( myAL ); // Removes the element containing "lazy". myAL->Remove( S"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 ); } void PrintValues( IEnumerable* myList ) { System::Collections::IEnumerator* myEnumerator = myList->GetEnumerator(); while ( myEnumerator->MoveNext() ) Console::Write( "\t{0}", myEnumerator->Current ); Console::WriteLine(); } /* This code produces the following output. The ArrayList initially contains the following: The quick brown fox jumped over the lazy dog After removing "lazy": The quick brown fox jumped over the dog After removing the element at index 5: The quick brown fox jumped the dog After removing three elements starting at index 4: The quick brown fox */ [JScript] import System; import System.Collections; // Creates and initializes a new ArrayList. var myAL : ArrayList = new ArrayList(); myAL.Add( "The" ); myAL.Add( "quick" ); myAL.Add( "brown" ); myAL.Add( "fox" ); myAL.Add( "jumped" ); 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 ); function PrintValues( myList : IEnumerable ) { var myEnumerator : System.Collections.IEnumerator = myList.GetEnumerator(); while ( myEnumerator.MoveNext() ) Console.Write( "\t{0}", myEnumerator.Current ); Console.WriteLine(); } /* This code produces the following output. The ArrayList initially contains the following: The quick brown fox jumped over the lazy dog After removing "lazy": The quick brown fox jumped over the dog After removing the element at index 5: The quick brown fox jumped the dog After removing three elements starting at index 4: The quick brown fox */
Requirements
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework, Common Language Infrastructure (CLI) Standard
See Also
ArrayList Class | ArrayList Members | System.Collections Namespace | Remove | RemoveAt | GetRange | AddRange | InsertRange | SetRange