ArrayList.GetRange Method
Returns an ArrayList which represents a subset of the elements in the source ArrayList.
[Visual Basic] Public Overridable Function GetRange( _ ByVal index As Integer, _ ByVal count As Integer _ ) As ArrayList [C#] public virtual ArrayList GetRange( int index, int count ); [C++] public: virtual ArrayList* GetRange( int index, int count ); [JScript] public function GetRange( index : int, count : int ) : ArrayList;
Parameters
- index
- The zero-based ArrayList index at which the range starts.
- count
- The number of elements in the range.
Return Value
An ArrayList which represents a subset of the elements in the source ArrayList.
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. |
Remarks
This method does not create copies of the elements. The new ArrayList is only a view window into the source ArrayList. However, all subsequent changes to the source ArrayList must be done through this view window ArrayList. If changes are made directly to the source ArrayList, the view window ArrayList is invalidated and any operations on it will return an InvalidOperationException.
Example
The following example shows how to set and get a range of elements in 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") ' Creates and initializes the source ICollection. Dim mySourceList As New Queue() mySourceList.Enqueue("big") mySourceList.Enqueue("gray") mySourceList.Enqueue("wolf") ' Displays the values of five elements starting at index 0. Dim mySubAL As ArrayList = myAL.GetRange(0, 5) Console.WriteLine("Index 0 through 4 contains:") PrintValues(mySubAL, ControlChars.Tab) ' Replaces the values of five elements starting at index 1 with the ' values in the ICollection. myAL.SetRange(1, mySourceList) ' Displays the values of five elements starting at index 0. mySubAL = myAL.GetRange(0, 5) Console.WriteLine("Index 0 through 4 now contains:") PrintValues(mySubAL, ControlChars.Tab) End Sub Public Shared Sub PrintValues(myList As IEnumerable, mySeparator As Char) Dim myEnumerator As System.Collections.IEnumerator = _ myList.GetEnumerator() While myEnumerator.MoveNext() Console.Write("{0}{1}", mySeparator, myEnumerator.Current) End While Console.WriteLine() End Sub End Class ' This code produces the following output. ' ' Index 0 through 4 contains: ' The quick brown fox jumped ' Index 0 through 4 now contains: ' The big gray wolf jumped [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" ); // Creates and initializes the source ICollection. Queue mySourceList = new Queue(); mySourceList.Enqueue( "big" ); mySourceList.Enqueue( "gray" ); mySourceList.Enqueue( "wolf" ); // Displays the values of five elements starting at index 0. ArrayList mySubAL = myAL.GetRange( 0, 5 ); Console.WriteLine( "Index 0 through 4 contains:" ); PrintValues( mySubAL, '\t' ); // Replaces the values of five elements starting at index 1 with the values in the ICollection. myAL.SetRange( 1, mySourceList ); // Displays the values of five elements starting at index 0. mySubAL = myAL.GetRange( 0, 5 ); Console.WriteLine( "Index 0 through 4 now contains:" ); PrintValues( mySubAL, '\t' ); } public static void PrintValues( IEnumerable myList, char mySeparator ) { System.Collections.IEnumerator myEnumerator = myList.GetEnumerator(); while ( myEnumerator.MoveNext() ) Console.Write( "{0}{1}", mySeparator, myEnumerator.Current ); Console.WriteLine(); } } /* This code produces the following output. Index 0 through 4 contains: The quick brown fox jumped Index 0 through 4 now contains: The big gray wolf jumped */ [C++] #using <mscorlib.dll> using namespace System; using namespace System::Collections; void PrintValues( IEnumerable* myList, String* mySeparator ); 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" ); // Creates and initializes the source ICollection. Queue* mySourceList = new Queue(); mySourceList->Enqueue( S"big" ); mySourceList->Enqueue( S"gray" ); mySourceList->Enqueue( S"wolf" ); String* szSeparator = "\t"; // Displays the values of five elements starting at index 0. ArrayList* mySubAL = myAL->GetRange( 0, 5 ); Console::WriteLine( "Index 0 through 4 contains:" ); PrintValues( mySubAL, szSeparator ); // Replaces the values of five elements starting at index 1 with the values in the ICollection. myAL->SetRange( 1, mySourceList ); // Displays the values of five elements starting at index 0. mySubAL = myAL->GetRange( 0, 5 ); Console::WriteLine( "Index 0 through 4 now contains:" ); PrintValues( mySubAL, szSeparator ); } void PrintValues( IEnumerable* myList, String* mySeparator ) { System::Collections::IEnumerator* myEnumerator = myList->GetEnumerator(); while ( myEnumerator->MoveNext() ) Console::Write( "{0}{1}", mySeparator, myEnumerator->Current ); Console::WriteLine(); } /* This code produces the following output. Index 0 through 4 contains: The quick brown fox jumped Index 0 through 4 now contains: The big gray wolf jumped */ [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" ); // Creates and initializes the source ICollection. var mySourceList : Queue = new Queue(); mySourceList.Enqueue( "big" ); mySourceList.Enqueue( "gray" ); mySourceList.Enqueue( "wolf" ); // Displays the values of five elements starting at index 0. var mySubAL : ArrayList = myAL.GetRange( 0, 5 ); Console.WriteLine( "Index 0 through 4 contains:" ); PrintValues( mySubAL, '\t' ); // Replaces the values of five elements starting at index 1 with the values in the ICollection. myAL.SetRange( 1, mySourceList ); // Displays the values of five elements starting at index 0. mySubAL = myAL.GetRange( 0, 5 ); Console.WriteLine( "Index 0 through 4 now contains:" ); PrintValues( mySubAL, '\t' ); function PrintValues( myList : IEnumerable, mySeparator : char ) { var myEnumerator : System.Collections.IEnumerator = myList.GetEnumerator(); while ( myEnumerator.MoveNext() ) Console.Write( "{0}{1}", mySeparator, myEnumerator.Current ); Console.WriteLine(); } /* This code produces the following output. Index 0 through 4 contains: The quick brown fox jumped Index 0 through 4 now contains: The big gray wolf jumped */
Requirements
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Common Language Infrastructure (CLI) Standard
See Also
ArrayList Class | ArrayList Members | System.Collections Namespace | RemoveRange | AddRange | InsertRange | SetRange