Reverses the order of the elements in the specified range.
Assembly: mscorlib (in mscorlib.dll)
Public Sub Reverse ( _
index As [%$TOPIC/hf2ay11y_en-us_VS_110_1_0_0_0_0%], _
count As [%$TOPIC/hf2ay11y_en-us_VS_110_1_0_0_0_1%] _
)public void Reverse(
[%$TOPIC/hf2ay11y_en-us_VS_110_1_0_1_0_0%] index,
[%$TOPIC/hf2ay11y_en-us_VS_110_1_0_1_0_1%] count
)public:
void Reverse(
[%$TOPIC/hf2ay11y_en-us_VS_110_1_0_2_0_0%] index,
[%$TOPIC/hf2ay11y_en-us_VS_110_1_0_2_0_1%] count
)member Reverse :
index:[%$TOPIC/hf2ay11y_en-us_VS_110_1_0_3_0_0%] *
count:[%$TOPIC/hf2ay11y_en-us_VS_110_1_0_3_0_1%] -> unitParameters
- index
- Type:
SystemInt32
The zero-based starting index of the range to reverse.
- count
- Type:
SystemInt32
The number of elements in the range to reverse.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | index is less than 0. -or- count is less than 0. |
| ArgumentException | index and count do not denote a valid range of elements in the ListT. |
This method uses ArrayReverse to reverse the order of the elements, such that the element at ListT[i], where i is any index within the range, moves to ListT[j], where j equals index plus index plus count minus i minus 1.
This method is an O(n) operation, where n is Count.
The following code example demonstrates both overloads of the Reverse method. The code example creates a ListT of strings and adds six strings. The Reverse method overload is used to reverse the list, and then the Reverse(Int32, Int32) method overload is used to reverse the middle of the list, beginning with element 1 and encompassing four elements.
Imports System
Imports System.Collections.Generic
Public Class Example
Public Shared Sub Main()
Dim dinosaurs As New List(Of String)
dinosaurs.Add("Pachycephalosaurus")
dinosaurs.Add("Parasauralophus")
dinosaurs.Add("Mamenchisaurus")
dinosaurs.Add("Amargasaurus")
dinosaurs.Add("Coelophysis")
dinosaurs.Add("Oviraptor")
Console.WriteLine()
For Each dinosaur As String In dinosaurs
Console.WriteLine(dinosaur)
Next
dinosaurs.Reverse()
Console.WriteLine()
For Each dinosaur As String In dinosaurs
Console.WriteLine(dinosaur)
Next
dinosaurs.Reverse(1, 4)
Console.WriteLine()
For Each dinosaur As String In dinosaurs
Console.WriteLine(dinosaur)
Next
End Sub
End Class
' This code example produces the following output:
'
'Pachycephalosaurus
'Parasauralophus
'Mamenchisaurus
'Amargasaurus
'Coelophysis
'Oviraptor
'
'Oviraptor
'Coelophysis
'Amargasaurus
'Mamenchisaurus
'Parasauralophus
'Pachycephalosaurus
'
'Oviraptor
'Parasauralophus
'Mamenchisaurus
'Amargasaurus
'Coelophysis
'Pachycephalosaurususing System;
using System.Collections.Generic;
public class Example
{
public static void Main()
{
List<string> dinosaurs = new List<string>();
dinosaurs.Add("Pachycephalosaurus");
dinosaurs.Add("Parasauralophus");
dinosaurs.Add("Mamenchisaurus");
dinosaurs.Add("Amargasaurus");
dinosaurs.Add("Coelophysis");
dinosaurs.Add("Oviraptor");
Console.WriteLine();
foreach(string dinosaur in dinosaurs)
{
Console.WriteLine(dinosaur);
}
dinosaurs.Reverse();
Console.WriteLine();
foreach(string dinosaur in dinosaurs)
{
Console.WriteLine(dinosaur);
}
dinosaurs.Reverse(1, 4);
Console.WriteLine();
foreach(string dinosaur in dinosaurs)
{
Console.WriteLine(dinosaur);
}
}
}
/* This code example produces the following output:
Pachycephalosaurus
Parasauralophus
Mamenchisaurus
Amargasaurus
Coelophysis
Oviraptor
Oviraptor
Coelophysis
Amargasaurus
Mamenchisaurus
Parasauralophus
Pachycephalosaurus
Oviraptor
Parasauralophus
Mamenchisaurus
Amargasaurus
Coelophysis
Pachycephalosaurus
*/using namespace System;
using namespace System::Collections::Generic;
void main()
{
List<String^>^ dinosaurs = gcnew List<String^>();
dinosaurs->Add("Pachycephalosaurus");
dinosaurs->Add("Parasauralophus");
dinosaurs->Add("Mamenchisaurus");
dinosaurs->Add("Amargasaurus");
dinosaurs->Add("Coelophysis");
dinosaurs->Add("Oviraptor");
Console::WriteLine();
for each(String^ dinosaur in dinosaurs)
{
Console::WriteLine(dinosaur);
}
dinosaurs->Reverse();
Console::WriteLine();
for each(String^ dinosaur in dinosaurs)
{
Console::WriteLine(dinosaur);
}
dinosaurs->Reverse(1, 4);
Console::WriteLine();
for each(String^ dinosaur in dinosaurs)
{
Console::WriteLine(dinosaur);
}
}
/* This code example produces the following output:
Pachycephalosaurus
Parasauralophus
Mamenchisaurus
Amargasaurus
Coelophysis
Oviraptor
Oviraptor
Coelophysis
Amargasaurus
Mamenchisaurus
Parasauralophus
Pachycephalosaurus
Oviraptor
Parasauralophus
Mamenchisaurus
Amargasaurus
Coelophysis
Pachycephalosaurus
*/Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
