List(Of T).Reverse Method (Int32, Int32)
Reverses the order of the elements in the specified range.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- index
-
Type:
System.Int32
The zero-based starting index of the range to reverse.
- count
-
Type:
System.Int32
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 List(Of T). |
This method uses Array.Reverse to reverse the order of the elements.
This method is an O(n) operation, where n is Count.
The following example demonstrates both overloads of the Reverse method. The example creates a List(Of T) 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 'Pachycephalosaurus
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1