Enumerable.Reverse(IEnumerable<TSource>) Enumerable.Reverse(IEnumerable<TSource>) Enumerable.Reverse(IEnumerable<TSource>) Enumerable.Reverse(IEnumerable<TSource>) Method

Definizione

Inverte l'ordine degli elementi in una sequenza.Inverts the order of the elements in a sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::IEnumerable<TSource> ^ Reverse(System::Collections::Generic::IEnumerable<TSource> ^ source);
public static System.Collections.Generic.IEnumerable<TSource> Reverse<TSource> (this System.Collections.Generic.IEnumerable<TSource> source);
static member Reverse : seq<'Source> -> seq<'Source>
<Extension()>
Public Function Reverse(Of TSource) (source As IEnumerable(Of TSource)) As IEnumerable(Of TSource)

Parametri di tipo

TSource

Tipo degli elementi di source.The type of the elements of source.

Parametri

source
IEnumerable<TSource>

Sequenza di valori da invertire.A sequence of values to reverse.

Restituisce

IEnumerable<TSource>

Sequenza i cui elementi corrispondono a quelli della sequenza di input, in ordine inverso.A sequence whose elements correspond to those of the input sequence in reverse order.

Eccezioni

Esempi

Esempio di codice seguente viene illustrato come utilizzare Reverse per invertire l'ordine degli elementi in una matrice.The following code example demonstrates how to use Reverse to reverse the order of elements in an array.

char[] apple = { 'a', 'p', 'p', 'l', 'e' };

char[] reversed = apple.Reverse().ToArray();

foreach (char chr in reversed)
{
    Console.Write(chr + " ");
}
Console.WriteLine();

/*
 This code produces the following output:

 e l p p a
*/
' Create a List of Char values.
Dim appleLetters As New List(Of Char)(New Char() _
                                  {"a"c, "P"c, "P"c, "L"c, "E"c})

' Reverse the order of the elements in the list.
' (We have to call AsEnumerable() in order to
' use System.Linq.Enumerable's Reverse() method.
Dim reversed() As Char =
appleLetters.AsEnumerable().Reverse().ToArray()

Dim output As New System.Text.StringBuilder
For Each chr As Char In reversed
    output.Append(chr & " ")
Next

' Display the output.
MsgBox(output.ToString())

' This code produces the following output:
'
' E L P P a

Commenti

Questo metodo viene implementato tramite l'esecuzione posticipata.This method is implemented by using deferred execution. Il controllo immediato valore restituito è un oggetto che archivia tutte le informazioni necessarie per eseguire l'azione.The immediate return value is an object that stores all the information that is required to perform the action. La query rappresentata da questo metodo non viene eseguita fino a quando l'oggetto viene enumerata chiamando relativi GetEnumerator metodo direttamente o tramite foreach in Visual c# o For Each in Visual Basic.The query represented by this method is not executed until the object is enumerated either by calling its GetEnumerator method directly or by using foreach in Visual C# or For Each in Visual Basic.

A differenza di OrderBy, questo metodo di ordinamento non considera i valori effettivi per determinare l'ordine.Unlike OrderBy, this sorting method does not consider the actual values themselves in determining the order. Piuttosto, restituisce solo gli elementi in ordine inverso dal quale sono stati prodotti dall'origine sottostante.Rather, it just returns the elements in the reverse order from which they are produced by the underlying source.

Si applica a