ArrayList.Reverse 方法

定義

命名空間:
System.Collections
組件:
mscorlib.dll, System.Collections.NonGeneric.dll
組件:
mscorlib.dll
組件:
netstandard.dll

將元素順序 ArrayList 反轉，或其中一部分。

多載

名稱 Description
Reverse()

反轉整個 ArrayList中的項目順序。
Reverse(Int32, Int32)

反轉指定範圍中的項目順序。

Reverse()

反轉整個 ArrayList中的項目順序。

public:
 virtual void Reverse();
public virtual void Reverse();
abstract member Reverse : unit -> unit
override this.Reverse : unit -> unit
Public Overridable Sub Reverse ()

例外狀況

NotSupportedException

這是 ArrayList 唯讀的。

範例

以下程式碼範例展示了如何反轉 中值 ArrayList的排序順序。

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( "jumps" );
      myAL.Add( "over" );
      myAL.Add( "the" );
      myAL.Add( "lazy" );
      myAL.Add( "dog" );

      // Displays the values of the ArrayList.
      Console.WriteLine( "The ArrayList initially contains the following values:" );
      PrintValues( myAL );

      // Reverses the sort order of the values of the ArrayList.
      myAL.Reverse();

      // Displays the values of the ArrayList.
      Console.WriteLine( "After reversing:" );
      PrintValues( myAL );
   }

   public static void PrintValues( IEnumerable myList )  {
      foreach ( Object obj in myList )
         Console.WriteLine( "   {0}", obj );
      Console.WriteLine();
   }
}


/*
This code produces the following output.

The ArrayList initially contains the following values:
   The
   quick
   brown
   fox
   jumps
   over
   the
   lazy
   dog

After reversing:
   dog
   lazy
   the
   over
   jumps
   fox
   brown
   quick
   The
*/

Imports System.Collections

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("jumps")
        myAL.Add("over")
        myAL.Add("the")
        myAL.Add("lazy")
        myAL.Add("dog")
        
        ' Displays the values of the ArrayList.
        Console.WriteLine("The ArrayList initially contains the " _
           + "following values:")
        PrintValues(myAL)
        
        ' Reverses the sort order of the values of the ArrayList.
        myAL.Reverse()
        
        ' Displays the values of the ArrayList.
        Console.WriteLine("After reversing:")
        PrintValues(myAL)
    End Sub
    
    Public Shared Sub PrintValues(myList As IEnumerable)
        Dim obj As [Object]
        For Each obj In  myList
            Console.WriteLine("   {0}", obj)
        Next obj
        Console.WriteLine()
    End Sub

End Class


' This code produces the following output.
' 
' The ArrayList initially contains the following values:
'    The
'    quick
'    brown
'    fox
'    jumps
'    over
'    the
'    lazy
'    dog
'
' After reversing:
'    dog
'    lazy
'    the
'    over
'    jumps
'    fox
'    brown
'    quick
'    The

備註

此方法反Array.Reverse轉元素的順序，使得 [i] 處ArrayList的元素（其中 i 是該範圍內的任意索引）移動到 ArrayList [j]，其中 j 等於countindex + index + - i - 1。

此方法是一個 O(n) 運算，其中 n 為 Count。

適用於

Reverse(Int32, Int32)

反轉指定範圍中的項目順序。

public:
 virtual void Reverse(int index, int count);
public virtual void Reverse(int index, int count);
abstract member Reverse : int * int -> unit
override this.Reverse : int * int -> unit
Public Overridable Sub Reverse (index As Integer, count As Integer)

參數

index
Int32

範圍的起始指數為零，反向。

count
Int32

元素數量在範圍內反轉。

例外狀況

ArgumentOutOfRangeException

index 小於零。

-或-

count 小於零。

ArgumentException

index 且 count 不表示 中 ArrayList有效元素範圍。

NotSupportedException

這是 ArrayList 唯讀的。

範例

以下程式碼範例展示了如何反轉 在 中元素範圍內 ArrayList值的排序順序。

using System;
using System.Collections;
public class SamplesArrayList1  {

   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( "jumps" );
      myAL.Add( "over" );
      myAL.Add( "the" );
      myAL.Add( "lazy" );
      myAL.Add( "dog" );

      // Displays the values of the ArrayList.
      Console.WriteLine( "The ArrayList initially contains the following values:" );
      PrintValues( myAL );

      // Reverses the sort order of the values of the ArrayList.
      myAL.Reverse( 1, 3 );

      // Displays the values of the ArrayList.
      Console.WriteLine( "After reversing:" );
      PrintValues( myAL );
   }

   public static void PrintValues( IEnumerable myList )  {
      foreach ( Object obj in myList )
         Console.WriteLine( "   {0}", obj );
      Console.WriteLine();
   }
}


/*
This code produces the following output.

The ArrayList initially contains the following values:
   The
   QUICK
   BROWN
   FOX
   jumps
   over
   the
   lazy
   dog

After reversing:
   The
   FOX
   BROWN
   QUICK
   jumps
   over
   the
   lazy
   dog

*/

Imports System.Collections

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("jumps")
        myAL.Add("over")
        myAL.Add("the")
        myAL.Add("lazy")
        myAL.Add("dog")

        ' Displays the values of the ArrayList.
        Console.WriteLine("The ArrayList initially contains the following values:")
        PrintValues(myAL)

        ' Reverses the sort order of the values of the ArrayList.
        myAL.Reverse(1, 3)

        ' Displays the values of the ArrayList.
        Console.WriteLine("After reversing:")
        PrintValues(myAL)

    End Sub

    Public Shared Sub PrintValues(myList As IEnumerable)
        Dim obj As [Object]
        For Each obj In  myList
            Console.WriteLine("   {0}", obj)
        Next obj
        Console.WriteLine()
    End Sub

End Class


' This code produces the following output.
' 
' The ArrayList initially contains the following values:
'    The
'    QUICK
'    BROWN
'    FOX
'    jumps
'    over
'    the
'    lazy
'    dog
'
' After reversing:
'    The
'    FOX
'    BROWN
'    QUICK
'    jumps
'    over
'    the
'    lazy
'    dog

備註

此方法反Array.Reverse轉元素的順序，使得 [i] 處ArrayList的元素（其中 i 是該範圍內的任意索引）移動到 ArrayList [j]，其中 j 等於countindex + index + - i - 1。

此方法是一個 O(n) 運算，其中 n 為 count。

適用於