ArrayList.Reverse 方法

参考

定义

命名空间:: System.Collections

程序集:: mscorlib.dll, System.Collections.NonGeneric.dll

程序集:: System.Runtime.dll

程序集:: System.Collections.NonGeneric.dll

程序集:: System.Runtime.Extensions.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

将 ArrayList 或它的一部分中元素的顺序反转。

重载

Reverse()	将整个 ArrayList 中元素的顺序反转。
Reverse(Int32, Int32)	将指定范围中元素的顺序反转。

Reverse()

Source:: ArrayList.cs

Source:: ArrayList.cs

Source:: ArrayList.cs

将整个 ArrayList 中元素的顺序反转。

public:
 virtual void Reverse();

public virtual void Reverse ();

abstract member Reverse : unit -> unit
override this.Reverse : unit -> unit

Public Overridable Sub Reverse ()

例外

NotSupportedException

ArrayList 为只读。

示例

下面的代码示例演示如何反转中 ArrayList值的排序顺序。

using namespace System;
using namespace System::Collections;
void PrintValues( IEnumerable^ myList );
int main()
{
   
   // Creates and initializes a new ArrayList.
   ArrayList^ myAL = gcnew 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 );
}

void PrintValues( IEnumerable^ myList )
{
   IEnumerator^ myEnum = myList->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ obj = safe_cast<Object^>(myEnum->Current);
      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
 */

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

注解

此方法使用 Array.Reverse 反转元素的顺序，使 [i] 中的ArrayList元素（其中 i 是范围内的任何索引）移动到 ArrayList [j]，其中 j 等于countindex + index + - i - 1。

此方法是一个 O(n) 操作，其中 n 为 Count。

适用于

Reverse(Int32, Int32)

Source:: ArrayList.cs

Source:: ArrayList.cs

Source:: ArrayList.cs

将指定范围中元素的顺序反转。

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)

参数

index: Int32

要反转的范围的从零开始的起始索引。

count: Int32

要反转的范围内的元素数。

例外

ArgumentOutOfRangeException

index 小于零。

- 或 -

count 小于零。

ArgumentException

index 和 count 不表示 ArrayList 中元素的有效范围。

NotSupportedException

ArrayList 为只读。

示例

下面的代码示例演示如何反转中元素 ArrayList范围中的值的排序顺序。

using namespace System;
using namespace System::Collections;
void PrintValues( IEnumerable^ myList );
int main()
{
   
   // Creates and initializes a new ArrayList.
   ArrayList^ myAL = gcnew 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 );
}

void PrintValues( IEnumerable^ myList )
{
   IEnumerator^ myEnum = myList->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ obj = safe_cast<Object^>(myEnum->Current);
      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

 */

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

注解

此方法是一个 O(n) 操作，其中 n 为 count。

适用于

ArrayList.Reverse 方法

定义

重载

Reverse()

例外

示例

注解

适用于

Reverse(Int32, Int32)

参数

例外

示例

注解

适用于

反馈

其他资源