ArrayList.Repeat 方法

项目
08/17/2007

返回 ArrayList，它的元素是指定值的副本。

**命名空间:**System.Collections
**程序集:**mscorlib（在 mscorlib.dll 中）

语法

声明
Public Shared Function Repeat ( _
    value As Object, _
    count As Integer _
) As ArrayList
用法
Dim value As Object
Dim count As Integer
Dim returnValue As ArrayList

returnValue = ArrayList.Repeat(value, count)

public static ArrayList Repeat (
    Object value,
    int count
)

public:
static ArrayList^ Repeat (
    Object^ value, 
    int count
)

public static ArrayList Repeat (
    Object value, 
    int count
)

public static function Repeat (
    value : Object, 
    count : int
) : ArrayList

参数

value
要在新 ArrayList 中对其进行多次复制的 Object。该值可以为空引用（在 Visual Basic 中为 Nothing）。

count
value 应被复制的次数。

返回值

具有 count 所指定的元素数的 ArrayList，其中的所有元素都是 value 的副本。

异常

异常类型	条件
ArgumentOutOfRangeException	count 小于零。

备注

ArrayList 接受空引用（在 Visual Basic 中为 Nothing）作为有效值并且允许重复的元素。

此方法的运算复杂度为 O(n)，其中 n 是 count。

示例

下面的代码示例演示如何用同一个值创建和初始化新 ArrayList。

Imports System
Imports System.Collections
Imports Microsoft.VisualBasic

Public Class SamplesArrayList    

    Public Shared Sub Main()

        ' Creates a new ArrayList with five elements and initialize each
        ' element with a null value.
        Dim myAL As ArrayList = ArrayList.Repeat(Nothing, 5)

        ' Displays the count, capacity and values of the ArrayList.
        Console.WriteLine("ArrayList with five elements with a null value")
        Console.WriteLine("   Count    : {0}", myAL.Count)
        Console.WriteLine("   Capacity : {0}", myAL.Capacity)
        Console.Write("   Values:")
        PrintValues(myAL)

        ' Creates a new ArrayList with seven elements and initialize each
        ' element with the string "abc".
        myAL = ArrayList.Repeat("abc", 7)

        ' Displays the count, capacity and values of the ArrayList.
        Console.WriteLine("ArrayList with seven elements with a string value")
        Console.WriteLine("   Count    : {0}", myAL.Count)
        Console.WriteLine("   Capacity : {0}", myAL.Capacity)
        Console.Write("   Values:")
        PrintValues(myAL)

    End Sub 'Main

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

End Class


' This code produces the following output.
' 
' ArrayList with five elements with a null value
'    Count    : 5
'    Capacity : 16
'    Values:                    
' ArrayList with seven elements with a string value
'    Count    : 7
'    Capacity : 16
'    Values:    abc abc abc abc abc abc abc

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

   public static void Main()  {

      // Creates a new ArrayList with five elements and initialize each element with a null value.
      ArrayList myAL = ArrayList.Repeat( null, 5 );

      // Displays the count, capacity and values of the ArrayList.
      Console.WriteLine( "ArrayList with five elements with a null value" );
      Console.WriteLine( "   Count    : {0}", myAL.Count );
      Console.WriteLine( "   Capacity : {0}", myAL.Capacity );
      Console.Write( "   Values:" );
      PrintValues( myAL );

      // Creates a new ArrayList with seven elements and initialize each element with the string "abc".
      myAL = ArrayList.Repeat( "abc", 7 );

      // Displays the count, capacity and values of the ArrayList.
      Console.WriteLine( "ArrayList with seven elements with a string value" );
      Console.WriteLine( "   Count    : {0}", myAL.Count );
      Console.WriteLine( "   Capacity : {0}", myAL.Capacity );
      Console.Write( "   Values:" );
      PrintValues( myAL );

   }

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

}
/* 
This code produces the following output.

ArrayList with five elements with a null value
   Count    : 5
   Capacity : 16
   Values:
ArrayList with seven elements with a string value
   Count    : 7
   Capacity : 16
   Values:   abc   abc   abc   abc   abc   abc   abc

*/

using namespace System;
using namespace System::Collections;
void PrintValues( IEnumerable^ myList );
int main()
{
   
   // Creates a new ArrayList with five elements and initialize each element with a null value.
   ArrayList^ myAL = ArrayList::Repeat( 0, 5 );
   
   // Displays the count, capacity and values of the ArrayList.
   Console::WriteLine( "ArrayList with five elements with a null value" );
   Console::WriteLine( "   Count    : {0}", myAL->Count );
   Console::WriteLine( "   Capacity : {0}", myAL->Capacity );
   Console::Write( "   Values:" );
   PrintValues( myAL );
   
   // Creates a new ArrayList with seven elements and initialize each element with the string "abc".
   myAL = ArrayList::Repeat( "abc", 7 );
   
   // Displays the count, capacity and values of the ArrayList.
   Console::WriteLine( "ArrayList with seven elements with a string value" );
   Console::WriteLine( "   Count    : {0}", myAL->Count );
   Console::WriteLine( "   Capacity : {0}", myAL->Capacity );
   Console::Write( "   Values:" );
   PrintValues( myAL );
}

void PrintValues( IEnumerable^ myList )
{
   IEnumerator^ myEnum = myList->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ obj = safe_cast<Object^>(myEnum->Current);
      Console::Write( "   {0}", obj );
   }

   Console::WriteLine();
}

/* 
 This code produces the following output.
 
 ArrayList with five elements with a null value
    Count    : 5
    Capacity : 16
    Values:
 ArrayList with seven elements with a string value
    Count    : 7
    Capacity : 16
    Values:   abc   abc   abc   abc   abc   abc   abc

 */

import System.*;
import System.Collections.*;

public class SamplesArrayList
{
    public static void main(String[] args)
    {
        // Creates a new ArrayList with five elements and initialize each 
        // element with a null value.
        ArrayList myAL = ArrayList.Repeat(null, 5);

        // Displays the count, capacity and values of the ArrayList.
        Console.WriteLine("ArrayList with five elements with a null value");
        Console.WriteLine("   Count    : {0}", (Int32)myAL.get_Count());
        Console.WriteLine("   Capacity : {0}", (Int32)myAL.get_Capacity());
        Console.Write("   Values:");
        PrintValues(myAL);

        // Creates a new ArrayList with seven elements and initialize each 
        // element with the string "abc".
        myAL = ArrayList.Repeat("abc", 7);

        // Displays the count, capacity and values of the ArrayList.
        Console.WriteLine("ArrayList with seven elements with a string value");
        Console.WriteLine("   Count    : {0}", (Int32)myAL.get_Count());
        Console.WriteLine("   Capacity : {0}", (Int32)myAL.get_Capacity());
        Console.Write("   Values:");
        PrintValues(myAL);
    } //main

    public static void PrintValues(IEnumerable myList)
    {
        IEnumerator objMyEnum = myList.GetEnumerator();
        while (objMyEnum.MoveNext()) {
            Object obj = objMyEnum.get_Current();
            Console.Write("   {0}", obj);
        }
        Console.WriteLine();
    } //PrintValues
} //SamplesArrayList 
/* 
 This code produces the following output.
 
 ArrayList with five elements with a null value
    Count    : 5
    Capacity : 16
    Values:
 ArrayList with seven elements with a string value
    Count    : 7
    Capacity : 16
    Values:   abc   abc   abc   abc   abc   abc   abc

 */

import System;
import System.Collections;

// Creates a new ArrayList with five elements and initialize each element with a null value.
var myAL : ArrayList = ArrayList.Repeat( null, 5 );

// Displays the count, capacity and values of the ArrayList.
Console.WriteLine( "ArrayList with five elements with a null value" );
Console.WriteLine( "   Count    : {0}", myAL.Count );
Console.WriteLine( "   Capacity : {0}", myAL.Capacity );
Console.Write( "   Values:" );
PrintValues( myAL );

// Creates a new ArrayList with seven elements and initialize each element with the string "abc".
myAL = ArrayList.Repeat( "abc", 7 );

// Displays the count, capacity and values of the ArrayList.
Console.WriteLine( "ArrayList with seven elements with a string value" );
Console.WriteLine( "   Count    : {0}", myAL.Count );
Console.WriteLine( "   Capacity : {0}", myAL.Capacity );
Console.Write( "   Values:" );
PrintValues( myAL );

function PrintValues( myList : IEnumerable )  {
   var myEnumerator : System.Collections.IEnumerator  = myList.GetEnumerator();
   while ( myEnumerator.MoveNext() )
      Console.Write( "\t{0}", myEnumerator.Current );
   Console.WriteLine();
}
 /* 
 This code produces the following output.
 
 ArrayList with five elements with a null value
    Count    : 5
    Capacity : 16
    Values:                 
 ArrayList with seven elements with a string value
    Count    : 7
    Capacity : 16
    Values: abc abc abc abc abc abc abc
 */

平台

Windows 98、Windows 2000 SP4、Windows Millennium Edition、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

通过

ArrayList.Repeat 方法

语法

参数

返回值

异常

备注

示例

平台

版本信息

.NET Framework

请参见

参考

其他资源