SortedList.TrimToSize メソッドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

SortedList.TrimToSize メソッド

容量を SortedList 内にある実際の要素数に設定します。

名前空間: System.Collections
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Overridable Sub TrimToSize

Visual Basic (使用法)

Dim instance As SortedList

instance.TrimToSize

public virtual void TrimToSize ()

C++

public:
virtual void TrimToSize ()

public void TrimToSize ()

JScript

public function TrimToSize ()

例外

例外の種類	条件
NotSupportedException	SortedList は読み取り専用です。または SortedList が固定サイズです。

例外の種類

条件

NotSupportedException

SortedList は読み取り専用です。

または

SortedList が固定サイズです。

解説

今後リストに要素が追加されないことがわかっている場合は、このメソッドを使用して、リストのメモリオーバーヘッドを最小化できます。

SortedList を初期状態にリセットするには、TrimToSize の前に、Clear を呼び出します。空の SortedList をトリムすると、SortedList の容量は既定値に設定されます。

このメソッドは O(n) 操作です。ここで、n は Count です。

使用例

SortedList の未使用部分をなくす方法と、SortedList の値を消去する方法の例を次に示します。

Visual Basic

Imports System
Imports System.Collections
Imports Microsoft.VisualBasic

Public Class SamplesSortedList    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new SortedList.
        Dim mySL As New
 SortedList()
        mySL.Add("one", "The")
        mySL.Add("two", "quick")
        mySL.Add("three", "brown")
        mySL.Add("four", "fox")
        mySL.Add("five", "jumped")
        
        ' Displays the count, capacity and values of the SortedList.
        Console.WriteLine("Initially,")
        Console.WriteLine("   Count    : {0}", mySL.Count)
        Console.WriteLine("   Capacity : {0}", mySL.Capacity)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(mySL)
        
        ' Trims the SortedList.
        mySL.TrimToSize()
        
        ' Displays the count, capacity and values of the SortedList.
        Console.WriteLine("After TrimToSize,")
        Console.WriteLine("   Count    : {0}", mySL.Count)
        Console.WriteLine("   Capacity : {0}", mySL.Capacity)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(mySL)
        
        ' Clears the SortedList.
        mySL.Clear()
        
        ' Displays the count, capacity and values of the SortedList.
        Console.WriteLine("After Clear,")
        Console.WriteLine("   Count    : {0}", mySL.Count)
        Console.WriteLine("   Capacity : {0}", mySL.Capacity)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(mySL)
        
        ' Trims the SortedList again.
        mySL.TrimToSize()
        
        ' Displays the count, capacity and values of the SortedList.
        Console.WriteLine("After the second TrimToSize,")
        Console.WriteLine("   Count    : {0}", mySL.Count)
        Console.WriteLine("   Capacity : {0}", mySL.Capacity)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(mySL)
    End Sub   
    
    
    Public Shared Sub PrintKeysAndValues(myList
 As SortedList)
        Console.WriteLine(ControlChars.Tab & "-KEY-"
 & ControlChars.Tab & _
           "-VALUE-")
        Dim i As Integer
        For i = 0 To myList.Count - 1
            Console.WriteLine(ControlChars.Tab & "{0}:"
 & ControlChars.Tab & _
               "{1}", myList.GetKey(i), myList.GetByIndex(i))
        Next i
        Console.WriteLine()
    End Sub
End Class

' This code produces the following output.
' 
' Initially,
'    Count    : 5
'    Capacity : 16
'    Values:
'     -KEY-    -VALUE-
'     five:    jumped
'     four:    fox
'     one:    The
'     three:    brown
'     two:    quick
'
' After TrimToSize,
'    Count    : 5
'    Capacity : 5
'    Values:
'     -KEY-    -VALUE-
'     five:    jumped
'     four:    fox
'     one:    The
'     three:    brown
'     two:    quick
' 
' After Clear,
'    Count    : 0
'    Capacity : 16
'    Values:
'     -KEY-    -VALUE-
' 
'
' After the second TrimToSize,
'    Count    : 0
'    Capacity : 16
'    Values:
'     -KEY-    -VALUE-

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

   public static void Main()
  {

      // Creates and initializes a new SortedList.
      SortedList mySL = new SortedList();
      mySL.Add( "one", "The" );
      mySL.Add( "two", "quick" );
      mySL.Add( "three", "brown" );
      mySL.Add( "four", "fox" );
      mySL.Add( "five", "jumped" );

      // Displays the count, capacity and values of the SortedList.
      Console.WriteLine( "Initially," );
      Console.WriteLine( "   Count    : {0}", mySL.Count );
      Console.WriteLine( "   Capacity : {0}", mySL.Capacity );
      Console.WriteLine( "   Values:" );
      PrintKeysAndValues( mySL );

      // Trims the SortedList.
      mySL.TrimToSize();

      // Displays the count, capacity and values of the SortedList.
      Console.WriteLine( "After TrimToSize," );
      Console.WriteLine( "   Count    : {0}", mySL.Count );
      Console.WriteLine( "   Capacity : {0}", mySL.Capacity );
      Console.WriteLine( "   Values:" );
      PrintKeysAndValues( mySL );

      // Clears the SortedList.
      mySL.Clear();

      // Displays the count, capacity and values of the SortedList.
      Console.WriteLine( "After Clear," );
      Console.WriteLine( "   Count    : {0}", mySL.Count );
      Console.WriteLine( "   Capacity : {0}", mySL.Capacity );
      Console.WriteLine( "   Values:" );
      PrintKeysAndValues( mySL );

      // Trims the SortedList again.
      mySL.TrimToSize();

      // Displays the count, capacity and values of the SortedList.
      Console.WriteLine( "After the second TrimToSize," );
      Console.WriteLine( "   Count    : {0}", mySL.Count );
      Console.WriteLine( "   Capacity : {0}", mySL.Capacity );
      Console.WriteLine( "   Values:" );
      PrintKeysAndValues( mySL );
   }


   public static void PrintKeysAndValues(
 SortedList myList )  {
      Console.WriteLine( "\t-KEY-\t-VALUE-" );
      for ( int i = 0; i < myList.Count;
 i++ )  {
         Console.WriteLine( "\t{0}:\t{1}", myList.GetKey(i), myList.GetByIndex(i)
 );
      }
      Console.WriteLine();
   }
}
/* 
This code produces the following output.

Initially,
   Count    : 5
   Capacity : 16
   Values:
    -KEY-    -VALUE-
    five:    jumped
    four:    fox
    one:    The
    three:    brown
    two:    quick

After TrimToSize,
   Count    : 5
   Capacity : 5
   Values:
    -KEY-    -VALUE-
    five:    jumped
    four:    fox
    one:    The
    three:    brown
    two:    quick

After Clear,
   Count    : 0
   Capacity : 16
   Values:
    -KEY-    -VALUE-

After the second TrimToSize,
   Count    : 0
   Capacity : 16
   Values:
    -KEY-    -VALUE-
*/

C++

#using <system.dll>

using namespace System;
using namespace System::Collections;
void PrintKeysAndValues( SortedList^ myList )
{
   Console::WriteLine(  "\t-KEY-\t-VALUE-" );
   for ( int i = 0; i < myList->Count;
 i++ )
   {
      Console::WriteLine(  "\t{0}:\t{1}", myList->GetKey( i ), myList->GetByIndex(
 i ) );

   }
   Console::WriteLine();
}

int main()
{
   
   // Creates and initializes a new SortedList.
   SortedList^ mySL = gcnew SortedList;
   mySL->Add( "one", "The" );
   mySL->Add( "two", "quick" );
   mySL->Add( "three", "brown" );
   mySL->Add( "four", "fox" );
   mySL->Add( "five", "jumped" );
   
   // Displays the count, capacity and values of the SortedList.
   Console::WriteLine(  "Initially," );
   Console::WriteLine(  "   Count    : {0}", mySL->Count );
   Console::WriteLine(  "   Capacity : {0}", mySL->Capacity );
   Console::WriteLine(  "   Values:" );
   PrintKeysAndValues( mySL );
   
   // Trims the SortedList.
   mySL->TrimToSize();
   
   // Displays the count, capacity and values of the SortedList.
   Console::WriteLine(  "After TrimToSize," );
   Console::WriteLine(  "   Count    : {0}", mySL->Count );
   Console::WriteLine(  "   Capacity : {0}", mySL->Capacity );
   Console::WriteLine(  "   Values:" );
   PrintKeysAndValues( mySL );
   
   // Clears the SortedList.
   mySL->Clear();
   
   // Displays the count, capacity and values of the SortedList.
   Console::WriteLine(  "After Clear," );
   Console::WriteLine(  "   Count    : {0}", mySL->Count );
   Console::WriteLine(  "   Capacity : {0}", mySL->Capacity );
   Console::WriteLine(  "   Values:" );
   PrintKeysAndValues( mySL );
   
   // Trims the SortedList again.
   mySL->TrimToSize();
   
   // Displays the count, capacity and values of the SortedList.
   Console::WriteLine(  "After the second TrimToSize," );
   Console::WriteLine(  "   Count    : {0}", mySL->Count );
   Console::WriteLine(  "   Capacity : {0}", mySL->Capacity );
   Console::WriteLine(  "   Values:" );
   PrintKeysAndValues( mySL );
}

/* 
This code produces the following output.

Initially,
   Count    : 5
   Capacity : 16
   Values:
        -KEY-   -VALUE-
        five:   jumped
        four:   fox
        one:    The
        three:  brown
        two:    quick

After TrimToSize,
   Count    : 5
   Capacity : 5
   Values:
        -KEY-   -VALUE-
        five:   jumped
        four:   fox
        one:    The
        three:  brown
        two:    quick

After Clear,
   Count    : 0
   Capacity : 16
   Values:
        -KEY-   -VALUE-

After the second TrimToSize,
   Count    : 0
   Capacity : 16
   Values:
        -KEY-   -VALUE-

*/

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

public class SamplesSortedList
{
    public static void main(String[]
 args)
    {
        // Creates and initializes a new SortedList.
        SortedList mySL = new SortedList();

        mySL.Add("one", "The");
        mySL.Add("two", "quick");
        mySL.Add("three", "brown");
        mySL.Add("four", "fox");
        mySL.Add("five", "jumped");

        // Displays the count, capacity and values of the SortedList.
        Console.WriteLine("Initially,");
        Console.WriteLine("   Count    : {0}", 
            System.Convert.ToString(mySL.get_Count()));
        Console.WriteLine("   Capacity : {0}", 
            System.Convert.ToString(mySL.get_Capacity()));
        Console.WriteLine("   Values:");
        PrintKeysAndValues(mySL);

        // Trims the SortedList.
        mySL.TrimToSize();

        // Displays the count, capacity and values of the SortedList.
        Console.WriteLine("After TrimToSize,");
        Console.WriteLine("   Count    : {0}", 
            System.Convert.ToString(mySL.get_Count()));
        Console.WriteLine("   Capacity : {0}", 
            System.Convert.ToString(mySL.get_Capacity()));
        Console.WriteLine("   Values:");
        PrintKeysAndValues(mySL);

        // Clears the SortedList.
        mySL.Clear();

        // Displays the count, capacity and values of the SortedList.
        Console.WriteLine("After Clear,");
        Console.WriteLine("   Count    : {0}", 
            System.Convert.ToString(mySL.get_Count()));
        Console.WriteLine("   Capacity : {0}", 
            System.Convert.ToString(mySL.get_Capacity()));
        Console.WriteLine("   Values:");
        PrintKeysAndValues(mySL);

        // Trims the SortedList again.
        mySL.TrimToSize();

        // Displays the count, capacity and values of the SortedList.
        Console.WriteLine("After the second TrimToSize,");
        Console.WriteLine("   Count    : {0}", 
            System.Convert.ToString(mySL.get_Count()));
        Console.WriteLine("   Capacity : {0}", 
            System.Convert.ToString(mySL.get_Capacity()));
        Console.WriteLine("   Values:");
        PrintKeysAndValues(mySL);
    } //main

    public static void PrintKeysAndValues(SortedList
 myList)
    {
        Console.WriteLine("\t-KEY-\t-VALUE-");
        for (int i = 0; i < myList.get_Count();
 i++) {
            Console.WriteLine("\t{0}:\t{1}", myList.GetKey(i), 
                myList.GetByIndex(i));
        }
        Console.WriteLine();
    } //PrintKeysAndValues

} //SamplesSortedList

/* 
 This code produces the following output.
 
 Initially,
    Count    : 5
    Capacity : 16
    Values:
     -KEY-    -VALUE-
     five:    jumped
     four:    fox
     one:    The
     three:    brown
     two:    quick
 
 After TrimToSize,
    Count    : 5
    Capacity : 5
    Values:
     -KEY-    -VALUE-
     five:    jumped
     four:    fox
     one:    The
     three:    brown
     two:    quick
 
 After Clear,
    Count    : 0
    Capacity : 16
    Values:
     -KEY-    -VALUE-
 
 After the second TrimToSize,
    Count    : 0
    Capacity : 16
    Values:
     -KEY-    -VALUE-
 */

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0

参照

関連項目
SortedList クラス
SortedList メンバ
System.Collections 名前空間
Clear
Capacity
Count

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SortedList.TrimToSize メソッドとは？ わかりやすく解説

SortedList.TrimToSize メソッド

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SortedList.TrimToSize メソッドとは？わかりやすく解説