ListBox.Sort メソッド

.NET Framework クラス ライブラリ リファレンス

ListBox.Sort メソッド

ListBox 内の項目を並べ替えます。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文

Visual Basic (宣言)

Protected Overridable Sub
 Sort

Visual Basic (使用法)

Me.Sort

C#

protected virtual void Sort ()

C++

protected:
virtual void Sort ()

J#

protected void Sort ()

JScript

protected function Sort ()

解説

Sorted プロパティが true の場合、Sort は、コレクションに各項目の追加を強制的に再実行させます。その後、各項目が正しい位置に挿入されます。

継承時の注意 派生クラスでこのメソッドをオーバーライドして、独自の並べ替えルーチンを指定できます。オーバーライドされた Sort メソッドの結果にアクセスするには、Sorted プロパティを true に設定します。項目を ListBox に追加するときは、既存の項目を並べ替えてから新しい項目を追加した方が効率的です。

使用例

Sort メソッドを使用するコード例を次に示します。この例では、ListBox クラスから継承し、派生クラスで Sort メソッドをオーバーライドして、ユーザー定義の並べ替えを実行する方法を示します。この例を実行するには、次のコードを空のフォームに貼り付けます。

Visual Basic

Imports System.Drawing
Imports System.Windows.Forms

Public Class Form1
    Inherits System.Windows.Forms.Form

    Public Sub New()
        MyBase.New()
        Me.Button1 = New System.Windows.Forms.Button
        Me.SortByLengthListBox1 = New SortByLengthListBox
        Me.SuspendLayout()
        Me.Button1.Location = New System.Drawing.Point(64,
 16)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(176,
 23)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Click me for list
 sorted by length"
        Me.SortByLengthListBox1.Items.AddRange(New
 Object() {"System", _
            "System.Windows.Forms", "System.Xml",
 _
            "System.Net", "System.Drawing",
 "System.IO"})
        Me.SortByLengthListBox1.Location = New
 System.Drawing.Point(72, 48)
        Me.SortByLengthListBox1.Name = "SortByLengthListBox1"
        Me.SortByLengthListBox1.Size = New
 System.Drawing.Size(120, 95)
        Me.SortByLengthListBox1.TabIndex = 1
        Me.ClientSize = New System.Drawing.Size(292,
 266)
        Me.Controls.Add(Me.SortByLengthListBox1)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Sort Example"
        Me.ResumeLayout(False)

    End Sub

    Friend WithEvents Button1 As
 System.Windows.Forms.Button
    Friend WithEvents SortByLengthListBox1
 As SortByLengthListBox

    Public Shared Sub Main()
        Application.Run(New Form1)
    End Sub

    
    Private Sub Button1_Click(ByVal
 sender As System.Object, _
        ByVal e As System.EventArgs) Handles
 Button1.Click

        ' Set the Sorted property to True to raise the overridden Sort
        ' method.
        SortByLengthListBox1.Sorted = True
    End Sub
End Class

' This class inherits from ListBox and implements a different 
' sorting method. Sort will be called by setting the class's Sorted
' property to True.
Public Class SortByLengthListBox
    Inherits ListBox

    Public Sub New()
        MyBase.New()
    End Sub

    ' Overrides the parent class Sort to perform a simple
    ' bubble sort on the length of the string contained in each item.
    Protected Overrides Sub
 Sort()
        If (Items.Count > 1) Then

            Dim swapped As Boolean

            Do
                Dim counter As Integer
 = Items.Count - 1
                swapped = False
                While (counter - 1 > 0)

                    ' Compare the items' length.
                    If Items(counter).ToString.Length < _
                       Items(counter - 1).ToString.Length Then

                        ' If true, swap the items.
                        Dim temp As Object
 = Items(counter)
                        Items(counter) = Items(counter - 1)
                        Items(counter - 1) = temp
                        swapped = True

                    End If
                    ' Decrement the counter.
                    counter -= 1
                End While
            Loop While (swapped = True)
        End If
    End Sub

End Class

C#

// The following code example demonstrates using the ListBox.Sort method
// by inheriting from the ListBox class and overriding the Sort method.


using System.Drawing;
using System.Windows.Forms;

public class Form1:
    System.Windows.Forms.Form
{

    internal System.Windows.Forms.Button Button1;
    internal SortByLengthListBox sortingBox;
    
    public Form1() : base()
    {        
        this.Button1 = new System.Windows.Forms.Button();
        this.sortingBox = 
            new SortByLengthListBox();
        this.SuspendLayout();
        this.Button1.Location = new System.Drawing.Point(64,
 16);
        this.Button1.Name = "Button1";
        this.Button1.Size = new System.Drawing.Size(176,
 23);
        this.Button1.TabIndex = 0;
        this.Button1.Text = "Click me for
 list sorted by length";
        this.Button1.Click += new System.EventHandler(Button1_Click);
        this.sortingBox.Items.AddRange(new
 object[]{"System", 
            "System.Windows.Forms", "System.Xml", "System.Net",
 
            "System.Drawing", "System.IO"});
        this.sortingBox.Location = 
            new System.Drawing.Point(72, 48);
        this.sortingBox.Size = 
            new System.Drawing.Size(120, 95);
        this.sortingBox.TabIndex = 1;
        this.ClientSize = new System.Drawing.Size(292,
 266);
        this.Controls.Add(this.sortingBox);
        this.Controls.Add(this.Button1);
        this.Name = "Form1";
        this.Text = "Sort Example";
        this.ResumeLayout(false);
    }
    
       public static void
 Main()
    {
        Application.Run(new Form1());
    }

    
    private void Button1_Click(System.Object
 sender, System.EventArgs e)
    {
        // Set the Sorted property to True to raise the overridden Sort
        // method.
        sortingBox.Sorted = true;
    }
}

// This class inherits from ListBox and implements a different 
// sorting method. Sort will be called by setting the class's Sorted
// property to True.
public class SortByLengthListBox:
    ListBox

{
    public SortByLengthListBox() : base()
    {        
    }

    // Overrides the parent class Sort to perform a simple
    // bubble sort on the length of the string contained in each item.
    protected override void Sort()
    {
        if (Items.Count > 1)
        {
            bool swapped;
            do
            {
                int counter = Items.Count - 1;
                swapped = false;
                
                while (counter - 1 > 0)
                {
                    // Compare the items' length. 
                    if (Items[counter].ToString().Length  
                        < Items[counter-1].ToString().Length)
                    {
                        // Swap the items.
                        object temp = Items[counter];
                        Items[counter] = Items[counter-1];
                        Items[counter-1] = temp;
                        swapped = true;
                    }
                    // Decrement the counter.
                    counter -= 1;
                }
            }
            while((swapped==true));
        }
    }
}

C++

// The following code example demonstrates using the ListBox.Sort method
// by inheriting from the ListBox class and overriding the Sort method.
using namespace System::Drawing;
using namespace System::Windows::Forms;

// This class inherits from ListBox and implements a different 
// sorting method. Sort will be called by setting the class's Sorted
// property to True.
public ref class SortByLengthListBox: public
 ListBox
{
public:
   SortByLengthListBox()
      : ListBox()
   {}

protected:

   // Overrides the parent class Sort to perform a simple
   // bubble sort on the length of the string contained in each item.
   virtual void Sort() override
   {
      if ( Items->Count > 1 )
      {
         bool swapped;
         do
         {
            int counter = Items->Count - 1;
            swapped = false;
            while ( counter - 1 > 0 )
            {
               
               // Compare the items' length. 
               if ( Items[ counter ]->ToString()->Length
 < Items[ counter - 1 ]->ToString()->Length )
               {
                  
                  // Swap the items.
                  Object^ temp = Items[ counter ];
                  Items[ counter ] = Items[ counter - 1 ];
                  Items[ counter - 1 ] = temp;
                  swapped = true;
               }
               
               // Decrement the counter.
               counter -= 1;
            }
         }
         while ( (swapped == true) );
      }
   }
};

public ref class Form1: public
 System::Windows::Forms::Form
{
internal:
   System::Windows::Forms::Button^ Button1;
   SortByLengthListBox^ sortingBox;

public:
   Form1()
      : Form()
   {
      this->Button1 = gcnew System::Windows::Forms::Button;
      this->sortingBox = gcnew SortByLengthListBox;
      this->SuspendLayout();
      this->Button1->Location = System::Drawing::Point(
 64, 16 );
      this->Button1->Name = "Button1";
      this->Button1->Size = System::Drawing::Size( 176,
 23 );
      this->Button1->TabIndex = 0;
      this->Button1->Text = "Click me for
 list sorted by length";
      this->Button1->Click += gcnew System::EventHandler(
 this, &Form1::Button1_Click );
      array<Object^>^temp0 = {"System","System.Windows.Forms"
,"System.Xml","System.Net","System.Drawing","System.IO"};
      this->sortingBox->Items->AddRange( temp0 );
      this->sortingBox->Location = System::Drawing::Point(
 72, 48 );
      this->sortingBox->Size = System::Drawing::Size( 120,
 95 );
      this->sortingBox->TabIndex = 1;
      this->ClientSize = System::Drawing::Size( 292, 266 );
      this->Controls->Add( this->sortingBox
 );
      this->Controls->Add( this->Button1
 );
      this->Name = "Form1";
      this->Text = "Sort Example";
      this->ResumeLayout( false );
   }

private:
   void Button1_Click( System::Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      // Set the Sorted property to True to raise the overridden Sort
      // method.
      sortingBox->Sorted = true;
   }

};

int main()
{
   Application::Run( gcnew Form1 );
}

J#

// The following code example demonstrates using the ListBox.Sort method
// by inheriting from the ListBox class and overriding the Sort method.
import System.Drawing.*;
import System.Windows.Forms.*;

public class Form1 extends System.Windows.Forms.Form
{
    private System.Windows.Forms.Button button1;
    private SortByLengthListBox sortingBox;

    public Form1()
    {
        this.button1 = new System.Windows.Forms.Button();
        this.sortingBox = new SortByLengthListBox();
        this.SuspendLayout();
        this.button1.set_Location(new System.Drawing.Point(64,
 16));
        this.button1.set_Name("Button1");
        this.button1.set_Size(new System.Drawing.Size(176,
 23));
        this.button1.set_TabIndex(0);
        this.button1.set_Text("Click me for
 list sorted by length");
        this.button1.add_Click(new System.EventHandler(button1_Click));
        this.sortingBox.get_Items().AddRange(new
 Object[] { "System", 
            "System.Windows.Forms", "System.Xml", "System.Net",
 
            "System.Drawing", "System.IO" });
        this.sortingBox.set_Location(new System.Drawing.Point(72,
 48));
        this.sortingBox.set_Size(new System.Drawing.Size(120,
 95));
        this.sortingBox.set_TabIndex(1);
        this.set_ClientSize(new System.Drawing.Size(292,
 266));
        this.get_Controls().Add(this.sortingBox);
        this.get_Controls().Add(this.button1);
        this.set_Name("Form1");
        this.set_Text("Sort Example");
        this.ResumeLayout(false);
    } //Form1

    public static void main(String[]
 args)
    {
        Application.Run(new Form1());
    } //main

    private void button1_Click(Object sender,
 System.EventArgs e)
    {
        // Set the Sorted property to True to raise the overridden Sort
        // method.
        sortingBox.set_Sorted(true);
    } //button1_Click
} //Form1

// This class inherits from ListBox and implements a different 
// sorting method. Sort will be called by setting the class's Sorted
// property to True.
public class SortByLengthListBox extends ListBox
{
    public SortByLengthListBox()
    {
        super();
    } //SortByLengthListBox

    // Overrides the parent class Sort to perform a simple
    // bubble sort on the length of the string contained in each item.
    protected void Sort()
    {
        if (get_Items().get_Count() > 1) {
            boolean swapped;
            do {
                int counter = get_Items().get_Count() - 1;
                swapped = false;

                while (counter - 1 > 0) {
                    // Compare the items' length. 
                    if (get_Items().get_Item(counter).ToString().get_Length()
 
                        < get_Items().get_Item((counter - 1)).
                        ToString().get_Length()) {
                        // Swap the items.
                        Object temp = get_Items().get_Item(counter);
                        get_Items().set_Item(counter, get_Items().
                            get_Item((counter - 1)));
                        get_Items().set_Item((counter - 1), temp);
                        swapped = true;
                    }
                    // Decrement the counter.
                    counter -= 1;
                }
            } while (swapped == true);
        }
    } //Sort
} //SortByLengthListBox

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, 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

参照

関連項目
ListBox クラス
ListBox メンバ
System.Windows.Forms 名前空間
Sorted