CheckedListBox クラスとは何？わかりやすく解説 Weblio辞書

.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

CheckedListBox クラス

各項目の左側にチェックボックスが表示される ListBox を表示します。

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)

<ComVisibleAttribute(True)> _
<ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)> _
Public Class CheckedListBox
    Inherits ListBox

Visual Basic (使用法)

Dim instance As CheckedListBox

[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)] 
public class CheckedListBox : ListBox

C++

[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType::AutoDispatch)] 
public ref class CheckedListBox : public
 ListBox

/** @attribute ComVisibleAttribute(true) */ 
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) */ 
public class CheckedListBox extends ListBox

JScript

ComVisibleAttribute(true) 
ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) 
public class CheckedListBox extends
 ListBox

解説

このコントロールは、キーボード、またはコントロールの右側にあるスクロールバーを使用して移動できる項目のリストを示します。ユーザーは 1 つ以上の項目にチェックマークを付けることができ、CheckedListBox.CheckedItemCollection および CheckedListBox.CheckedIndexCollection を使用して、チェックした項目の間を移動できます。

実行時にオブジェクトをリストに追加するには、オブジェクト参照の配列を AddRange メソッドを使用して割り当てます。各オブジェクトの既定の文字列値がリストに表示されます。Add メソッドを使用して、個別の項目をリストに追加できます。

CheckedListBox オブジェクトは、CheckState 列挙体を使用して、3 つの状態 (Checked、Indeterminate、および Unchecked) をサポートします。Indeterminate の状態は、CheckedListBox のユーザーインターフェイスに設定のための機構が用意されていないため、コードで設定する必要があります。

UseTabStops が true の場合、CheckedListBox は項目のテキスト内のタブ文字を認識して展開し、列を作成します。ただし、タブストップは事前設定され、変更はできません。

CheckedListBox クラスは、次の 3 つのインデックス付きコレクションをサポートします。

コレクション	クラスのカプセル化
CheckedListBox コントロールに格納されているすべての項目。	CheckedListBox.ObjectCollection
チェックされた項目 (中間状態の項目を含む) であり、CheckedListBox コントロールに格納されている項目のサブセット。	CheckedListBox.CheckedItemCollection
チェックされているインデックスであり、項目のコレクションへのインデックスのサブセット。これらのインデックスで、チェックされている状態または中間状態の項目を指定します。	CheckedListBox.CheckedIndexCollection

CheckedListBox クラスがサポートする 3 つのインデックス付きコレクションの例を次の 3 つの表に示します。

1 番目の表では、コントロールの項目 (コントロールに格納されているすべての項目) のインデックス付きコレクションの例を示しています。

インデックス	項目	チェックの状態
0	オブジェクト 1	Unchecked
1	オブジェクト 2	Checked
2	オブジェクト 3	Unchecked
3	オブジェクト 4	Indeterminate
4	オブジェクト 5	Checked

2 番目の表では、チェックされている項目のインデックス付きコレクションの例を示しています。

インデックス	項目
0	オブジェクト 2
1	オブジェクト 4
2	オブジェクト 5

3 番目の表では、チェックされている項目のインデックスのインデックス付きコレクションの例を示しています。

インデックス	項目のインデックス
0	1
1	3
2	4

メモ CheckedListBox にはデータをバインドできません。代わりに、ComboBox または ListBox を使用します。詳細については、「方法 : Windows フォームの ComboBox または ListBox コントロールをデータにバインドする」を参照してください。

使用例

CheckedListBox のメソッド、プロパティ、およびコレクションの使い方の例を次に示します。これは完成されたサンプルであるため、プロジェクトにコピーすると実行できます。項目をチェックしたり解除したり、テキストボックスを使用して項目を追加したりできます。保存ボタンをクリックすると、チェックした項目がクリアされます。

Visual Basic

Option Explicit
Option Strict

Imports System
Imports System.Drawing
Imports System.Collections
Imports System.ComponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.IO

Namespace WindowsApplication1
    Public Class Form1
        Inherits System.Windows.Forms.Form
        Private WithEvents checkedListBox1
 As System.Windows.Forms.CheckedListBox
        Private WithEvents textBox1 As
 System.Windows.Forms.TextBox
        Private WithEvents button1 As
 System.Windows.Forms.Button
        Private WithEvents button2 As
 System.Windows.Forms.Button
        Private WithEvents listBox1 As
 System.Windows.Forms.ListBox
        Private WithEvents button3 As
 System.Windows.Forms.Button
        Private components As System.ComponentModel.Container
        
        
        Public Sub New()
            InitializeComponent()
            
            ' Sets up the initial objects in the CheckedListBox.
            Dim myFruit As String()
 =  {"Apples", "Oranges",
 "Tomato"}
            checkedListBox1.Items.AddRange(myFruit)
            
            ' Changes the selection mode from double-click to single
 click.
            checkedListBox1.CheckOnClick = True
        End Sub 'New
        
        
        Protected Overloads Overrides
 Sub Dispose(ByVal disposing As
 Boolean)
            If disposing Then
                If Not (components Is
 Nothing) Then
                    components.Dispose()
                End If
            End If
            MyBase.Dispose(disposing)
        End Sub
         
        Private Sub InitializeComponent()
            Me.components = New System.ComponentModel.Container()
            Me.textBox1 = New System.Windows.Forms.TextBox()
            Me.checkedListBox1 = New System.Windows.Forms.CheckedListBox()
            Me.listBox1 = New System.Windows.Forms.ListBox()
            Me.button1 = New System.Windows.Forms.Button()
            Me.button2 = New System.Windows.Forms.Button()
            Me.button3 = New System.Windows.Forms.Button()
            Me.textBox1.Location = New System.Drawing.Point(144,
 64)
            Me.textBox1.Size = New System.Drawing.Size(128,
 20)
            Me.textBox1.TabIndex = 1
            Me.checkedListBox1.Location = New
 System.Drawing.Point(16, 64)
            Me.checkedListBox1.Size = New System.Drawing.Size(120,
 184)
            Me.checkedListBox1.TabIndex = 0
            Me.listBox1.Location = New System.Drawing.Point(408,
 64)
            Me.listBox1.Size = New System.Drawing.Size(128,
 186)
            Me.listBox1.TabIndex = 3
            Me.button1.Enabled = False
            Me.button1.Location = New System.Drawing.Point(144,
 104)
            Me.button1.Size = New System.Drawing.Size(104,
 32)
            Me.button1.TabIndex = 2
            Me.button1.Text = "Add Fruit"
            Me.button2.Enabled = False
            Me.button2.Location = New System.Drawing.Point(288,
 64)
            Me.button2.Size = New System.Drawing.Size(104,
 32)
            Me.button2.TabIndex = 2
            Me.button2.Text = "Show Order"
            Me.button3.Enabled = False
            Me.button3.Location = New System.Drawing.Point(288,
 104)
            Me.button3.Size = New System.Drawing.Size(104,
 32)
            Me.button3.TabIndex = 2
            Me.button3.Text = "Save Order"
            Me.ClientSize = New System.Drawing.Size(563,
 273)
            Me.Controls.AddRange(New System.Windows.Forms.Control()
 {Me.listBox1, Me.button3, Me.button2, Me.button1,
 Me.textBox1, Me.checkedListBox1})
            Me.Text = "Fruit Order"
        End Sub 'InitializeComponent
        
        <STAThread()> _
        Public Shared Sub
 Main()
            Application.Run(New Form1())
        End Sub 'Main
        
        
        ' Adds the string if the text box has data in it.
        Private Sub button1_Click(sender As
 Object, _
                e As System.EventArgs) Handles
 button1.Click
            If textBox1.Text <> ""
 Then
                If checkedListBox1.CheckedItems.Contains(textBox1.Text)
 = False Then
                    checkedListBox1.Items.Add(textBox1.Text, CheckState.Checked)
                End If
                textBox1.Text = ""
            End If
        End Sub 'button1_Click
         
        ' Activates or deactivates the Add button.
        Private Sub textBox1_TextChanged(sender
 As Object, _
                e As System.EventArgs) Handles
 textBox1.TextChanged
            If textBox1.Text = ""
 Then
                button1.Enabled = False
            Else
                button1.Enabled = True
            End If
        End Sub 'textBox1_TextChanged
         
        
        ' Moves the checked items from the CheckedListBox to the listBox.
        Private Sub button2_Click(sender As
 Object, _
                e As System.EventArgs) Handles
 button2.Click
            listBox1.Items.Clear()
            button3.Enabled = False
            Dim i As Integer
            For i = 0 To checkedListBox1.CheckedItems.Count
 - 1
                listBox1.Items.Add(checkedListBox1.CheckedItems(i))
            Next i
            If listBox1.Items.Count > 0 Then
                button3.Enabled = True
            End If 
        End Sub 'button2_Click
        
        ' Activates the move button if there are checked items.
        Private Sub checkedListBox1_ItemCheck(sender
 As Object, _
                e As ItemCheckEventArgs) Handles
 checkedListBox1.ItemCheck
            If e.NewValue = CheckState.Unchecked Then
                If checkedListBox1.CheckedItems.Count = 1 Then
                    button2.Enabled = False
                End If
            Else
                button2.Enabled = True
            End If
        End Sub 'checkedListBox1_ItemCheck
        
        
        ' Saves the items to a file.
        Private Sub button3_Click(sender As
 Object, _
                e As System.EventArgs) Handles
 button3.Click
            ' Insert code to save a file.
            listBox1.Items.Clear()
            Dim myEnumerator As IEnumerator
            myEnumerator = checkedListBox1.CheckedIndices.GetEnumerator()
            Dim y As Integer
            While myEnumerator.MoveNext() <> False
                y = CInt(myEnumerator.Current)
                checkedListBox1.SetItemChecked(y, False)
            End While
            button3.Enabled = False
        End Sub 'button3_Click
    End Class 'Form1
End Namespace 'WindowsApplication1

namespace WindowsApplication1
{
   using System;
   using System.Drawing;
   using System.Collections;
   using System.ComponentModel;
   using System.Windows.Forms;
   using System.Data;
   using System.IO ;

   public class Form1 : System.Windows.Forms.Form
   {
      private System.Windows.Forms.CheckedListBox checkedListBox1;
      private System.Windows.Forms.TextBox textBox1;
      private System.Windows.Forms.Button button1;
      private System.Windows.Forms.Button button2;
      private System.Windows.Forms.ListBox listBox1;
      private System.Windows.Forms.Button button3;
        private System.ComponentModel.Container components;
      
      public Form1()
      {
            InitializeComponent();

         // Sets up the initial objects in the CheckedListBox.
            string[] myFruit = {"Apples", "Oranges"
,"Tomato"};
         checkedListBox1.Items.AddRange(myFruit);

            // Changes the selection mode from double-click to single
 click.
         checkedListBox1.CheckOnClick = true;
      }

      protected override void Dispose( bool
 disposing )
      {
        if( disposing )
        {
            if (components != null) 
            {
              components.Dispose();
            }
        }
        base.Dispose( disposing );
      }

      private void InitializeComponent()
      {
         this.components = new System.ComponentModel.Container();
         this.textBox1 = new System.Windows.Forms.TextBox();
         this.checkedListBox1 = new System.Windows.Forms.CheckedListBox();
         this.listBox1 = new System.Windows.Forms.ListBox();
         this.button1 = new System.Windows.Forms.Button();
         this.button2 = new System.Windows.Forms.Button();
         this.button3 = new System.Windows.Forms.Button();
         this.textBox1.Location = new System.Drawing.Point(144,
 64);
         this.textBox1.Size = new System.Drawing.Size(128,
 20);
         this.textBox1.TabIndex = 1;
         this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
         this.checkedListBox1.Location = new
 System.Drawing.Point(16, 64);
         this.checkedListBox1.Size = new System.Drawing.Size(120,
 184);
         this.checkedListBox1.TabIndex = 0;
         this.checkedListBox1.ItemCheck += new
 System.Windows.Forms.ItemCheckEventHandler(this.checkedListBox1_ItemCheck);
         this.listBox1.Location = new System.Drawing.Point(408,
 64);
         this.listBox1.Size = new System.Drawing.Size(128,
 186);
         this.listBox1.TabIndex = 3;
         this.button1.Enabled = false;
         this.button1.Location = new System.Drawing.Point(144,
 104);
         this.button1.Size = new System.Drawing.Size(104,
 32);
         this.button1.TabIndex = 2;
         this.button1.Text = "Add Fruit";
         this.button1.Click += new System.EventHandler(this.button1_Click);
         this.button2.Enabled = false;
         this.button2.Location = new System.Drawing.Point(288,
 64);
         this.button2.Size = new System.Drawing.Size(104,
 32);
         this.button2.TabIndex = 2;
         this.button2.Text = "Show Order";
         this.button2.Click += new System.EventHandler(this.button2_Click);
         this.button3.Enabled = false;
         this.button3.Location = new System.Drawing.Point(288,
 104);
         this.button3.Size = new System.Drawing.Size(104,
 32);
         this.button3.TabIndex = 2;
         this.button3.Text = "Save Order";
         this.button3.Click += new System.EventHandler(this.button3_Click);
         this.ClientSize = new System.Drawing.Size(563,
 273);
         this.Controls.AddRange(new System.Windows.Forms.Control[]
 {this.listBox1,
                                                        this.button3
,
                                                        this.button2
,
                                                        this.button1
,
                                                        this.textBox1
,
                                                        this.checkedListBox1});
         this.Text = "Fruit Order";
      }

      [STAThread]
      public static void
 Main(string[] args) 
      {
         Application.Run(new Form1());
      }

      // Adds the string if the text box has data in it.
      private void button1_Click(object sender,
 System.EventArgs e)
      {
         if(textBox1.Text != "")
         {
            if(checkedListBox1.CheckedItems.Contains(textBox1.Text)==
 false)
               checkedListBox1.Items.Add(textBox1.Text,CheckState.Checked);
            textBox1.Text = "";
         }

      }
      // Activates or deactivates the Add button.
      private void textBox1_TextChanged(object
 sender, System.EventArgs e)
      {
         if (textBox1.Text == "")
         {
            button1.Enabled = false;
         }
         else
         {
            button1.Enabled = true;
         }
            
        }

      // Moves the checked items from the CheckedListBox to the listBox.
      private void button2_Click(object sender,
 System.EventArgs e)
      {
         listBox1.Items.Clear();
         button3.Enabled=false;
         for (int i=0; i< checkedListBox1.CheckedItems.Count;i++)
         {
            listBox1.Items.Add(checkedListBox1.CheckedItems[i]);
         }
         if (listBox1.Items.Count>0)
            button3.Enabled=true;
         
      }
        // Activates the move button if there are checked items.
      private void checkedListBox1_ItemCheck(object
 sender, ItemCheckEventArgs e)
      {
         if(e.NewValue==CheckState.Unchecked)
         {
            if(checkedListBox1.CheckedItems.Count==1)
            {
               button2.Enabled = false;
            }
         }
         else
         {
            button2.Enabled = true;
         }
      }

        // Saves the items to a file.
      private void button3_Click(object sender,
 System.EventArgs e)
      {   
         // Insert code to save a file.
         listBox1.Items.Clear();
         IEnumerator myEnumerator;
         myEnumerator = checkedListBox1.CheckedIndices.GetEnumerator();
         int y;
         while (myEnumerator.MoveNext() != false)
         {
            y =(int) myEnumerator.Current;
            checkedListBox1.SetItemChecked(y, false);
         }
         button3.Enabled = false ;
      }        
    }
}

C++

#using <System.Data.dll>
#using <System.Windows.Forms.dll>
#using <System.dll>
#using <System.Drawing.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::IO;

public ref class Form1: public
 System::Windows::Forms::Form
{
private:
   System::Windows::Forms::CheckedListBox^ checkedListBox1;
   System::Windows::Forms::TextBox^ textBox1;
   System::Windows::Forms::Button^ button1;
   System::Windows::Forms::Button^ button2;
   System::Windows::Forms::ListBox^ listBox1;
   System::Windows::Forms::Button^ button3;
   System::ComponentModel::Container^ components;

public:
   Form1()
   {
      InitializeComponent();
      
      // Sets up the initial objects in the CheckedListBox.
      array<String^>^myFruit = {"Apples","Oranges","Tomato"};
      checkedListBox1->Items->AddRange( myFruit );
      
      // Changes the selection mode from double-click to single click.
      checkedListBox1->CheckOnClick = true;
   }

public:
   ~Form1()
   {
      if ( components != nullptr )
      {
         delete components;
      }
   }

private:
   void InitializeComponent()
   {
      this->components = gcnew System::ComponentModel::Container;
      this->textBox1 = gcnew System::Windows::Forms::TextBox;
      this->checkedListBox1 = gcnew System::Windows::Forms::CheckedListBox;
      this->listBox1 = gcnew System::Windows::Forms::ListBox;
      this->button1 = gcnew System::Windows::Forms::Button;
      this->button2 = gcnew System::Windows::Forms::Button;
      this->button3 = gcnew System::Windows::Forms::Button;
      this->textBox1->Location = System::Drawing::Point(
 144, 64 );
      this->textBox1->Size = System::Drawing::Size( 128,
 20 );
      this->textBox1->TabIndex = 1;
      this->textBox1->TextChanged += gcnew System::EventHandler(
 this, &Form1::textBox1_TextChanged );
      this->checkedListBox1->Location = System::Drawing::Point(
 16, 64 );
      this->checkedListBox1->Size = System::Drawing::Size(
 120, 184 );
      this->checkedListBox1->TabIndex = 0;
      this->checkedListBox1->ItemCheck += gcnew System::Windows::Forms::ItemCheckEventHandler(
 this, &Form1::checkedListBox1_ItemCheck );
      this->listBox1->Location = System::Drawing::Point(
 408, 64 );
      this->listBox1->Size = System::Drawing::Size( 128,
 186 );
      this->listBox1->TabIndex = 3;
      this->button1->Enabled = false;
      this->button1->Location = System::Drawing::Point(
 144, 104 );
      this->button1->Size = System::Drawing::Size( 104,
 32 );
      this->button1->TabIndex = 2;
      this->button1->Text = "Add Fruit";
      this->button1->Click += gcnew System::EventHandler(
 this, &Form1::button1_Click );
      this->button2->Enabled = false;
      this->button2->Location = System::Drawing::Point(
 288, 64 );
      this->button2->Size = System::Drawing::Size( 104,
 32 );
      this->button2->TabIndex = 2;
      this->button2->Text = "Show Order";
      this->button2->Click += gcnew System::EventHandler(
 this, &Form1::button2_Click );
      this->button3->Enabled = false;
      this->button3->Location = System::Drawing::Point(
 288, 104 );
      this->button3->Size = System::Drawing::Size( 104,
 32 );
      this->button3->TabIndex = 2;
      this->button3->Text = "Save Order";
      this->button3->Click += gcnew System::EventHandler(
 this, &Form1::button3_Click );
      this->ClientSize = System::Drawing::Size( 563, 273 );
      array<System::Windows::Forms::Control^>^temp0 = {this->listBox1
,this->button3,this->button2,this->button1
,this->textBox1,this->checkedListBox1};
      this->Controls->AddRange( temp0 );
      this->Text = "Fruit Order";
   }

   // Adds the string if the text box has data in it.
   void button1_Click( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      if (  !textBox1->Text->Equals( "" ) )
      {
         if ( checkedListBox1->CheckedItems->Contains( textBox1->Text
 ) == false )
                  checkedListBox1->Items->Add( textBox1->Text, CheckState::Checked
 );
         textBox1->Text = "";
      }
   }

   // Activates or deactivates the Add button.
   void textBox1_TextChanged( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      if ( textBox1->Text->Equals( "" ) )
      {
         button1->Enabled = false;
      }
      else
      {
         button1->Enabled = true;
      }
   }

   // Moves the checked items from the CheckedListBox to the listBox.
   void button2_Click( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      listBox1->Items->Clear();
      button3->Enabled = false;
      for ( int i = 0; i < checkedListBox1->CheckedItems->Count;
 i++ )
      {
         listBox1->Items->Add( checkedListBox1->CheckedItems[ i ] );

      }
      if ( listBox1->Items->Count > 0 )
            button3->Enabled = true;
   }

   // Activates the move button if there are checked items.
   void checkedListBox1_ItemCheck( Object^ /*sender*/, ItemCheckEventArgs^
 e )
   {
      if ( e->NewValue == CheckState::Unchecked )
      {
         if ( checkedListBox1->CheckedItems->Count == 1
 )
         {
            button2->Enabled = false;
         }
      }
      else
      {
         button2->Enabled = true;
      }
   }

   // Saves the items to a file.
   void button3_Click( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      // Insert code to save a file.
      listBox1->Items->Clear();
      IEnumerator^ myEnumerator;
      myEnumerator = checkedListBox1->CheckedIndices->GetEnumerator();
      int y;
      while ( myEnumerator->MoveNext() != false
 )
      {
         y = safe_cast<Int32>(myEnumerator->Current);
         checkedListBox1->SetItemChecked( y, false );
      }

      button3->Enabled = false;
   }
};

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

import System.*;
import System.Drawing.*;
import System.Collections.*;
import System.ComponentModel.*;
import System.Windows.Forms.*;
import System.Data.*;
import System.IO.*;
  
public class Form1 extends System.Windows.Forms.Form
{
    private System.Windows.Forms.CheckedListBox checkedListBox1;
    private System.Windows.Forms.TextBox textBox1;
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.Button button2;
    private System.Windows.Forms.ListBox listBox1;
    private System.Windows.Forms.Button button3;
    private System.ComponentModel.Container components;

    public Form1()
    {
        InitializeComponent();
        // Sets up the initial objects in the CheckedListBox.
        String myFruit[] =  { "Apples", "Oranges", "Tomato"
 };
        checkedListBox1.get_Items().AddRange(myFruit);
        // Changes the selection mode from double-click to single click.
        checkedListBox1.set_CheckOnClick(true);
    } //Form1

    protected void Dispose(boolean disposing)
    {
        if (disposing) {
            if (components != null) {
                components.Dispose();
            }
        }
        super.Dispose(disposing);
    } //Dispose

    private void InitializeComponent()
    {
        this.components = new System.ComponentModel.Container();
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.checkedListBox1 = new System.Windows.Forms.CheckedListBox();
        this.listBox1 = new System.Windows.Forms.ListBox();
        this.button1 = new System.Windows.Forms.Button();
        this.button2 = new System.Windows.Forms.Button();
        this.button3 = new System.Windows.Forms.Button();
        this.textBox1.set_Location(new System.Drawing.Point(144,
 64));
        this.textBox1.set_Size(new System.Drawing.Size(128,
 20));
        this.textBox1.set_TabIndex(1);
        this.textBox1.add_TextChanged(new System.EventHandler(
            this.textBox1_TextChanged));
        this.checkedListBox1.set_Location(new
 System.Drawing.Point(16, 64));
        this.checkedListBox1.set_Size(new System.Drawing.Size(120,
 184));
        this.checkedListBox1.set_TabIndex(0);
        this.checkedListBox1.add_ItemCheck(
            new System.Windows.Forms.ItemCheckEventHandler(
            this.checkedListBox1_ItemCheck));
        this.listBox1.set_Location(new System.Drawing.Point(408,
 64));
        this.listBox1.set_Size(new System.Drawing.Size(128,
 186));
        this.listBox1.set_TabIndex(3);
        this.button1.set_Enabled(false);
        this.button1.set_Location(new System.Drawing.Point(144,
 104));
        this.button1.set_Size(new System.Drawing.Size(104,
 32));
        this.button1.set_TabIndex(2);
        this.button1.set_Text("Add Fruit");
        this.button1.add_Click(new System.EventHandler(this.button1_Click));
        this.button2.set_Enabled(false);
        this.button2.set_Location(new System.Drawing.Point(288,
 64));
        this.button2.set_Size(new System.Drawing.Size(104,
 32));
        this.button2.set_TabIndex(2);
        this.button2.set_Text("Show Order");
        this.button2.add_Click(new System.EventHandler(this.button2_Click));
        this.button3.set_Enabled(false);
        this.button3.set_Location(new System.Drawing.Point(288,
 104));
        this.button3.set_Size(new System.Drawing.Size(104,
 32));
        this.button3.set_TabIndex(2);
        this.button3.set_Text("Save Order");
        this.button3.add_Click(new System.EventHandler(this.button3_Click));
        this.set_ClientSize(new System.Drawing.Size(563,
 273));
        this.get_Controls().AddRange(new System.Windows.Forms.Control[]
 { 
            this.listBox1, this.button3, this.button2,
 this.button1, 
            this.textBox1, this.checkedListBox1});
        this.set_Text("Fruit Order");
    } //InitializeComponent

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

    // Adds the string if the text box has data in it.
    private void button1_Click(Object sender,
 System.EventArgs e)
    {
        if (!textBox1.get_Text().Equals("")) {
            if (checkedListBox1.get_CheckedItems().Contains(textBox1.get_Text())
                == false) {
                checkedListBox1.get_Items().Add(textBox1.get_Text(), 
                    CheckState.Checked);
            }
            textBox1.set_Text("");
        }
    } //button1_Click

    // Activates or deactivates the Add button.
    private void textBox1_TextChanged(Object
 sender, System.EventArgs e)
    {
        if (textBox1.get_Text().Equals("")) {
            button1.set_Enabled(false);
        }
        else {
            button1.set_Enabled(true);
        }
    } //textBox1_TextChanged

    // Moves the checked items from the CheckedListBox to the listBox.
    private void button2_Click(Object sender,
 System.EventArgs e)
    {
        listBox1.get_Items().Clear();
        button3.set_Enabled(false);
        for (int i = 0; i < checkedListBox1.get_CheckedItems().get_Count();
 
            i++) {
            listBox1.get_Items().Add(
                checkedListBox1.get_CheckedItems().get_Item(i));
        }
        if (listBox1.get_Items().get_Count() > 0) {
            button3.set_Enabled(true);
        }
    } //button2_Click

    // Activates the move button if there are checked items.
    private void checkedListBox1_ItemCheck(Object
 sender, ItemCheckEventArgs e)
    {
        if (e.get_NewValue().Equals(CheckState.Unchecked)) {
            if (checkedListBox1.get_CheckedItems().get_Count()
 == 1) {
                button2.set_Enabled(false);
            }
        }
        else {
            button2.set_Enabled(true);
        }
    } //checkedListBox1_ItemCheck

    // Saves the items to a file.
    private void button3_Click(Object sender,
 System.EventArgs e)
    {
        // Insert code to save a file.
        listBox1.get_Items().Clear();
        IEnumerator myEnumerator;
        myEnumerator = checkedListBox1.get_CheckedIndices().GetEnumerator();
        int y;
        while ((myEnumerator.MoveNext() != false))
 {
            y = (int)(System.Convert.ToInt32(myEnumerator.get_Current()));
            checkedListBox1.SetItemChecked(y, false);
        }
        button3.set_Enabled(false);
    } //button3_Click
} //Form1

継承階層

System.Object
   System.MarshalByRefObject
     System.ComponentModel.Component
       System.Windows.Forms.Control
         System.Windows.Forms.ListControl
           System.Windows.Forms.ListBox
            System.Windows.Forms.CheckedListBox

スレッドセーフ

この型の public static (Visual Basic では Shared) メンバはすべて、スレッドセーフです。インスタンスメンバの場合は、スレッドセーフであるとは限りません。

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