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CheckedListBox-Klasse

  • Artikel

Zeigt eine ListBox an, in der auf der linken Seite jedes Elements ein Kontrollkästchen angezeigt wird.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

Syntax

'Declaration
<ComVisibleAttribute(True)> _
<ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)> _
Public Class CheckedListBox
    Inherits ListBox
'Usage
Dim instance As CheckedListBox

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

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

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

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

Hinweise

Dieses Steuerelement stellt eine Liste von Elementen dar, in der Benutzer mithilfe der Tastatur oder der Bildlaufleiste auf der rechten Seite des Steuerelements navigieren können. Wenn der Benutzer ein oder mehrere Elemente mit einem Häkchen markiert hat, kann mit CheckedListBox.CheckedItemCollection und CheckedListBox.CheckedIndexCollection zwischen den markierten Elementen navigiert werden.

Um der Liste zur Laufzeit Objekte hinzuzufügen, weisen Sie mithilfe der AddRange-Methode ein Array von Objektverweisen zu. In der Liste wird dann der Standard-Zeichenfolgenwert für jedes einzelne Objekt angezeigt. Mit der Add-Methode können Sie der Liste einzelne Elemente hinzufügen.

Das CheckedListBox-Objekt unterstützt über die CheckState-Enumeration drei Zustände: Checked, Indeterminate und Unchecked. Sie müssen den Zustand Indeterminate im Code festlegen, da die Benutzeroberfläche für CheckedListBox dafür kein Verfahren bereitstellt.

Wenn UseTabStops true ist, erkennt und erweitert das CheckedListBox Tabstoppzeichen im Text eines Elements, sodass Spalten erstellt werden. Die Tabstopps sind allerdings voreingestellt und können nicht geändert werden.

Die CheckedListBox-Klasse unterstützt die folgenden drei indizierten Auflistungen:

Auflistung

Kapselnde Klasse

Sämtliche im CheckedListBox-Steuerelement enthaltenen Elemente.

CheckedListBox.ObjectCollection

Markierte Elemente (einschließlich Elemente in unbestimmtem Zustand), die eine Teilmenge der im CheckedListBox-Steuerelemente enthaltenen Elemente bilden.

CheckedListBox.CheckedItemCollection

Markierte Indizes, die eine Teilmenge der Indizes in der Auflistung der Elemente bilden. Diese Indizes geben Elemente in aktiviertem oder unbestimmtem Zustand an.

CheckedListBox.CheckedIndexCollection

Die folgenden drei Tabellen sind Beispiele für die drei indizierten Auflistungen, die von der CheckedListBox-Klasse unterstützt werden.

Die erste Tabelle enthält ein Beispiel für die indizierte Auflistung von Elementen im Steuerelement (sämtliche im Steuerelement enthaltenen Elemente).

Index

Element

Aktivierungszustand

0

Objekt 1

Unchecked

1

Objekt 2

Checked

2

Objekt 3

Unchecked

3

Objekt 4

Indeterminate

4

Objekt 5

Checked

Die zweite Tabelle enthält ein Beispiel für die indizierte Auflistung der aktivierten Elemente.

Index

Element

0

Objekt 2

1

Objekt 4

2

Objekt 5

Die dritte Tabelle enthält ein Beispiel für die indizierte Auflistung von Indizes für aktivierte Elemente.

Index

Index von Element

0

1

1

3

2

4

Hinweis   Sie können keine Daten an eine CheckedListBox binden. Verwenden Sie stattdessen eine ComboBox oder eine ListBox. Weitere Informationen finden Sie unter Gewusst wie: Binden eines ComboBox-Steuerelements oder ListBox-Steuerelements in Windows Forms an Daten.

Beispiel

Im folgenden Beispiel wird die Verwendung der Methoden, Eigenschaften und Auflistungen von CheckedListBox veranschaulicht. Dies ist ein vollständiges Beispiel, das Sie in Ihr Projekt kopieren und ausführen können. Sie können Elemente aktivieren und deaktivieren, mit dem Textfeld Elemente hinzufügen und, wenn Sie auf die Schaltfläche zum Speichern geklickt haben, die aktivierten Elemente entfernen.

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 ;
      }        
    }
}
   

#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

Vererbungshierarchie

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

Threadsicherheit

Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.

Plattformen

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

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

CheckedListBox-Member
System.Windows.Forms-Namespace
ListBox

Weitere Ressourcen

CheckedListBox-Steuerelement (Windows Forms)