ListBox.Items Property

定義

ListBox の項目を取得します。 Gets the items of the ListBox.

public System.Windows.Forms.ListBox.ObjectCollection Items { get; }
プロパティ値

ListBox.ObjectCollection 内の項目を表す ListBox An ListBox.ObjectCollection representing the items in the ListBox.

次のコード例は、作成する方法を示します、ListBoxコントロールの列に複数の項目を表示し、コントロールのリストで選択した 1 つ以上の項目を持つことができます。The following code example demonstrates how to create a ListBox control that displays multiple items in columns and can have more than one item selected in the control's list. 例のコードに 50 個の項目の追加、ListBoxを使用して、Addのメソッド、ListBox.ObjectCollectionを使用して、一覧から項目を 3 つのクラスと、選択、SetSelectedメソッド。The code for the example adds 50 items to the ListBox using the Add method of the ListBox.ObjectCollection class and then selects three items from the list using the SetSelected method. コードからの値を表示、ListBox.SelectedObjectCollectionコレクション (を通じて、SelectedItemsプロパティ) およびListBox.SelectedIndexCollection(を通じて、SelectedIndicesプロパティ)。The code then displays values from the ListBox.SelectedObjectCollection collection (through the SelectedItems property) and the ListBox.SelectedIndexCollection (through the SelectedIndices property). この例は、コードが記載されから呼び出すことが必要です、Formします。This example requires that the code is located in and called from a Form.

void button1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
   
   // Create an instance of the ListBox.
   ListBox^ listBox1 = gcnew ListBox;
   
   // Set the size and location of the ListBox.
   listBox1->Size = System::Drawing::Size( 200, 100 );
   listBox1->Location = System::Drawing::Point( 10, 10 );
   
   // Add the ListBox to the form.
   this->Controls->Add( listBox1 );
   
   // Set the ListBox to display items in multiple columns.
   listBox1->MultiColumn = true;
   
   // Set the selection mode to multiple and extended.
   listBox1->SelectionMode = SelectionMode::MultiExtended;
   
   // Shutdown the painting of the ListBox as items are added.
   listBox1->BeginUpdate();
   
   // Loop through and add 50 items to the ListBox.
   for ( int x = 1; x <= 50; x++ )
   {
      listBox1->Items->Add( String::Format( "Item {0}", x ) );

   }
   listBox1->EndUpdate();
   
   // Select three items from the ListBox.
   listBox1->SetSelected( 1, true );
   listBox1->SetSelected( 3, true );
   listBox1->SetSelected( 5, true );
   
   #if defined(DEBUG)
   // Display the second selected item in the ListBox to the console.
   System::Diagnostics::Debug::WriteLine( listBox1->SelectedItems[ 1 ] );
   
   // Display the index of the first selected item in the ListBox.
   System::Diagnostics::Debug::WriteLine( listBox1->SelectedIndices[ 0 ] );
   #endif
}

private void button1_Click(object sender, System.EventArgs e)
{
   // Create an instance of the ListBox.
   ListBox listBox1 = new ListBox();
   // Set the size and location of the ListBox.
   listBox1.Size = new System.Drawing.Size(200, 100);
   listBox1.Location = new System.Drawing.Point(10,10);
   // Add the ListBox to the form.
   this.Controls.Add(listBox1);
   // Set the ListBox to display items in multiple columns.
   listBox1.MultiColumn = true;
   // Set the selection mode to multiple and extended.
   listBox1.SelectionMode = SelectionMode.MultiExtended;
 
   // Shutdown the painting of the ListBox as items are added.
   listBox1.BeginUpdate();
   // Loop through and add 50 items to the ListBox.
   for (int x = 1; x <= 50; x++)
   {
      listBox1.Items.Add("Item " + x.ToString());
   }
   // Allow the ListBox to repaint and display the new items.
   listBox1.EndUpdate();
      
   // Select three items from the ListBox.
   listBox1.SetSelected(1, true);
   listBox1.SetSelected(3, true);
   listBox1.SetSelected(5, true);

   // Display the second selected item in the ListBox to the console.
   System.Diagnostics.Debug.WriteLine(listBox1.SelectedItems[1].ToString());
   // Display the index of the first selected item in the ListBox.
   System.Diagnostics.Debug.WriteLine(listBox1.SelectedIndices[0].ToString());             
}

Private Sub button1_Click(sender As Object, e As System.EventArgs)
    ' Create an instance of the ListBox.
    Dim listBox1 As New ListBox()
    ' Set the size and location of the ListBox.
    listBox1.Size = New System.Drawing.Size(200, 100)
    listBox1.Location = New System.Drawing.Point(10, 10)
    ' Add the ListBox to the form.
    Me.Controls.Add(listBox1)
    ' Set the ListBox to display items in multiple columns.
    listBox1.MultiColumn = True
    ' Set the selection mode to multiple and extended.
    listBox1.SelectionMode = SelectionMode.MultiExtended
    
    ' Shutdown the painting of the ListBox as items are added.
    listBox1.BeginUpdate()
    ' Loop through and add 50 items to the ListBox.
    Dim x As Integer
    For x = 1 To 50
        listBox1.Items.Add("Item " & x.ToString())
    Next x
    ' Allow the ListBox to repaint and display the new items.
    listBox1.EndUpdate()
    
    ' Select three items from the ListBox.
    listBox1.SetSelected(1, True)
    listBox1.SetSelected(3, True)
    listBox1.SetSelected(5, True)
       
    ' Display the second selected item in the ListBox to the console.
    System.Diagnostics.Debug.WriteLine(listBox1.SelectedItems(1).ToString())
    ' Display the index of the first selected item in the ListBox.
    System.Diagnostics.Debug.WriteLine(listBox1.SelectedIndices(0).ToString())
End Sub

注釈

このプロパティに格納されている項目の一覧への参照を取得することができます、ListBoxします。This property enables you to obtain a reference to the list of items that are currently stored in the ListBox. この参照を持つには、項目を追加し、アイテムを削除およびコレクション内の項目の数を取得することができます。With this reference, you can add items, remove items, and obtain a count of the items in the collection. 項目のコレクションで実行できるタスクの詳細については、次を参照してください。、ListBox.ObjectCollectionクラスのリファレンス トピック。For more information about the tasks that can be performed with the item collection, see the ListBox.ObjectCollection class reference topics.

項目を操作することも、ListBoxを使用して、DataSourceプロパティ。You can also manipulate the items of a ListBox by using the DataSource property. 使用する場合、DataSourceプロパティに項目を追加、 ListBox、内の項目を表示することができます、ListBoxを使用して、Itemsプロパティが追加または削除できない項目のメソッドを使用してリストから、ListBox.ObjectCollectionします。If you use the DataSource property to add items to a ListBox, you can view the items in the ListBox using the Items property but you cannot add or remove items from the list using the methods of the ListBox.ObjectCollection.

適用対象

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