ListBox.Items Properti

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Sumber:

ListBox.cs

Mendapatkan item dari ListBox.

public:
 property System::Windows::Forms::ListBox::ObjectCollection ^ Items { System::Windows::Forms::ListBox::ObjectCollection ^ get(); };

public System.Windows.Forms.ListBox.ObjectCollection Items { get; }

member this.Items : System.Windows.Forms.ListBox.ObjectCollection

Public ReadOnly Property Items As ListBox.ObjectCollection

Nilai Properti

ListBox.ObjectCollection

Mewakili ListBox.ObjectCollection item dalam ListBox.

Contoh

Contoh kode berikut menunjukkan cara membuat ListBox kontrol yang menampilkan beberapa item dalam kolom dan dapat memilih lebih dari satu item dalam daftar kontrol. Kode untuk contoh menambahkan 50 item ke ListBox menggunakan Add metode ListBox.ObjectCollection kelas lalu memilih tiga item dari daftar menggunakan SetSelected metode . Kode kemudian menampilkan nilai dari ListBox.SelectedObjectCollection koleksi (melalui SelectedItems properti) dan ListBox.SelectedIndexCollection (melalui SelectedIndices properti ). Contoh ini mengharuskan kode berada di dan dipanggil dari 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

Keterangan

Properti ini memungkinkan Anda untuk mendapatkan referensi ke daftar item yang saat ini disimpan di ListBox. Dengan referensi ini, Anda dapat menambahkan item, menghapus item, dan mendapatkan hitungan item dalam koleksi. Untuk informasi selengkapnya tentang tugas yang dapat dilakukan dengan kumpulan item, lihat ListBox.ObjectCollection topik referensi kelas.

Anda juga dapat memanipulasi item a ListBox dengan menggunakan DataSource properti . Jika Anda menggunakan DataSource properti untuk menambahkan item ke ListBox, Anda dapat melihat item dalam ListBox menggunakan Items properti tetapi Anda tidak dapat menambahkan atau menghapus item dari daftar menggunakan metode ListBox.ObjectCollection.

Lihat juga

• ListBox.ObjectCollection