ListBox, constructeur
.NET Framework 3.5
Mise à jour : novembre 2007
Initialise une nouvelle instance de la classe ListBox.
Assembly : System.Windows.Forms (dans System.Windows.Forms.dll)
L'exemple de code suivant illustre la création d'un contrôle ListBox qui affiche plusieurs éléments dans des colonnes et dans lequel plusieurs éléments peuvent être sélectionnés dans la liste. Le code de l'exemple ajoute 50 éléments à ListBox en utilisant la méthode Add de la classe ListBox.ObjectCollection puis sélectionne trois éléments dans la liste avec la méthode SetSelected. Le code affiche ensuite les valeurs de la collection ListBox.SelectedObjectCollection (par l'intermédiaire de la propriété SelectedItems) et de ListBox.SelectedIndexCollection (par l'intermédiaire de la propriété SelectedIndices). Cet exemple requiert que le code se trouve dans et soit appelé à partir de Form.
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 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.set_Size(new System.Drawing.Size(200,100));
listBox1.set_Location(new System.Drawing.Point(10,10));
// Add the ListBox to the form.
this.get_Controls().Add(listBox1);
// Set the ListBox to display items in multiple columns.
listBox1.set_MultiColumn(true);
// Set the selection mode to multiple and extended.
listBox1.set_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.get_Items().Add(("Item" + (new Integer(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.get_SelectedItems().get_Item(1).ToString());
// Display the index of the first selected item in the ListBox.
System.Diagnostics.Debug.WriteLine((new Integer
(listBox1.get_SelectedIndices().get_Item(0))).ToString());
} //button1_Click
private function button1_Click(sender : Object, e : System.EventArgs) { // Create an instance of the ListBox. var listBox1 : ListBox = 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 (var x : int = 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); @if(@DEBUG) // 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 }
Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professionnel Édition x64, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile pour Pocket PC
Le .NET Framework et le .NET Compact Framework ne prennent pas en charge toutes les versions de chaque plateforme. Pour obtenir la liste des versions prises en charge, consultez Configuration requise du .NET Framework.
