Control.KeyUp Control.KeyUp Control.KeyUp Control.KeyUp Event

Définition

Se produit lorsqu'une touche est relâchée alors que le contrôle a le focus.Occurs when a key is released while the control has focus.

public:
 event System::Windows::Forms::KeyEventHandler ^ KeyUp;
public event System.Windows.Forms.KeyEventHandler KeyUp;
member this.KeyUp : System.Windows.Forms.KeyEventHandler 
Public Custom Event KeyUp As KeyEventHandler 

Exemples

Le code suivant exemple utilise le KeyUp événement avec le Help classe pour afficher l’aide de style contextuel à l’utilisateur.The following code example uses the KeyUp event with the Help class to display pop-up style help to the user.

   // This example demonstrates how to use the KeyUp event with the Help class to display
   // pop-up style help to the user of the application. When the user presses F1, the Help
   // class displays a pop-up window, similar to a ToolTip, near the control. This example assumes
   // that a TextBox control, named textBox1, has been added to the form and its KeyUp
   // event has been connected to this event handler method.
private:
   void textBox1_KeyUp( Object^ /*sender*/, System::Windows::Forms::KeyEventArgs^ e )
   {
      
      // Determine whether the key entered is the F1 key. Display help if it is.
      if ( e->KeyCode == Keys::F1 )
      {
         
         // Display a pop-up help topic to assist the user.
         Help::ShowPopup( textBox1, "Enter your first name", Point(textBox1->Right,this->textBox1->Bottom) );
      }
   }
// This example demonstrates how to use the KeyUp event with the Help class to display
// pop-up style help to the user of the application. When the user presses F1, the Help
// class displays a pop-up window, similar to a ToolTip, near the control. This example assumes
// that a TextBox control, named textBox1, has been added to the form and its KeyUp
// event has been contected to this event handler method.
private void textBox1_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e)
{
    // Determine whether the key entered is the F1 key. Display help if it is.
    if(e.KeyCode == Keys.F1)
    {
        // Display a pop-up help topic to assist the user.
        Help.ShowPopup(textBox1, "Enter your first name", new Point(textBox1.Right, this.textBox1.Bottom));
    }
}
' This example demonstrates how to use the KeyUp event with the Help class to display
' pop-up style help to the user of the application. When the user presses F1, the Help
' class displays a pop-up window, similar to a ToolTip, near the control. This example assumes
' that a TextBox control, named textBox1, has been added to the form and its KeyUp
' event has been contected to this event handler method.
Private Sub textBox1_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles textBox1.KeyUp
    ' Determine whether the key entered is the F1 key. Display help if it is.
    If e.KeyCode = Keys.F1 Then
        ' Display a pop-up help topic to assist the user.
        Help.ShowPopup(textBox1, "Enter your first name", New Point(textBox1.Right, Me.textBox1.Bottom))
    End If
End Sub 'textBox1_KeyUp

L’exemple de code suivant montre l’ordre des ascendants du KeyDown, KeyUp et KeyPress événements, également comment inscrire des gestionnaires d’événements sur ces derniers.The following code example demonstrates the order of rising the KeyDown, KeyUp and KeyPress events, also how to register event handlers on them.

public partial class Form2 : Form
{
	public Form2()
	{
		InitializeComponent();
		textBox2.Multiline = true;
		textBox2.ScrollBars = ScrollBars.Both;

		//Setup events that listens on keypress
		textBox1.KeyDown += TextBox1_KeyDown;
		textBox1.KeyPress += TextBox1_KeyPress;
		textBox1.KeyUp += TextBox1_KeyUp;
	}

	// Handle the KeyUp event to print the type of character entered into the control.
	private void TextBox1_KeyUp(object sender, KeyEventArgs e)
	{
		textBox2.AppendText( $"KeyUp code: {e.KeyCode}, value: {e.KeyValue}, modifiers: {e.Modifiers}" + "\r\n");
	}

	// Handle the KeyPress event to print the type of character entered into the control.
	private void TextBox1_KeyPress(object sender, KeyPressEventArgs e)
	{
		textBox2.AppendText( $"KeyPress keychar: {e.KeyChar}" + "\r\n");
	}

	// Handle the KeyDown event to print the type of character entered into the control.
	private void TextBox1_KeyDown(object sender, KeyEventArgs e)
	{
		textBox2.AppendText( $"KeyDown code: {e.KeyCode}, value: {e.KeyValue}, modifiers: {e.Modifiers}" + "\r\n");
	}
}
Public Class Form2

    ' Handle the KeyDown event to print the type of character entered into the control.
    Private Sub TextBox1_KeyDown(sender As Object, e As KeyEventArgs) Handles TextBox1.KeyDown
        TextBox2.AppendText($"KeyDown code: {e.KeyCode}, value: {e.KeyValue}, modifiers: {e.Modifiers}" + vbCrLf)
    End Sub

    ' Handle the KeyPress event to print the type of character entered into the control.
    Private Sub TextBox1_KeyPress(sender As Object, e As KeyPressEventArgs) Handles TextBox1.KeyPress
        TextBox2.AppendText($"KeyPress keychar: {e.KeyChar}" + vbCrLf)
    End Sub

    ' Handle the KeyUp event to print the type of character entered into the control.
    Private Sub TextBox1_KeyUp(sender As Object, e As KeyEventArgs) Handles TextBox1.KeyUp
        TextBox2.AppendText($"KeyUp code: {e.KeyCode}, value: {e.KeyValue}, modifiers: {e.Modifiers}" + vbCrLf)
    End Sub

End Class

Remarques

Principaux événements se produisent dans l’ordre suivant :Key events occur in the following order:

  1. KeyDown

  2. KeyPress

  3. KeyUp

Pour gérer les événements de clavier uniquement au niveau du formulaire et pas autoriser d’autres contrôles recevoir des événements de clavier, définissez le KeyPressEventArgs.Handled propriété dans votre formulaire KeyPress méthode de gestion d’événements à true.To handle keyboard events only at the form level and not enable other controls to receive keyboard events, set the KeyPressEventArgs.Handled property in your form's KeyPress event-handling method to true. Certaines clés, telles que les touches de tabulation, retour, ÉCHAP et flèche sont gérées automatiquement par les contrôles.Certain keys, such as the TAB, RETURN, ESC, and arrow keys are handled by controls automatically. Pour que ces touches déclenchent le KeyUp événement, vous devez substituer la IsInputKey méthode dans chaque contrôle sur votre formulaire.To have these keys raise the KeyUp event, you must override the IsInputKey method in each control on your form. Le code pour le remplacement de IsInputKey doit déterminer si une des touches spéciales est enfoncée et retourner une valeur de true.The code for the override of IsInputKey would need to determine if one of the special keys is pressed and return a value of true.

Pour plus d'informations sur la gestion des événements, voir gestion et déclenchement d’événements.For more information about handling events, see Handling and Raising Events.

S’applique à

Voir aussi