Control.KeyUp Événement
Définition
Important
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Se produit lorsqu'une touche est relâchée alors que le contrôle a le focus.
public:
event System::Windows::Forms::KeyEventHandler ^ KeyUp;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 Type d'événement
Exemples
L’exemple de code suivant utilise l’événement KeyUp avec la Help classe pour afficher l’aide de style contextuel à l’utilisateur.
// 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
L’exemple de code suivant montre l’ordre d’augmentation KeyDowndes événements et KeyUp , ainsi KeyPress que la façon d’inscrire des gestionnaires d’événements sur ceux-ci.
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
Les événements clés se produisent dans l’ordre suivant :
Pour gérer les événements de clavier uniquement au niveau du formulaire et ne pas permettre à d’autres contrôles de recevoir des événements de clavier, définissez la propriété dans la KeyPressEventArgs.Handled méthode de gestion des événements de KeyPress votre formulaire sur true. Certaines clés, telles que les touches TAB, RETURN, ÉCHAP et de direction, sont gérées automatiquement par les contrôles. Pour que ces clés déclenchent l’événement KeyUp , vous devez remplacer la IsInputKey méthode dans chaque contrôle de votre formulaire. Le code pour la substitution de IsInputKey doit déterminer si l’une des touches spéciales est enfoncée et retourner une valeur de true.
Pour plus d'informations sur la gestion des événements, voir gestion et déclenchement d’événements.
