ControlEventArgs Classe

Définition

Espace de noms:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Source:

ControlEventArgs.cs

Fournit des données pour les événements ControlAdded et ControlRemoved.

C#

public class ControlEventArgs : EventArgs

Héritage

Object

EventArgs

ControlEventArgs

Exemples

L’exemple de code suivant illustre l’utilisation des ControlAdded événements et ControlRemoved . L’exemple nécessite que deux Button contrôles soient ajoutés au formulaire et connectés aux addControl_Click méthodes de gestion des événements et removeControl_Click .

C#

// This example demonstrates the use of the ControlAdded and
// ControlRemoved events. This example assumes that two Button controls
// are added to the form and connected to the addControl_Click and
// removeControl_Click event-handler methods.
private void Form1_Load(object sender, System.EventArgs e)
{
    // Connect the ControlRemoved and ControlAdded event handlers
    // to the event-handler methods.
    // ControlRemoved and ControlAdded are not available at design time.
    this.ControlRemoved += new System.Windows.Forms.ControlEventHandler(this.Control_Removed);
    this.ControlAdded += new System.Windows.Forms.ControlEventHandler(this.Control_Added);
}

private void Control_Added(object sender, System.Windows.Forms.ControlEventArgs e)
{
    MessageBox.Show("The control named " + e.Control.Name + " has been added to the form.");
}

private void Control_Removed(object sender, System.Windows.Forms.ControlEventArgs e)
{
    MessageBox.Show("The control named " + e.Control.Name + " has been removed from the form.");
}

// Click event handler for a Button control. Adds a TextBox to the form.
private void addControl_Click(object sender, System.EventArgs e)
{
    // Create a new TextBox control and add it to the form.
    TextBox textBox1 = new TextBox();
    textBox1.Size = new Size(100,10);
    textBox1.Location = new Point(10,10);
    // Name the control in order to remove it later. The name must be specified
    // if a control is added at run time.
    textBox1.Name = "textBox1";

    // Add the control to the form's control collection.
    this.Controls.Add(textBox1);
}

// Click event handler for a Button control.
// Removes the previously added TextBox from the form.
private void removeControl_Click(object sender, System.EventArgs e)
{
    // Loop through all controls in the form's control collection.
    foreach (Control tempCtrl in this.Controls)
    {
        // Determine whether the control is textBox1,
        // and if it is, remove it.
        if (tempCtrl.Name == "textBox1")
        {
            this.Controls.Remove(tempCtrl);
        }
    }
}

Remarques

Pour plus d'informations sur la gestion des événements, voir gestion et déclenchement d’événements.

Constructeurs

ControlEventArgs(Control)

Initialise une nouvelle instance de la classe ControlEventArgs pour le contrôle spécifié.

Propriétés

Control

Obtient l'objet contrôle utilisé par cet événement.

S’applique à

Voir aussi

• ControlEventHandler
• ControlAdded
• ControlRemoved