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Control.OnControlRemoved (Método)

Actualización: noviembre 2007

Provoca el evento ControlRemoved.

Espacio de nombres:  System.Windows.Forms
Ensamblado:  System.Windows.Forms (en System.Windows.Forms.dll)
protected virtual void OnControlRemoved(
	ControlEventArgs e
)
protected void OnControlRemoved(
	ControlEventArgs e
)
protected function OnControlRemoved(
	e : ControlEventArgs
)

Parámetros

e
Tipo: System.Windows.Forms.ControlEventArgs
ControlEventArgs que contiene los datos del evento.

Se llama a este método cuando se quita un control secundario del control.

Cuando se provoca un evento, se invoca al controlador del evento por medio de un delegado. Para obtener más información, vea Provocar un evento.

El método OnControlRemoved también permite que las clases derivadas controlen el evento sin asociar un delegado. Ésta es la técnica preferida para controlar el evento en una clase derivada.

Notas para los herederos:

Al reemplazar OnControlRemoved en una clase derivada, asegúrese de llamar al método OnControlRemoved de la clase base para que los delegados registrados reciban el evento.

En el ejemplo de código siguiente se utiliza ControlRemoved para quitar un control de un formulario y se muestra el nombre del control quitado en un MessageBox.

// 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);
        }
    }
}


// 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.add_ControlRemoved(new System.Windows.Forms.
        ControlEventHandler(this.Control_Removed));
    this.add_ControlAdded(new System.Windows.Forms.
        ControlEventHandler(this.Control_Added));
} //Form1_Load

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

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

// 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.set_Size(new Size(100, 10));
    textBox1.set_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.set_Name("textBox1");

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

// 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.
    for (int iCtr = 0; iCtr < this.get_Controls().get_Count(); iCtr++) {
        Control tempCtrl = this.get_Controls().get_Item(iCtr);

        // Determine whether the control is textBox1,
        // and if it is, remove it.
        if (tempCtrl.get_Name().Equals("textBox1")) {
            this.get_Controls().Remove(tempCtrl);
        }
    }
} //removeControl_Click


Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

.NET Framework y .NET Compact Framework no admiten todas las versiones de cada plataforma. Para obtener una lista de las versiones compatibles, vea Requisitos de sistema de .NET Framework.

.NET Framework

Compatible con: 3.5, 3.0, 2.0, 1.1, 1.0
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