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Control.OnDoubleClick (Método)

Provoca el evento DoubleClick.

Espacio de nombres: System.Windows.Forms
Ensamblado: System.Windows.Forms (en system.windows.forms.dll)

protected virtual void OnDoubleClick (
	EventArgs e
)
protected void OnDoubleClick (
	EventArgs e
)
protected function OnDoubleClick (
	e : EventArgs
)
No aplicable.

Parámetros

e

EventArgs que contiene los datos del evento.

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

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

En el ejemplo de código siguiente se utiliza el evento DoubleClick de un ListBox para cargar los archivos de texto mostrados en un ListBox en un control TextBox.

// This example uses the DoubleClick event of a ListBox to load text files
// listed in the ListBox into a TextBox control. This example
// assumes that the ListBox, named listBox1, contains a list of valid file
// names with path and that this event handler method
// is connected to the DoublClick event of a ListBox control named listBox1.
// This example requires code access permission to access files.
private void listBox1_DoubleClick(object sender, System.EventArgs e)
{
    // Get the name of the file to open from the ListBox.
    String file = listBox1.SelectedItem.ToString();

    try
    {
        // Determine if the file exists before loading.
        if (System.IO.File.Exists(file))
        {
            // Open the file and use a TextReader to read the contents into the TextBox.
            System.IO.FileInfo myFile = new System.IO.FileInfo(listBox1.SelectedItem.ToString());
            System.IO.TextReader myData = myFile.OpenText();;

            textBox1.Text = myData.ReadToEnd();
            myData.Close();
        }
    }
        // Exception is thrown by the OpenText method of the FileInfo class.
    catch(System.IO.FileNotFoundException)
    {
        MessageBox.Show("The file you specified does not exist.");
    }
        // Exception is thrown by the ReadToEnd method of the TextReader class.
    catch(System.IO.IOException)
    {
        MessageBox.Show("There was a problem loading the file into the TextBox. Ensure that the file is a valid text file.");
    }
}

// This example uses the DoubleClick event of a ListBox to load text files
// listed in the ListBox into a TextBox control. This example
// assumes that the ListBox, named listBox1, contains a list of valid file
// names with path and that this event handler method
// is connected to the DoublClick event of a ListBox control named listBox1.
// This example requires code access permission to access files.
private void listBox1_DoubleClick(Object sender, System.EventArgs e)
{
    // Get the name of the file to open from the ListBox.
    String file = listBox1.get_SelectedItem().ToString();
    try {
        // Determine if the file exists before loading.
        if (System.IO.File.Exists(file)) {
            // Open the file and use a TextReader to read the contents 
            // into the TextBox.
            System.IO.FileInfo myFile = new System.IO.FileInfo(listBox1.
                get_SelectedItem().ToString());
            System.IO.TextReader myData = myFile.OpenText();
            textBox1.set_Text(myData.ReadToEnd());
            myData.Close();
        }
    }
    // Exception is thrown by the OpenText method of the FileInfo class.
    catch (System.IO.FileNotFoundException exp) {
        MessageBox.Show("The file you specified does not exist.");
    }
    // Exception is thrown by the ReadToEnd method of the TextReader class.
    catch (System.IO.IOException exp) {
        MessageBox.Show("There was a problem loading the file into the "
            + "TextBox. Ensure that the file is a valid text file.");
    }
} //listBox1_DoubleClick

Windows 98, Windows 2000 Service Pack 4, Windows CE, Windows Millennium, Windows Mobile para Pocket PC, Windows Server 2003, Windows XP Media Center, Windows XP Professional x64, Windows XP SP2, Windows XP Starter

Microsoft .NET Framework 3.0 es compatible con Windows Vista, Microsoft Windows XP SP2 y Windows Server 2003 SP1.

.NET Framework

Compatible con: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Compatible con: 2.0
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