Control.DoubleClick Evento

public:
 event EventHandler ^ DoubleClick;

public event EventHandler DoubleClick;

member this.DoubleClick : EventHandler 

Public Custom Event DoubleClick As EventHandler 

Tipo de evento

Ejemplos

En el ejemplo de código siguiente se usa el DoubleClick evento de para ListBox cargar archivos de texto enumerados en un ListBoxTextBox control .

   // 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 = gcnew 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.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 Sub listBox1_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles listBox1.DoubleClick
    ' Get the name of the file to open from the ListBox.
    Dim file As [String] = listBox1.SelectedItem.ToString()

    Try
        ' Determine if the file exists before loading.
        If System.IO.File.Exists(file) Then
            ' Open the file and use a TextReader to read the contents into the TextBox.
            Dim myFile As New System.IO.FileInfo(listBox1.SelectedItem.ToString())
            Dim myData As System.IO.TextReader = myFile.OpenText()

            textBox1.Text = myData.ReadToEnd()
            myData.Close()
        End If
        ' Exception is thrown by the OpenText method of the FileInfo class.
    Catch
        MessageBox.Show("The file you specified does not exist.")
        ' Exception is thrown by the ReadToEnd method of the TextReader class.
    Catch
     MessageBox.Show("There was a problem loading the file into the TextBox. Ensure that the file is a valid text file.")
    End Try
End Sub

Comentarios

Un doble clic viene determinado por la configuración del mouse del sistema operativo del usuario. El usuario puede establecer el tiempo entre clics de un botón del mouse que se debe considerar un doble clic en lugar de dos clics. El Click evento se genera cada vez que se hace doble clic en un control. Por ejemplo, si tiene controladores de eventos para los Click eventos y DoubleClick de , Formlos Click eventos y DoubleClick se generan cuando se hace doble clic en el formulario y se llama a ambos métodos. Si se hace doble clic en un control y ese control no admite el DoubleClick evento, es posible que el Click evento se genere dos veces.

Debe establecer los StandardDoubleClick valores y StandardClick de ControlStylestrue en para que se genere este evento. Es posible que estos valores ya estén establecidos en true si hereda de los controles de Windows Forms existentes.

Para obtener más información sobre el manejo de eventos, consulte controlar y provocar eventos.

Notas a los desarrolladores de herederos

Heredar de un control Windows Forms estándar y cambiar el StandardClick o StandardDoubleClick valores de ControlStyles a true puede provocar un comportamiento inesperado o no tener ningún efecto si el control no admite los eventos Click o DoubleClick.

En la tabla siguiente se enumeran los controles Windows Forms y qué evento (Click o DoubleClick) se genera en respuesta a la acción del mouse especificada.

* El puntero del mouse debe estar sobre un objeto secundario (TreeNode o ListViewItem).

** El TabControl debe tener al menos uno TabPage en su TabPages colección.

Consulte también

• OnDoubleClick(EventArgs)
• StandardClick
• StandardDoubleClick
• Click
• MouseClick
• MouseDoubleClick