DataGridBoolColumn.AllowNullChanged Evento

Definizione

Spazio dei nomi:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Si verifica quando si modifica la proprietà AllowNull.

C#

public event EventHandler AllowNullChanged;

Tipo evento

EventHandler

Esempio

Nell'esempio di codice seguente viene illustrato l'uso di questo membro.

C#

private void RegisterEventHandlers(DataGridBoolColumn myDataGridBoolColumn)
{
   myDataGridBoolColumn.AllowNullChanged += 
      new System.EventHandler(myDataGridBoolColumn_AllowNullChanged);
   myDataGridBoolColumn.TrueValueChanged += 
      new System.EventHandler(myDataGridBoolColumn_TrueValueChanged);
   myDataGridBoolColumn.FalseValueChanged +=
      new System.EventHandler(myDataGridBoolColumn_FalseValueChanged);
}

// Event handler for event when 'TrueValue' is property changed.
private void myDataGridBoolColumn_TrueValueChanged(object sender, EventArgs e)
{
   MessageBox.Show("The TrueValue property of the DataGridBoolColumn has been changed to "
      + myDataGridBoolColumn.TrueValue);
}

// Event handler for event when 'FalseValue' is property changed.
private void myDataGridBoolColumn_FalseValueChanged(object sender, EventArgs e)
{
   MessageBox.Show("The FalseValue property of the DataGridBoolColumn has been changed to "
      + myDataGridBoolColumn.FalseValue);
}

// Event handler for event when 'AllowNull' is property changed.
private void myDataGridBoolColumn_AllowNullChanged(object sender, EventArgs e)
{
   MessageBox.Show("The AllowNull property of DataGridBoolColumn has been changed to "
      + myDataGridBoolColumn.AllowNull);
}

Si applica a