Control.TextChanged Evento

Definição

Ocorre quando o valor da propriedade Text muda.Occurs when the Text property value changes.

public:
 event EventHandler ^ TextChanged;
public event EventHandler TextChanged;
member this.TextChanged : EventHandler 
Public Custom Event TextChanged As EventHandler 

Exemplos

O exemplo de código a seguir altera a ForeColor de um TextBox exibir dados de moeda.The following code example changes the ForeColor of a TextBox displaying currency data. O exemplo converte o texto em um número decimal e altera o ForeColor para Color.Red se o número for negativo e Color.Black se o número for positivo.The example converts the text to a decimal number and changes the ForeColor to Color.Red if the number is negative and to Color.Black if the number is positive. Este exemplo requer que você tenha um Form que contenha um TextBox.This example requires that you have a Form that contains a TextBox.

private:
   void currencyTextBox_TextChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      try
      {
         // Convert the text to a Double and determine if it is a negative number.
         if ( Double::Parse( currencyTextBox->Text ) < 0 )
         {
            // If the number is negative, display it in Red.
            currencyTextBox->ForeColor = Color::Red;
         }
         else
         {
            // If the number is not negative, display it in Black.
            currencyTextBox->ForeColor = Color::Black;
         }
      }
      catch ( Exception^ ) 
      {
         // If there is an error, display the text using the system colors.
         currencyTextBox->ForeColor = SystemColors::ControlText;
      }
   }
private void currencyTextBox_TextChanged(object sender, EventArgs e)
{
   try
   {
      // Convert the text to a Double and determine if it is a negative number.
      if(double.Parse(currencyTextBox.Text) < 0)
      {
         // If the number is negative, display it in Red.
         currencyTextBox.ForeColor = Color.Red;
      }
      else
      {
         // If the number is not negative, display it in Black.
         currencyTextBox.ForeColor = Color.Black;
      }
   }
   catch
   {
      // If there is an error, display the text using the system colors.
      currencyTextBox.ForeColor = SystemColors.ControlText;
   }
}
Private Sub currencyTextBox_TextChanged(sender As Object, _ 
  e As EventArgs) Handles currencyTextBox.TextChanged
   Try
      ' Convert the text to a Double and determine if it is a negative number.
      If Double.Parse(currencyTextBox.Text) < 0 Then
         ' If the number is negative, display it in Red.
         currencyTextBox.ForeColor = Color.Red
      Else
         ' If the number is not negative, display it in Black.
         currencyTextBox.ForeColor = Color.Black
      End If
   Catch
      ' If there is an error, display the text using the system colors.
      currencyTextBox.ForeColor = SystemColors.ControlText
   End Try
End Sub 

Comentários

Este evento será acionado se a propriedade Text for alterada por uma modificação programática ou pela interação do usuário.This event is raised if the Text property is changed by either a programmatic modification or user interaction.

Para obter mais informações sobre como manipular eventos, consulte manipulando e gerando eventos.For more information about handling events, see Handling and Raising Events.

Aplica-se a

Veja também