Control.ForeColorChanged イベント

public:
 event EventHandler ^ ForeColorChanged;

public event EventHandler ForeColorChanged;

member this.ForeColorChanged : EventHandler 

Public Custom Event ForeColorChanged As EventHandler 

例

次のコード例は、Text プロパティ値が変更されたときに実行されるイベントハンドラーです。The following code example is an event handler that is executed when the Text property value changes. Control クラスには、対応するpropertyname値が変更されたときに発生する名前パターンPropertyNameChanged を持ついくつかのメソッドがあります (propertynameは対応するプロパティの名前を表します)。The Control class has several methods with the name pattern PropertyNameChanged that are raised when the corresponding PropertyName value changes (PropertyName represents the name of the corresponding property).

次のコード例では、通貨データを表示する TextBox の ForeColor を変更します。The following code example changes the ForeColor of a TextBox displaying currency data. この例では、テキストを10進数に変換し、数値が負の場合は ForeColor を Color.Red に変更します。数値が正の場合は Color.Black に変更します。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. この例では、TextBoxを含む Form が必要です。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 

注釈

このイベントは、ForeColor プロパティがプログラムによる変更または対話によって変更された場合に発生します。This event is raised if the ForeColor property is changed by either a programmatic modification or through interaction.

イベントの処理の詳細については、「処理とイベントの発生」を参照してください。For more information about handling events, see Handling and Raising Events.

適用対象

こちらもご覧ください

• OnForeColorChanged(EventArgs)
• ForeColor
• Color