Control.RightToLeftChanged Control.RightToLeftChanged Control.RightToLeftChanged Control.RightToLeftChanged Event

定义

RightToLeft 属性值更改时发生。Occurs when the RightToLeft property value changes.

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

示例

下面的代码示例是一个在Text属性值更改时执行的事件处理程序。The following code example is an event handler that is executed when the Text property value changes. Changed 类具有多个方法,这些方法具有 name 模式 PropertyName,在相应的 PropertyName 值更改(PropertyName 表示相应属性的名称)时引发。 ControlThe 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).

下面的代码示例更改ForeColorTextBox显示货币数据的的。The following code example changes the ForeColor of a TextBox displaying currency data. 该示例将文本转换为十进制数字,如果ForeColor Color.Black数字为负Color.Red ,则将更改为,如果数字为正,则更改为。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. 此示例要求具有一个Form TextBox包含的。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 

注解

如果编程修改或用户交互RightToLeft更改了属性,则会引发此事件。This event is raised if the RightToLeft property is changed by either a programmatic modification or user interaction.

有关处理事件的详细信息, 请参阅处理和引发事件For more information about handling events, see Handling and Raising Events.

适用于

另请参阅