Control.DockChanged Control.DockChanged Control.DockChanged Control.DockChanged Event

定義

發生於 Dock 屬性的值變更時。Occurs when the value of the Dock property changes.

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

範例

下列程式碼範例會為事件處理常式時執行Text屬性值變更。The following code example is an event handler that is executed when the Text property value changes. Control類別有數個方法名稱模式PropertyName Changed所引發的時機對應PropertyName值變更 (PropertyName代表對應的屬性名稱)。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).

下列程式碼範例會變更ForeColorTextBox顯示貨幣資料。The following code example changes the ForeColor of a TextBox displaying currency data. 此範例會將文字轉換成十進位數字和變更ForeColorColor.Red如果數字為負數,Color.Black如果數字為正數。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. 此範例中,您需要Form,其中包含TextBoxThis 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 

備註

如果會引發這個事件Dock屬性會變更以程式設計方式修改或使用者互動。This event is raised if the Dock property is changed by either a programmatic modification or user interaction.

如需有關如何處理事件的詳細資訊,請參閱 < 處理和引發事件For more information about handling events, see Handling and Raising Events.

適用於

另請參閱