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

定义

Dock 属性的值更改时发生。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 

示例

下面的代码示例是一个事件处理程序时执行Text属性值发生更改。The following code example is an event handler that is executed when the Text property value changes. Control类的一些方法具有名称模式PropertyName Changed的时引发的相应PropertyName值发生更改 (PropertyName表示相应的属性的名称)。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).

下面的代码示例中更改ForeColorTextBox显示货币数据。The following code example changes the ForeColor of a TextBox displaying currency data. 此示例将文本转换为十进制数字,并更改ForeColorColor.Red如果数字为负数和Color.Black如果数字为正数。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 

注解

如果引发此事件Dock属性更改通过以编程方式修改或用户交互。This event is raised if the Dock 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