ToolStripDropDown.ProcessMnemonic(Char) ToolStripDropDown.ProcessMnemonic(Char) ToolStripDropDown.ProcessMnemonic(Char) ToolStripDropDown.ProcessMnemonic(Char) Method

定义

处理助记键字符。Processes a mnemonic character.

protected public:
 override bool ProcessMnemonic(char charCode);
protected internal override bool ProcessMnemonic (char charCode);
override this.ProcessMnemonic : char -> bool
Protected Friend Overrides Function ProcessMnemonic (charCode As Char) As Boolean

参数

charCode
Char Char Char Char

要处理的字符。The character to process.

返回

如果字符由控件作为助记键处理,则为 true;否则为 falsetrue if the character was processed as a mnemonic by the control; otherwise, false.

示例

下面的代码示例演示了一个 button 类的扩展,该扩展ProcessMnemonic会重写方法以显示自定义行为。The following code example demonstrates an extension of the button class that overrides the ProcessMnemonic method to exhibit custom behavior. 该示例还演示了CanSelectIsMnemonic属性的用法。The example also demonstrates the use of the CanSelect and IsMnemonic properties. 若要运行此示例,请将以下代码粘贴到同一文件中的某个窗体类之后。To run this example, paste the following code after a form class, in the same file. 向窗体添加类型MnemonicButton的按钮。Add a button of type MnemonicButton to the form.

// This button is a simple extension of the button class that overrides
// the ProcessMnemonic method.  If the mnemonic is correctly entered,  
// the message box will appear and the click event will be raised.  
// This method makes sure the control is selectable and the 
// mnemonic is correct before displaying the message box
// and triggering the click event.
public ref class MyMnemonicButton: public Button
{
protected:
   bool ProcessMnemonic( char inputChar )
   {
      if ( CanSelect && IsMnemonic( inputChar, this->Text ) )
      {
         MessageBox::Show( "You've raised the click event "
         "using the mnemonic." );
         this->PerformClick();
         return true;
      }

      return false;
   }

};


// This button is a simple extension of the button class that overrides
// the ProcessMnemonic method.  If the mnemonic is correctly entered,  
// the message box will appear and the click event will be raised.  
public class MyMnemonicButton:Button

	// This method makes sure the control is selectable and the 
	// mneumonic is correct before displaying the message box
	// and triggering the click event.
{
	[UIPermission(
        SecurityAction.Demand, Window = UIPermissionWindow.AllWindows)]
        protected override bool ProcessMnemonic(char inputChar)
	{

		if (CanSelect&&IsMnemonic(inputChar, this.Text))
		{
			MessageBox.Show("You've raised the click event " +
				"using the mnemonic.");
			this.PerformClick();
			return true;
		}
		return false;
	}

}
' This button is a simple extension of the button class that overrides
' the ProcessMnemonic method.  If the mnemonic is correctly entered,  
' the message box will appear and the click event will be raised.  
Public Class MyMnemonicButton
    Inherits Button

    ' This method makes sure the control is selectable and the 
    ' mneumonic is correct before displaying the message box
    ' and triggering the click event.
    <System.Security.Permissions.UIPermission( _
    System.Security.Permissions.SecurityAction.Demand, Window:=UIPermissionWindow.AllWindows)> _
    Protected Overrides Function ProcessMnemonic( _
        ByVal inputChar As Char) As Boolean

        If (CanSelect And IsMnemonic(inputChar, Me.Text)) Then
            MessageBox.Show("You've raised the click event " _
                & "using the mnemonic.")
            Me.PerformClick()
            Return True
        End If
        Return False
    End Function

End Class

注解

调用此方法是为了使控件有机会处理助记键字符。This method is called to give a control the opportunity to process a mnemonic character. 方法应确定控件是否处于用于处理助记键的状态,以及给定字符是否表示助记键。The method should determine whether the control is in a state to process mnemonics and if whether the given character represents a mnemonic. 如果是这样,则该方法应执行与助记键关联的操作true,并返回。If so, the method should perform the action associated with the mnemonic and return true. 如果不是,则该方法false应返回。If not, the method should return false. 此方法的实现通常使用IsMnemonic方法来确定给定字符是否与控件文本中的助记键匹配。Implementations of this method often use the IsMnemonic method to determine whether the given character matches a mnemonic in the control's text.

例如:For example:

if (CanSelect && IsMnemonic(charCode, MyControl.Text) {  
      // Perform action associated with mnemonic.  
       }  

ProcessMnemonic方法的默认实现只是返回false以指示该控件没有助记键。This default implementation of the ProcessMnemonic method simply returns false to indicate that the control has no mnemonic.

安全性

UIPermission
用于继承类的所有窗口以调用此方法。for all windows for inheriting classes to call this method. 关联的AllWindows UIPermissionWindow枚举: 值。Associated enumeration: AllWindows value of UIPermissionWindow.

适用于

另请参阅