Control.ProcessMnemonic(Char) Control.ProcessMnemonic(Char) Control.ProcessMnemonic(Char) Control.ProcessMnemonic(Char) Method

定义

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

protected public:
 virtual bool ProcessMnemonic(char charCode);
protected internal virtual bool ProcessMnemonic (char charCode);
abstract member ProcessMnemonic : char -> bool
override this.ProcessMnemonic : char -> bool
Protected Friend Overridable 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如何重写 button 类的扩展ProcessMnemonic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. 该示例还演示如何使用CanSelectIsMnemonic属性。The example also demonstrates the use of the CanSelect and IsMnemonic properties. 若要运行此示例中的窗体类,同一文件中后面粘贴以下代码。To run this example paste the following code after a form class, in the same file. 添加的按钮类型的MnemonicButton到窗体。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

调用此方法以便为控件提供机会处理助记键字符。This method is called to give a control the opportunity to process a mnemonic character. 该方法应确定是否在控件处于处理助记键的状态,是否给定的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. 如果通过因此,此方法应执行与助记键并返回关联的操作trueIf so, the method should perform the action associated with the mnemonic and return true. 如果不是,该方法应返回falseIf not, the method should return false. 此方法的实现通常使用IsMnemonic方法,以确定给定的字符是否匹配控件的文本中的助记键。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.  
       }  

此默认实现ProcessMnemonic方法仅返回false以指示该控件具有没有助记键。This default implementation of the ProcessMnemonic method simply returns false to indicate that the control has no mnemonic.

安全性

UIPermission
有关继承的类来调用此方法的所有窗口。for all windows for inheriting classes to call this method. 关联枚举:AllWindows的值UIPermissionWindowAssociated enumeration: AllWindows value of UIPermissionWindow.

适用于

另请参阅