CheckBox.ProcessMnemonic(Char) 方法

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

处理助记键字符。

protected:
 override bool ProcessMnemonic(char charCode);

protected public:
 override bool ProcessMnemonic(char charCode);

protected override bool ProcessMnemonic (char charCode);

protected internal override bool ProcessMnemonic (char charCode);

override this.ProcessMnemonic : char -> bool

Protected Overrides Function ProcessMnemonic (charCode As Char) As Boolean

Protected Friend Overrides Function ProcessMnemonic (charCode As Char) As Boolean

参数

charCode

Char

要处理的字符。

返回

Boolean

如果字符由控件作为助记键处理，则为 true；否则为 false。

示例

下面的代码示例演示了一个按钮类的扩展，该扩展重写 ProcessMnemonic 方法以显示自定义行为。 该示例还演示了 CanSelect 如何使用和 IsMnemonic 属性。 若要运行此示例，请将以下代码粘贴到同一个文件中的窗体类后面。 向窗体添加类型 MnemonicButton 按钮。

// 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.
    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

调用此方法可让控件有机会处理助记字符。 该方法应确定控件是否处于处理助记状态，以及给定字符是否表示助记。 如果是这样，该方法应执行与助记和返回 true关联的操作。 否则，该方法应返回 false。 此方法的实现通常使用 IsMnemonic 该方法来确定给定字符是否与控件文本中的助记符匹配。

例如：

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

此方法的默认实现 ProcessMnemonic 仅返回 false 以指示控件没有助记。