共用方式為


Control.ProcessMnemonic(Char) 方法

定義

處理助憶鍵字元。

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

參數

charCode
Char

要處理的字元。

傳回

如果控制項已將字元當成助憶鍵處理,則為 true,否則為 false

範例

下列程式碼範例示範按鈕類別的延伸模組,此類別會覆寫 ProcessMnemonic 方法以展示自訂行為。 此範例也會示範 和 IsMnemonic 屬性的使用 CanSelect 。 若要執行此範例,請在表單類別之後貼上下列程式碼,並放在相同的檔案中。 將類型的 MnemonicButton 按鈕新增至表單。

// 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

備註

呼叫這個方法,讓控制項有機會處理助記字元。 方法應該判斷控制項是否處於處理助憶鍵的狀態,以及指定的字元是否代表助憶鍵。 如果是,方法應該執行與助憶鍵相關聯的動作,並傳回 true 。 如果沒有,方法應該會傳回 false 。 此方法的實作通常會使用 IsMnemonic 方法來判斷指定的字元是否符合控制項文字中的助憶鍵。

例如:

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

此方法的預設實作 ProcessMnemonic 只會傳回 false ,表示控制項沒有助憶鍵。

適用於

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