获得焦点和 KeyEventArgs

Question

        private void TextBox27_GotFocus(object sender, RoutedEventArgs e)
        {
            Stil53.Begin();
            TextBox27.Select(TextBox27.Text.Length, 0);
            Takvim_Kapat();
            KeyEventHandler mhth = new KeyEventHandler(TextBox27_PreviewKeyUp); <=////this
        }

        private void TextBox27_PreviewKeyUp(object sender, KeyEventArgs e)
        {
            Listelemeler.Para_Birimi_Noktalama(TextBox27, e);
        }

在 gotfocus 事件中，我试图触发 KeyEventArgs 事件。我怎样才能实现这个目标？你能给我一个主意吗？提前谢谢你

在 gotfocus 事件中，我试图触发 KeyEventArgs 事件。我怎样才能实现这个目标？你能给我一个主意吗？提前谢谢你

Answer 1

解决方案示例：

    private void TextBox27_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        var textBox = (TextBox)sender;
        bool commaExists = textBox.Text.Contains(",");
        int maxLength = 9;
        if(textBox.Text.Length >= maxLength)
        {
            e.Handled = true;
            return;
        }

        if (e.Key == Key.Decimal || e.Key == Key.OemPeriod || e.Key == Key.OemComma)
        {
            if (!commaExists)
            {
                // Replace dot with comma
                int caretIndex = textBox.CaretIndex;
                textBox.Text = textBox.Text.Insert(caretIndex, ",");

                // Move caret after the comma
                textBox.CaretIndex = caretIndex + 1;

                // Mark the event as handled
                e.Handled = true;
            }
            return;
        }

        if (!((e.Key >= Key.D0 && e.Key <= Key.D9) || (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)))
        {
            // If the pressed key is not a number, mark the event as handled
            e.Handled = true;
            return;
        }
    }