文本框转换发送键:Alt + Enter ->进入

我希望能够修改wpf文本框的行为，而不需要实现一个新的类。

我想要一个像输入/Alt+ enter行为的Excel，当用户点击"enter"时，文本框被验证(movefocus…)，但是当他点击"Alt+ enter"时，文本框必须添加新行(我的文本框支持多行:AcceptsReturn为真)。

我已经尝试过(在文本框PreviewKeyDown事件):-在这个链接后面构造一个KeyEventArgs和一个textcompostioneventargs:我如何在c#中以编程方式生成按键事件?-我试过SendKeys.SendWait("{ENTER}")，但它发送了许多新行命令

有办法吗?

谢谢

    private void m_MeasurementName_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        var tb = (sender as TextBox);
        if (Keyboard.Modifiers == ModifierKeys.Alt && Keyboard.IsKeyDown(Key.Enter))
        {
            // 1st try
            var key = "'n'r";
            var routedEvent = Keyboard.KeyDownEvent;
            tb.RaiseEvent(new TextCompositionEventArgs(InputManager.Current.PrimaryKeyboardDevice, new TextComposition(InputManager.Current, tb, key)) { RoutedEvent = routedEvent });
            // 2nd
            var key = Key.Enter;
            var routedEvent = TextCompositionManager.TextInputEvent;
            tb.RaiseEvent(new KeyEventArgs(Keyboard.PrimaryDevice, PresentationSource.FromVisual(tb), 0, key) { RoutedEvent = routedEvent });
            // 3rd
            System.Windows.Forms.SendKeys.SendWait("{ENTER}");
            // 4th Strangely works but not ... you know
            MessageBox.Show("ALT+ENTER");
            e.Handled = true;
        }
        else if (Keyboard.IsKeyDown(Key.Enter))
        {
            tb.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
            e.Handled = true;
        }
    }

private void m_MeasurementName_PreviewKeyDown(object sender, KeyEventArgs e)
{
    var tb = (sender as TextBox);
    if (Keyboard.Modifiers == ModifierKeys.Alt && Keyboard.IsKeyDown(Key.Enter))
    {
        tb.Text += "'r'n";
        tb.SelectionStart = tb.Text.Length;
        e.Handled = true;
    }
    else if (Keyboard.IsKeyDown(Key.Enter))
    {
        var textBinding = BindingOperations.GetBindingExpression(
            tb, TextBox.TextProperty);
        if (textBinding != null)
            textBinding.UpdateSource();
        e.Handled = true;
    }
}