文本框转换发送密钥：Alt + Enter – > Enter

我希望能够修改wpf文本框的行为，而无需实现新类。

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validation（movefocus …），但当他点击“ALT + Enter”时，文本框必须添加一个新行（my textbox支持多行：AcceptsReturn为true）。

我已经尝试过（在文本框中的PreviewKeyDown事件）： – 在此链接之后构建一个KeyEventArgs和一个TextCompositionEventArgs： 如何在C＃中以编程方式生成keypress事件？ – 我尝试过SendKeys.SendWait（“{ENTER}”）但它发送了许多新的行命令

有没有办法做到这一点 ？

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; } } 

Answer 1

如果用户按下Alt + Enter，只需在现有的TextBox.Text上添加一个新行。 如果他们只按Enter键，则在文本绑定上触发UpdateSource

 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; } } 

要使NewLine工作，请确保TextBox上的AcceptsReturn="True"