wpf - 在 wpf 程序的视图模型中获取事件参数

Question

我有一个程序，我需要访问从键盘输入到视图模型中的字符。我可以使用 KeyUp 方法在后面的代码中轻松获取 KeyEventArgs，但是如何在 ViewModel 中访问它？请帮忙。

Answer 1

You need the following to pass keyEventArgs to viewmodel

1. Interaction triggers in xaml because native input binding don't support keyeventargs
<textblock>
<i:interactiontriggers>
<i:action eventname ="keyup">
<multibinding command={binding somecommand, converter={staticresource eventconverter}}">
<binding ...>
<binding...>
</multibing>
</i:action>
</i:interactiontriggers>
</textblock>

2  Create a custom command  (example, relay command) where you can initialize the command like below in viewmodel

var cmd = SomeCommand;
Customcommand c = new RelayCommand<KeyEventArgs>(cmd.Execute, cmd.CanExecute);

3. In the command action, you can access the mouseeventargs or keyeventargs.

If you look up more, you'll get an idea.