在 wpf 程序的视图模型中获取事件参数答案

【问题标题】：Get event args in view model of a wpf program在 wpf 程序的视图模型中获取事件参数
【发布时间】：2015-01-30 05:40:45
【问题描述】：

我有一个程序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。

【问题讨论】：

标签： wpf mvvm keyboard-events wpf-4.0 mvvm-toolkit

【解决方案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.

【讨论】：