将 WPF 快捷键绑定到 ViewModel 中的命令 [英] Binding a WPF ShortCut Key to a Command in the ViewModel

问题描述

我有一个使用 MVVM 模式的 WPF 应用程序.将按钮连接到 VM 非常简单，因为它们实现了 ICommand.我有一个类似的上下文菜单.下一步是为上下文菜单创建快捷键.我不知道如何让快捷键调用命令.下面是一个例子:

I have a WPF app that is using the MVVM pattern. Hooking up buttons to the VM is pretty straight forward since they implement the ICommand. I have a context menu that works similar. The next step is to create shortcut keys for the context menu. I can't figure out how to get the shortcut key invoke the Command. Here is an example:

<MenuItem Header="Update" Command="{Binding btnUpdate}" >
    <MenuItem.Icon>
        <Image Source="/Images/Update.png"
               Width="16"
               Height="16" />
        </MenuItem.Icon>
    </MenuItem>

现在我添加了这个:

<Window.InputBindings>
    <KeyBinding Key="U"
                Modifiers="Control" 
                Command="{Binding btnUpdate}" />
</Window.InputBindings>

尝试将快捷键连接到相同的绑定，但这不起作用.错误是:

to try and connect the shortcut keys to the same binding, but this doesn't work. The error is:

错误 169 无法在类型为KeyBinding"的Command"属性上设置Binding".只能在 DependencyObject 的 DependencyProperty 上设置绑定".

Error 169 A 'Binding' cannot be set on the 'Command' property of type 'KeyBinding'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

没有办法将这个事件与命令挂钩吗?我想不通.

Isn't there a way to hook up this event to the Command? I can't figure this out.

提前致谢！

账单

推荐答案

我写了一个 自定义标记扩展 将InputBindings绑定"到命令，几乎可以像真正的绑定一样使用:

I wrote a custom markup extension to "bind" InputBindings to commands, which can be used almost like a real binding :

<UserControl.InputBindings>
    <KeyBinding Modifiers="Control" 
                Key="E" 
                Command="{input:CommandBinding EditCommand}"/>
</UserControl.InputBindings>

请注意，此标记扩展使用私有反射，因此只有在您的应用程序完全信任运行时才能使用它...

Note that this markup extension uses private reflection, so it can only be used if your application runs in full trust...

另一种选择是使用 CommandReference 类.它可以在 此处 的 MVVM 工具包中找到.这可能是一种更简洁的方法，但使用起来有点复杂.

Another option is to use the CommandReference class. It can be found in the MVVM toolkit available here. It's probably a cleaner approach, but a bit more complex to use.

请注意，在 WPF 4 中，InputBinding.Command、InputBinding.CommandParameter 和 InputBinding.CommandTarget 属性是依赖属性，因此它们可以正常绑定

Note that in WPF 4, the InputBinding.Command, InputBinding.CommandParameter and InputBinding.CommandTarget properties are dependency properties, so they can be bound normally

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