绑定KeyDown事件Silverlight [英] Binding KeyDown Event Silverlight

问题描述

我正在尝试使键绑定在视图模型内引起事件.很久以来，我一直在搜索，但很遗憾，到目前为止还没有遇到任何可行的解决方案.

I am attempting to have a key binding cause an event within the view model. I have been search for a while and have not come across any solutions that have worked thus far, unfortunately.

这基本上就是我要实现的目标:

This is what I am basically attempting to implement:

<i:Interaction.Triggers>  
    <i:EventTrigger EventName="createNew">  
       <cal:ActionMessage MethodName="newCustomer" />  
    </i:EventTrigger>  
</i:Interaction.Triggers>

我想要一种提供热键"的方法，以允许用户在视图模型内实现newCustomer事件.到目前为止，它甚至都不会进入视图模型.如果我附加EventName ="KeyDown"，则如果按下任何键，效果都很好，但是我试图定位单个键.

I am wanting a way to provide a "hotkey" to allow the user to implement a newCustomer event within the view model. So far it won't even reach into the view model. If I attach the EventName="KeyDown" it works wonderfully if any key is pressed, but I am attempting to target a single key.

我将添加视图模型中的代码如下所示.

I will add that the code behind in the view model looks like this.

public void createNew(object sender, KeyEventArgs e)
     { if (e.Key == Key.F9)
         {
             addCustomer();  
         } }

推荐答案

不太确定您使用的控件是什么，但是出于示例目的，我将使用文本框... 尚不确定这是否会有所帮助，但我希望这样做:

Not too sure what control you are using, but for example purposes I'll use a text-box... Not entirely sure if this will help even, but I hope it does:

视图:

<TextBox x:Name="MyTextBox" TextAlignment="Left" FontSize="10" Width="240" cal:Message.Attach="[Event KeyUp]=[Action ExecuteAction($executionContext)]"/>

ViewModel:
*出于示例目的，我将"Enter"用作您要在其上执行操作的单键.

The ViewModel:
* For example purposes I'll use "Enter" as the single key on which you want the actions performed.

public void ExecuteAction(ActionExecutionContext context)
    {
        var eventArgs = (KeyEventArgs)context.EventArgs;
        if (eventArgs.Key != Key.Enter) return; 
        //Execute Actions...
    }

这应该在您想要的控件上的每次按键上触发代码，如果按键不等于您指定的值，那么它将什么也不会做...

This ought to fire code on each key-press on the control you want, if the key is not equal to whatever you specify, it won't do anything...

如果我不愿意，也许我只是不正确地理解问题:D

If I'm waaay off, maybe I just don't understand the issue correctly :D

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