如何通过事件参数传递将事件绑定到ViewModel上的方法。 Silverlight 4

Question

我在某处看到这是100％可行的混合行为，找不到示例。

更好的例子是将事件参数和/或发送者作为CommandParameter传递给特定的命令。

Answer 1

<i:Interaction.Triggers> 
     <i:EventTrigger EventName="SizeChanged"> 
      <ei:CallMethodAction MethodName="WndSizeChanged" 
       TargetObject="{Binding}" /> 
     </i:EventTrigger> 
    </i:Interaction.Triggers> 

WndSizeChanged方法应该是公开的，并具有相同的签名活动delegte其订阅。

Answer 2

一个舒适的方式来创建行为是使用DelegateCommand方法，因为在棱镜：

这里阅读：Prism behavior

Answer 3

Caliburn Micro有一些很好的方法来做到这一点。

从文档：

<Button Content="Remove" 
     cal:Message.Attach="Remove($dataContext)" /> 

$eventArgs – Passes the Trigger’s EventArgs or input parameter to your Action. Note: This will be null for guard methods since the trigger hasn’t actually occurred. 
$dataContext – Passes the DataContext of the element that the ActionMessage is attached to. This is very useful in Master/Detail scenarios where the ActionMessage may bubble to a parent VM but needs to carry with it the child instance to be acted upon. 
$source – The actual FrameworkElement that triggered the ActionMessage to be sent. 
$view - The view (usually a UserControl or Window) that is bound to the ViewModel. 
$executionContext - The actions's execution context, which contains all the above information and more. This is useful in advanced scenarios. 
$this - The actual ui element to which the action is attached.