WPF通过事件调用命令 [英] WPF calling commands via events

问题描述

是否可以通过WPF中的事件调用命令？

我有一个保存按钮，当按下时调用命令，当您完成编辑文本框，它还将一个对象作为命令参数传递

 &Button Button =SaveCommand ={Binding DataContext.SaveQueueTimeCommand，RelativeSource = {RelativeSource FindAncestor，AncestorType = {x：Type ItemsControl}}}CommandParameter ={Binding}/> 
 

我最理想的做法是调用这个命令，并传递对象作为参数，当文本框失去焦点，而不是必须按下按钮：

 < Button LostFocus ={Binding SaveQueueTimeCommand}/ > 
  

仍然以某种方式将对象作为参数传递。
有一种方法可以不使用代码背后，因为我使用MVVM模式

感谢您的时间

 <$ c $ 
 c>< Grid xmlns：i =http://schemas.microsoft.com/expression/2010/interactivity> 
< i：Interaction.Triggers> 
< i：EventTrigger EventName =SomeEvent> 
< i：InvokeCommandAction Command ={Binding Path = SomeCommand，Mode = OneWay}/> 
< / i：EventTrigger> 
< / i：Interaction.Triggers> 
< / Grid> 
  

我为了后代添加了这个。

Is it possible to call a command via an event in WPF?

I have a save button that when pressed calls a command, this is pressed when you have finished editing a textbox, it also passes an object as a command parameter

 <Button Content="Save"  Command="{Binding DataContext.SaveQueueTimeCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}" CommandParameter="{Binding}" />

What I would ideally like to do is call this command and pass the object as a parameter when the textbox loses focus, rather than having to press the button, something like:

 <Button LostFocus="{Binding SaveQueueTimeCommand}" />

And still somehow pass the object as a parameter. Is there a way to acheive this without using code behind as I am using the MVVM pattern

Thanks for your time

解决方案

The simplest way to do this is using an interaction trigger.

<Grid xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="SomeEvent">
            <i:InvokeCommandAction Command="{Binding Path=SomeCommand, Mode=OneWay}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</Grid>

I have added this for posterity sake.

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