WPF MVVM 文本框文本绑定与 changedText 事件 [英] WPF MVVM textbox text binding vs changedText event

问题描述

我有一个 Text 属性绑定到 viewmodel 的文本框.我已将 TextChanged 事件绑定到视图模型.

I have textbox with Text property binded to viewmodel. I have binded TextChanged event to viewmodel.

但问题是，当文本框失去焦点时，事件会触发每个符号添加到文本框(这很好)并且视图模型中的文本会刷新(这对我不利).

But the problem is that the event fires every sign is added to textbox(that's good) and Text in viewmodel is refreshed when textbox lost focus(that's bad for me).

如何让这个 Text 属性在每次签名后刷新?

How to make this Text property refreshing after each sign?

或者如何将发送者作为参数发送?我认为发件人会刷新数据.

Or how to send sender as parameter? I think sender would have resfreshed data.

我的交互 xaml:

<interactivity:Interaction.Triggers>
    <interactivity:EventTrigger EventName="TextChanged">
        <helpers:CustomCommandInvoker Command="{Binding UnlockChangedCommand}"   />
     </interactivity:EventTrigger>
 </interactivity:Interaction.Triggers>

我正在使用 RelayCommand.

I'm using RelayCommand.

推荐答案

对此有一个非常简单的答案；使用 UpdatePropertyTrigger=PropertyChanged.这将在每次更改字符时更新您的 VM 属性.不需要触发器或命令:-)

There is a really simple answer to this; use UpdatePropertyTrigger=PropertyChanged. This will update your VM property each time a character is changed. No need for triggers or commands :-)

<TextBox Text="{Binding ViewModelProperty, UpdateSourceTrigger=PropertyChanged}"></TextBox>

阅读此处了解更多信息:http://msdn.microsoft.com/en-us/library/system.windows.data.updatesourcetrigger(v=vs.110).aspx

Read here for more info: http://msdn.microsoft.com/en-us/library/system.windows.data.updatesourcetrigger(v=vs.110).aspx

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