强制在TexBox验证时，文本在WPF的变化 [英] Enforce validation on a TexBox when text changes in WPF

问题描述

我用验证在文本框如下：

<TextBox BorderThickness="1" Style="{DynamicResource TextBoxInError}"
Validation.ErrorTemplate="{StaticResource ValidationTemplate}">
     <TextBox.Text>
         <Binding Path="TimeBeforeDeletingPicture" Mode="TwoWay">
              <Binding.ValidationRules>
                   <helpers:TimeBeforeDeletingRule/>
              </Binding.ValidationRules>
         </Binding>
     </TextBox.Text>
</TextBox>

当我离开文本框（显然，当它失去焦点），我想验证验证大火输入文字的变化，我每次使用 MVVM ，所以我不希望与事件一塌糊涂，什么是正确的清洁方式来实现这一点。

The validation fires when I leave the TextBox (apparently when it looses focus), I want to validate the input every time the text changes, I'm using MVVM so I don't want to mess with events, what's the correct clean way to achieve that.

推荐答案

设置UpdateSourcetrigger如下：

Set UpdateSourcetrigger as follows

 <TextBox.Text>
            <Binding Path="TimeBeforeDeletingPicture" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"/>

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