如何在文本框未聚焦时丢失wpf中的文本（丢失键盘焦点）？

Question

如何在文本框未聚焦时突出显示Wpf中的文本？ （.NET 4.0）

Answer 1

如果你处理你的TextBox的LostFocus事件，你可以使用下面的代码来选择文本框的内容：

textBox.SelectAll(); 
e.Handled = true; 

Answer 2

您可以使用样式与EventTrigger为TextBox.LostFocus/GotFoxus事件。

这将改变文本框前景色到红用1秒的延迟，当“引发LostFocus”是“真”

<Style x:Key="tboxStandard" 
    TargetType="{x:Type TextBox}"> 
<Setter Property="BorderThickness" 
     Value="2" /> 
<Setter Property="BorderBrush" 
     Value="#292929" /> 
<Setter Property="Background" 
     Value="#E9E9E9" /> 
<Setter Property="TextAlignment" 
     Value="Center" /> 
<Setter Property="Foreground" 
     Value="#191919" /> 
<Style.Triggers> 
    <EventTrigger RoutedEvent="TextBox.GotFocus"> 
    <EventTrigger.Actions> 
     <BeginStoryboard> 
     <Storyboard> 
      <ColorAnimation Storyboard.TargetProperty="(TextBox.Foreground).(SolidColorBrush.Color)" 
          To="#191919" 
          Duration="0:0:1" /> 
     </Storyboard> 
     </BeginStoryboard> 
    </EventTrigger.Actions> 
    </EventTrigger> 
    <EventTrigger RoutedEvent="TextBox.LostFocus"> 
    <EventTrigger.Actions> 
     <BeginStoryboard> 
     <Storyboard> 
      <ColorAnimation Storyboard.TargetProperty="(TextBox.Foreground).(SolidColorBrush.Color)" 
          To="Red" 
          Duration="0:0:1" /> 
     </Storyboard> 
     </BeginStoryboard> 
    </EventTrigger.Actions> 
    </EventTrigger> 
</Style.Triggers>