如何在文本框未聚焦時丟失wpf中的文本（丟失鍵盤焦點）？

Question

如何在文本框未聚焦時突出顯示Wpf中的文本？ （.NET 4.0）

Answer 1

如果你處理你的TextBox的LostFocus事件，你可以使用下面的代碼來選擇文本框的內容：

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

Answer 2

您可以使用樣式與EventTrigger爲TextBox.LostFocus/GotFoxus事件。

這將改變文本框前景色到紅用1秒的延遲，當「引發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>