wpf - 当值为false时，为什么在IsKeyboardFocusWithin上触发不起作用？

我想更改Textbox.GotFocus和Textbox.LostFocus上的InputLanguage，所以我这样做：

<Style TargetType="{x:Type TextBox}" x:Key="EnglishTextStyle">
    <Style.Triggers>
        <Trigger Property="IsKeyboardFocusWithin" Value="True">
            <Setter Property="InputLanguageManager.InputLanguage" Value="en-us" />
        </Trigger>
        <Trigger Property="IsKeyboardFocusWithin" Value="False">
            <Setter Property="InputLanguageManager.InputLanguage" Value="fa-ir" />
        </Trigger>
    </Style.Triggers>
</Style>

它会将InputLanguage切换为en-us，但不会将其返回给fa-ir，这是什么问题？

最佳答案

您还需要指定类型：

<Trigger Property="TextBox.IsKeyboardFocusWithin" Value="False">
     <Setter Property="TextBox.InputLanguageManager.InputLanguage" Value="fa-ir" />
</Trigger>