wpf - 为什么当值为 false 时触发 `IsKeyboardFocusWithin` 不起作用？

Question

我想改变 InputLanguage on Textbox.GotFocusand Textbox.LostFocus，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>

它将 InputLanguage 更改为en-us但不返回fa-ir，有什么问题？

Answer 1

您还需要指定类型：

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