如何制作文本框Visibility =使用触发器隐藏

Question

我今天似乎很难过.我想要做的就是TextBox根据bool值数据绑定到其托管的Window中隐藏可见.

我刚才不会编译,我不明白为什么.请帮忙.

<TextBlock Grid.Column="2" Text="This order will be sent to accounting for approval" 
           Foreground="Red" VerticalAlignment="Center" FontWeight="Bold" Padding="5">
    <TextBlock.Style>
        <Style>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=AllowedToSubmit}" Value="True">
                    <Setter Property="Visibility" Value="Hidden" /> 
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

Answer 1

您需要设置Style.TargetType它以便它识别Visibility属性:

<TextBlock Grid.Column="2" VerticalAlignment="Center" FontWeight="Bold" Foreground="Red" Padding="5" Text="This order will be sent to accounting for approval">
    <TextBlock.Style>
        <Style TargetType="{x:Type TextBlock}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=AllowedToSubmit}" Value="True">
                    <Setter Property="Visibility" Value="Hidden"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

您的绑定路径AllowedToSubmit可能也需要ElementName设置为该Window名称.

Answer 2

另一种选择是TextBlock.Visibility直接绑定到属性:

<Window>
    <Window.Resources>
        <BooleanToVisibilityConverter x:Key="BoolToVisibility" />
    </Window.Resources>
    <TextBlock Visibility="{Binding Path=AllowedToSubmit, Converter={StaticResource BoolToVisibility}}" />
</Window>

如果你希望它像你的样本一样工作,真正隐藏它TextBlock,那么你可以编写自己的转换器来转换内置的相反BooleanToVisibilityConverter.