wpf 如何使用触发器制作文本框 Visibility=Hidden
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How to make a text box Visibility=Hidden with a trigger
提问by Russ
I seem to be having a hard time today. All I want to do is make a TextBoxhidden of visible based on a bool value databound to the Window its hosted in.
我今天好像过得很艰难。我想要做的就是TextBox根据绑定到其托管窗口的布尔值数据隐藏可见。
What I have just won't compile and I don't understand why. Please help.
我刚刚不会编译，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>
回答by Robert Macnee
You need to set the Style.TargetTypein order for it to recognize the Visibilityproperty:
您需要设置Style.TargetType以使其识别该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>
Your binding path to AllowedToSubmitprobably needs to have ElementNameset to the Window's name, as well.
您的绑定路径 toAllowedToSubmit可能也需要ElementName设置为Window的名称。
回答by Andy
Another option is to bind TextBlock.Visibilitydirectly to the property:
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>
If you want it to work like in your sample, where true hides the TextBlock, then you can write your own converter to convert opposite of the built-in BooleanToVisibilityConverter.
如果您希望它像在您的示例中一样工作，其中 true 隐藏了TextBlock，那么您可以编写自己的转换器来转换内置的BooleanToVisibilityConverter.
