wpf 根据多个属性设置可见性
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Set Visibility based on multiple properties
提问by webdad3
I have a Canvas that I want to hide or show based off of 2 dependency properties:
我有一个 Canvas，我想根据 2 个依赖项属性隐藏或显示它：
IsPropA
IsPropB
If either of these are true I want the Canvas to display. If both are false I want the Canvas to be hidden.
如果其中任何一个是真的，我希望 Canvas 显示。如果两者都是假的，我希望 Canvas 被隐藏。
I know how I can do it with just 1 property. But I'm unsure of how to do it with multiple properties.
我知道如何只用 1 个属性就可以做到这一点。但我不确定如何使用多个属性来做到这一点。
<Canvas Grid.Row="2" x:Name="sesimicTeam" Visibility="{Binding IsPropA}">
回答by WiiMaxx
you could use MultiDataTrigger
你可以使用MultiDataTrigger
<Canvas Grid.Row="2" x:Name="sesimicTeam">
<Canvas.Style>
<Style>
<Setter Property="Control.Visibility" Value="Visible" />
<Style.Triggers>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding Path=IsPropA}" Value="false" />
<Condition Binding="{Binding Path=IsPropB}" Value="false" />
</MultiDataTrigger.Conditions>
<Setter Property="Control.Visibility" Value="Hidden" />
</MultiDataTrigger>
</Style.Triggers>
</Style>
</Canvas.Style>
</Canvas>
now it will show your Canvas if one of your Properties is true
现在，如果您的属性之一为真，它将显示您的画布
回答by Kevin Kalitowski
You can do this with a IMultiValueConverter. That interface accepts any number of bindings and returns a single value.
您可以使用IMultiValueConverter. 该接口接受任意数量的绑定并返回单个值。
XAML
XAML
<Canvas>
<Canvas.Resources>
<converter:BooleanToVisibilityMultiConverter x:Key="BooleanToVisibilityMultiConverter" />
</Canvas.Resources>
<Canvas.Visibility>
<MultiBinding Converter="{StaticResource BooleanToVisibilityMultiConverter}">
<Binding Path="IsPropA" />
<Binding Path="IsPropB" />
</MultiBinding>
</Canvas.Visibility>
</Canvas>
C#
C＃
public class BooleanToVisibilityMultiConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
return values.OfType<bool>().Any(b => b) ? Visibility.Visible : Visibility.Hidden;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
回答by Novitchi S
You can achieve this using a style with two triggers:
您可以使用带有两个触发器的样式来实现此目的：
<Canvas Grid.Row="2" x:Name="sesimicTeam">
<Canvas.Style>
<Style TargetType="Canvas">
<Setter Property="Visibility" Value="Collapsed"/>
<Style.Triggers>
<DataTrigger Binding="{Binding IsPropA}" Value="True">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
<DataTrigger Binding="{Binding IsPropB}" Value="True">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Canvas.Style>
</Canvas>
