我有一个Canvas,我希望基于两个依赖属性来隐藏或显示它:
IsPropA
IsPropB
如果其中任何一个条件为真,我希望Canvas显示。如果两个条件都为假,我想隐藏Canvas。我知道如何使用一个属性来实现它。但是我不确定如何使用多个属性来实现它。
<Canvas Grid.Row="2" x:Name="sesimicTeam" Visibility="{Binding IsPropA}">
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>
如果你的属性中有一个为真,现在它将显示你的画布。
您可以使用 IMultiValueConverter
来实现此功能。该接口接受任意数量的绑定并返回单个值。
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#
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();
}
}
您可以使用带有两个触发器的样式来实现这一点:
<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>