根据多个属性设置可见性

Question

我有一个Canvas,我想隐藏或显示基于2依赖属性:

IsPropA
IsPropB

如果其中任何一个都为真,我希望Canvas显示.如果两者都是假的,我希望隐藏Canvas.

我知道如何用一个属性来做到这一点.但我不确定如何使用多个属性.

<Canvas Grid.Row="2" x:Name="sesimicTeam" Visibility="{Binding IsPropA}">

Answer 1

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>

现在,如果您的某个属性为true,它将显示您的Canvas

Answer 2

你可以用一个IMultiValueConverter.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();
    }
}

Answer 3

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>