DataSwitch en - Leksiqq/WpfMarkupExtension GitHub Wiki

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DataSwitch class

Used in XAML markup similar to <DataTrigger>. Has a Binding attribute with the same meaning. The content consists of <DataTrigger> elements without a Binding attribute. Acts as if all <DataTrigger>s have the same Binding, but the binding value is only evaluated once.

Example

in the demo on the "Demo3" tab, calls to the calculation of the binding value are displayed on the console in the case of using <DataSwitch> and without it.

<TextBlock DockPanel.Dock="Top">
    <TextBlock.Style>
        <Style TargetType="TextBlock">
            <Style.Triggers>
                <l:DataSwitch Binding="{Binding Text, ElementName=T1, 
                          Converter={l:ParameterizedResource DataConverter},
                          ConverterParameter=T1Text|DataSwitch, Mode=OneWay}">
                    <DataTrigger Value="1">
                        <Setter Property="Text" Value="Один"/>
                    </DataTrigger>
                    <DataTrigger Value="2">
                        <Setter Property="Text" Value="Два"/>
                    </DataTrigger>
                    <DataTrigger Value="3">
                        <Setter Property="Text" Value="Три"/>
                    </DataTrigger>
                    <DataTrigger Value="4">
                        <Setter Property="Text" Value="Четыре"/>
                    </DataTrigger>
                    <DataTrigger Value="">
                        <Setter Property="Text" Value=""/>
                    </DataTrigger>
                </l:DataSwitch>
            </Style.Triggers>
            <Setter Property="Text" Value="Не могу понять"/>
        </Style>
    </TextBlock.Style>
</TextBlock>

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