条件文本绑定XAML

Question

我有3个属性,我试图绑定到XAML中的Textblock.一个是条件,另外两个是我想要显示的字符串,具体取决于条件.

<TextBlock Text="{Binding TrueText}" Style="{StaticResource styleSimpleText}" Visibility="{Binding ShowTrueText, Converter={StaticResource boolToVisibilityConverter}}"/>
<TextBlock Text="{Binding FalseText}" Style="{StaticResource styleSimpleText}" Visibility="{Binding ShowTrueText, Converter={StaticResource invertedBoolToVisibilityConverter}}"/>

这有效,但现在文本块必须有不同的名称.我可以把它变成一个带有条件的TextBlock吗？

Answer 1

您可以使用Style和DataTrigger实现:

<TextBlock>
    <TextBlock.Style>
        <Style TargetType="TextBlock">
            <Setter Property="Text" Value="{Binding FalseText}"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding ShowTrueText}" Value="True">
                    <Setter Property="Text" Value="{Binding TrueText}"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

另一种方法是使用MultiBinding和多值转换器:

<TextBlock>
    <TextBlock.Text>
        <MultiBinding Converter="{StaticResource TextConverter}">
            <Binding Path="TrueText"/>
            <Binding Path="FalseText"/>
            <Binding Path="ShowTrueText"/>
        </MultiBinding>
    </TextBlock.Text>
</TextBlock>

转换器看起来像这样:

public class TextConverter : IMultiValueConverter
{
    public object Convert(
        object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        var trueText = (string)values[0];
        var falseText = (string)values[1];
        var showTrueText = (bool)values[2];
        return showTrueText ? trueText : falseText;
    }

    public object[] ConvertBack(
        object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}