条件文本绑定XAML [英] Conditional text binding XAML

问题描述

我有3个试图绑定到XAML中的Textblock的属性.一个是有条件的，另外两个是我要根据该条件显示的字符串.

I have 3 properties that I'm trying to bind to a Textblock in XAML. One is a conditional and the other two are the strings that I want to display depending on that conditional.

<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，但是现在文本块必须具有不同的名称.我可以将它转换成一个带有条件条件的TextBlock吗?

This works, but now the textblocks have to have different names. Can I turn this into one TextBlock with the conditional inside of it?

推荐答案

您可以使用Style和DataTrigger来实现:

You could achieve that with a Style and a DataTrigger:

<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>

---

另一种选择是将MultiBinding与多值转换器一起使用:

---

An alternative would be to use a MultiBinding with a multi-value converter:

<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();
    }
}

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