使用Converter的数据触发不起作用 [英] Data Trigger using Converter not working
本文介绍了使用Converter的数据触发不起作用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试根据其值更新文本块的颜色。似乎很简单,但是不起作用。
I am trying to update the color of textblock depending on it value. Seems simple however not working.
这是文本块xaml。
<TextBlock
Grid.Column="1"
Grid.Row="1"
Text="{Binding Path=GL, StringFormat={}{0:N0}}"
HorizontalAlignment="Left"
FontFamily="Verdana"
Foreground="Tomato"
FontWeight="Bold"
VerticalAlignment="Center"
Margin="5,2,5,0"
FontSize="18"
>
<TextBlock.Resources>
<converters:ColorConverter x:Key="CoConverter"></converters:ColorConverter>
</TextBlock.Resources>
<TextBlock.Style>
<Style>
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Text, Converter={StaticResource ResourceKey=CoConverter}}" Value="true">
<Setter Property="TextBlock.Foreground" Value="LimeGreen" />
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
此处是转换器
public class ColorConverter : MarkupExtension, IValueConverter
{
#region IValueConverter Members
public object Convert(object value,
Type targetType,
object parameter,
System.Globalization.CultureInfo culture)
{
if (value == null)
return false;
if (value.ToString().Length == 0)
return false;
if (System.Convert.ToDouble(value) >= 0)
return true;
return false;
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
return this;
}
}
转换器看起来不错,但触发器未应用
The converter looks good, however the trigger is not applying for some reason.
推荐答案
<TextBlock
Grid.Column="1"
Grid.Row="1"
Text="{Binding Path=GL, StringFormat={}{0:N0}}"
HorizontalAlignment="Left"
FontFamily="Verdana"
FontWeight="Bold"
VerticalAlignment="Center"
Margin="5,2,5,0"
FontSize="18"
>
<TextBlock.Resources>
<converters:ColorConverter x:Key="CoConverter"></converters:ColorConverter>
</TextBlock.Resources>
<TextBlock.Style>
<Style>
<Setter Property="TextBlock.Foreground" Value="Tomato" />
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Text, Converter={StaticResource ResourceKey=CoConverter}}" Value="true">
<Setter Property="TextBlock.Foreground" Value="LimeGreen" />
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
您需要以自己的样式设置Foreground属性,以便在运行时动态更改它。
You need to set the Foreground property in your style to change it dynamically at runtime.
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