在动态绑定的列表中更改单个元素的文本颜色 [英] Changing the text color of individual elements in a dynamically bound list

问题描述

目前正在使用一个Windows Phone（7.5）应用程序，其中一个页面包含绑定到元素列表的列表框。

Currently working on a little Windows Phone (7.5) application and one of the pages contains a ListBox that is bound to a list of elements.

<ListBox x:Name="MyListBox" 
    ItemsSource="{Binding Path=Listing}" 
    ItemTemplate="{StaticResource MyItemTemplate}" />

DataTemplate看起来像下面的Name和Description是类Entity的属性：

The DataTemplate looks like the following where "Name" and "Description" are properties of the class "Entity":

<DataTemplate x:Key="WordTemplate">
    <ListBoxItem Tap="WordTapped">                              
        <StackPanel Orientation="Vertical">
            <TextBlock Width="Auto" 
                     Text="{Binding Name}" 
                     FontSize="{StaticResource PhoneFontSizeLarge}"  
                     VerticalAlignment="Top" 
                     TextWrapping="Wrap"
                     Margin="12, 0, 12, 0" />
            <TextBlock Width="Auto" 
                     Text="{Binding Description}" 
                     Style="{StaticResource PhoneTextSmallStyle}" 
                     VerticalAlignment="Top"
                     TextWrapping="Wrap"                                         
                     Margin="12, 0, 12, 12" />              
        </StackPanel>
    </ListBoxItem>
</DataTemplate> 

可以根据Name / Description的实际值更改每个TextBlock？

Is it possible - depending on the actual value of Name/Description - to change the font color of each TextBlock?

推荐答案

是的，使用 ValueConverter 对刷子的描述：

Yes, use a ValueConverter that converts your Name and Description to a brush:

    <phone:PhoneApplicationPage.Resources>
        <Converters:TextToBrushConverter x:Key="yourConverter"/>
    </phone:PhoneApplicationPage.Resources>

    ...
    <TextBlock Width="Auto" 
          Text="{Binding Name}" 
          ...
          Foreground={Binding Name, Converter={StaticResource yourConverter}} />

转换器：

public class TextToBrushConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if ((string)value == "XXX")
        {
            return new SolidColorBrush(Colors.Red);
        }

        return new SolidColorBrush(Colors.Green);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

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