WP7：基於另一個文本塊的值更改文本塊前景色

Question

說我有這樣的XAML：

<TextBlock Name="t1" Text="{Binding team1}" Foreground="White" FontSize="32" /> 
<ListBox Name="lbBooks" Width="441" Height="490" > 
    <ListBox.ItemTemplate> 
     <DataTemplate x:Name="d1" > 
     <StackPanel Name="spMain">  
      <StackPanel Orientation="Horizontal" >       
      <HyperlinkButton Content="{Binding BookName}" Margin="5" Width="230" TargetName="_blank" NavigateUri="{Binding BookWebsite}"/> 

      <StackPanel Orientation="Vertical" HorizontalAlignment="Right" Margin="0,0,0,0" > 
       <TextBlock Name="b1" Text="{Binding BookLine1}" Margin="5" Width="160" HorizontalAlignment="Right"></TextBlock> 
       <TextBlock Name="b1U" Text="{Binding BookLine2}" Margin="5" Width="160" Foreground="Wheat" HorizontalAlignment="Right"></TextBlock> 
       <TextBlock Name="b3" Text="{Binding BookLine3}" Margin="5" Width="160" DataContext="{Binding team1,Converter={StaticResource tbConverter}, ElementName=b3, Mode=TwoWay}" HorizontalAlignment="Right"></TextBlock> 
      </StackPanel> 
     </StackPanel>  
     </StackPanel> 
     </DataTemplate> 
    </ListBox.ItemTemplate> 
</ListBox> 

我想改變命名TextBlock的前景色「B3」根據TextBlock的「T1」的價值。我知道我需要實現一個轉換器有點像下面這樣：

public class TBConverter : IValueConverter 
    { 
     public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
     { 
      //do I need to check against the Textblock t1 value in here? 
      if (value != null && t1.Text == "Text that triggers change") 
      { 
      //need code to change Textblock foreground color 
      } 
      return null; 
     } 

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

因此，（1）什麼是我需要在轉換器的代碼更改文本塊B3的前景色？ 和（2），我是否正確調用了文本塊「b3」的datacontext中的轉換器？ 謝謝！

Answer 1

如果你的文本塊B1已經綁定到一個變量（這裏TEAM1），你也可以綁定T3的前景將其與轉換器：

Foreground="{Binding team1, Converter={StaticResource YourConverter}}" 

，並在轉換器tema1的價值將被傳遞作爲值（oject）：

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)    
{     
    var team1 = valus as YourType 
    if(team1 == xxx) 
    { 
    return newColorBrush; 

    }else{ 

    return defaultColorBrush; //maybe from your styles etc... 

    } 

}