请帮助使用此语法 [英] Please help with this syntax

问题描述

我有一个组合框，其列表项在后面的代码中填充.但是，我正在使用DataTemplate并在其中包含此TextBlock. ****怎么了?基本上，下拉列表中的值需要传递给转换器.

I have a combo-box whose list items are populated in code behind. However, I am using a DataTemplate and have this TextBlock in it. What goes at ****? Basically, the values in the drop-down need to be passed to the converter.

< TextBlock Text =" {Binding}"前景="{绑定****，转换器= {StaticResource colorConverter}}" />

<TextBlock Text="{Binding}" Foreground="{Binding ****, Converter={StaticResource colorConverter}}" />

谢谢.

推荐答案

根据您的描述，我不完全了解您想要实现的目标，您能否更详细地描述您的问题?你想要什么?

According to your description, I don't fully understand what you want to achieve, can you describe your problem in more detail ? what do you want？

下面是我的示例，以演示如何使用转换器.希望这对您有所帮助.

Below is my sample to show how to use the Converter. Hope this is helpful to you.

在XMAL中:

    <Window.Resources>
        <local:ColorConverter x:Key="colorConverter" />
    </Window.Resources>

<StackPanel 
            <TextBlock
             Width="80"
             Height="25"
             Margin="0,7,0,7"
             Background="{Binding ElementName=ComboBox_ColorSelect, Path=SelectedValue, Converter={StaticResource colorConverter}}" />
            <ComboBox
             x:Name="ComboBox_ColorSelect"
             Width="80"
             Height="25"
             Cursor="Hand"
             DisplayMemberPath="Name"
             ItemsSource="{Binding ColorList}"
             SelectedValue="{Binding SelectedColor}"
             SelectedValuePath="ID" />
        </StackPanel>

C#:

public partial class ConverterWindow : Window
   {
       public ConverterWindow ()
       {
           InitializeComponent();
           this.DataContext = new ConverterViewModel();
       }
   }

public class ConverterViewModel
   {
       public class ColorInfo
       {
           public int ID { get; set; }
           public string Name { get; set; }
       }
       public IList<ColorInfo> ColorList { get; set; }
       public int SelectedColor { get; set; }
       public ConverterViewModel()
       {
           ColorList = new List<ColorInfo>()
           {
               new ColorInfo(){ ID=0, Name="red"},
               new ColorInfo(){ ID=1, Name="green"},
               new ColorInfo(){ ID=2, Name="blue"}
            };
           SelectedColor = 1;
       }
   }
 
   public class ColorConverter : IValueConverter
   {
       public static Color[] ColorCollection = new Color[] {
                                                   Color.FromRgb(255,0,0),//red  
                                                   Color.FromRgb(0,255,0),//green  
                                                   Color.FromRgb(0,0,255)//blue  
                                               };
 
       public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
       {
           if (value == null)
               return new SolidColorBrush(ColorCollection[0]);
           try
           {
               return new SolidColorBrush(ColorCollection[(int)value]);
           }
           catch
           {
               return new SolidColorBrush(ColorCollection[0]);
           }
       }
 
       public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
       {
           throw new NotImplementedException();
       }
   }

最好的问候，

Best Regards,

鲍勃

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