Question

<ListBox x:Name="noteListBox" 
                 VerticalAlignment="Stretch" 
                 HorizontalAlignment="Stretch" Foreground="#FF329BD6" Margin="0,24,0,85">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBlock x:Name="noteTitle"
                            FontSize="40"
                            Text="{Binding Titolo}"
                            Tag="{Binding FileName}"
                            Foreground="#FF45B1EE" Tap="apriNota" Margin="5,0,0,0" />
                        <TextBlock x:Name="noteDateCreated"
                            Text="{Binding DateCreated}"
                            Margin="10,0,0,10" Foreground="#FF60ADD8" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

我需要在TextBlocks内动态更改这两个StackPanel的前景颜色。问题是它们似乎无法通过我的C＃代码访问，因为它们位于StackPanel中。

基本上这就是我需要做的事情：

noteTitle.Foreground = new SolidColorBrush(Color.FromArgb(255, 50, 155, 214));

但我在C＃代码中找不到noteTitle ...我该如何解决这个问题？

谢谢！

Answer 1

我建议将值转换器用于此类目的。我假设前景值取决于你绑定的proeprties FileName，DateCreated的对象状态，所以只需将此对象用作converetr参数，并在转换器中进行主要计算以确定应返回哪个Foreground这个特别的项目。

public class EntityToForegroundConverter : System.Windows.Data.IValueConverter
{
    public object Convert(object value, 
                         Type targetType, 
                         object parameter, 
                         CultureInfo culture) 
    {
        var entity = value as IMyEntity;
        // TODO: determine a foreground value based on bound 
        // object proerrty values
    }

    public object ConvertBack(object value, 
                              Type targetType, 
                              object parameter, 
                              CultureInfo culture)
    {
        return null;
    }
}

<Control.Resources>
    <src:EntityToForegroundConverter x:Key="foregroundConverter"/>
</Control.Resources>

<TextBlock 
   Foreground="{Binding Converter={StaticResource foregroundConverter}}" />

Answer 2

如果你想要get元素，你可以使用这段代码： var a = noteListBox.ItemTemplate.LoadContent（）as StackPanel; （a作为StackPanel）.Background = Brushes.Red;

        foreach (UIElement  child in a.Children)
        {
            if (child is TextBlock)
                if ((child as TextBlock).Name.CompareTo("noteDateCreated") == 0)
                {
                    (child as TextBlock).Foreground = Brushes.Red;
                }
        }

或者您想要更改更改模板，您可以按代码创建模板，并覆盖模板：

DataTemplate template = new DataTemplate（typeof（Test））; FrameworkElementFactory spOuterFactory = new FrameworkElementFactory（typeof（StackPanel））; FrameworkElementFactory block1 = new FrameworkElementFactory（typeof（TextBlock））; FrameworkElementFactory block2 = new FrameworkElementFactory（typeof（TextBlock））;

        block1.SetValue(TextBlock.ForegroundProperty, Brushes.Red);
        Binding binding1 = new Binding();
        binding1.Path = new PropertyPath("Titolo");
        block1.SetBinding(TextBlock.TextProperty, binding1);

        block2.SetValue(TextBlock.ForegroundProperty, Brushes.Red);
        Binding binding2 = new Binding();
        binding2.Path = new PropertyPath("noteDateCreated");
        block2.SetBinding(TextBlock.TextProperty, binding2);         


        spOuterFactory.AppendChild(block1);
        spOuterFactory.AppendChild(block2);

        template.VisualTree = spOuterFactory;
        noteListBox.ItemTemplate = template;

如何在C＃中访问StackPanel中项目的属性？

2 个答案: