ListViewItem 不使用绑定的 IValueConverter 更改前景色

Question

我的麻烦是我希望我的 WPF ListView 根据绑定到 ListViewItems 的项目以不同的颜色显示。下面是重现该问题的所有代码。该应用程序具有“有库存”或“无库存”的小部件。如果有库存，ListView 中应该有绿色文本，否则为红色。着色由我的 BoolToColorConverter 处理（将 Widget.InStock 转换为 Colors.Green 或 Colors.Red）。断点确保 Convert() 被命中。我可能做了一些明显错误的事情，但我不知所措，因为硬编码前景色按预期工作。提前致谢。

MainWindow.xaml

<Window x:Class="ListViewItemColors.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:ListViewItemColors" Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
    <local:WidgetsViewModel />
</Window.DataContext>
<Window.Resources>
    <local:BoolToColorConverter x:Key="BoolToColor" />
</Window.Resources>
<DockPanel >
    <ListView ItemsSource="{Binding Path=Widgets }">
        <ListView.View>
            <GridView>
                <GridViewColumn Width="150" Header="Widget Name">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Path=Name}" Foreground="{Binding Path=InStock, Converter={StaticResource BoolToColor}}" />
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
                <GridViewColumn Width="50" Header="Size" DisplayMemberBinding="{Binding Size}"></GridViewColumn>
                <GridViewColumn Width="75" Header="In Stock?" DisplayMemberBinding="{Binding InStock}"></GridViewColumn>
            </GridView>
        </ListView.View>
    </ListView>
</DockPanel>

BoolToColorConverter.cs

public class BoolToColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var val = (bool)value;
        return val ? Colors.Green : Colors.Red;
    }

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

WidgetsViewModel.cs

public class WidgetsViewModel
{
    public WidgetsViewModel()
    {
        Widgets = new Widgets
                      {
                          new Widget {InStock = true, Name = "Flipper", Size = 10},
                          new Widget {InStock = false, Name = "Gizmo", Size = 6},
                          new Widget {InStock = true, Name = "Gizmo", Size = 8},
                          new Widget {InStock = true, Name = "Whirlygig", Size = 15},
                          new Widget {InStock = false, Name = "Gutter", Size = 1},
                          new Widget {InStock = false, Name = "Gutter", Size = 2}
                      };
    }

    public Widgets Widgets { get; set; }
}

Widget.cs

public class Widget : INotifyPropertyChanged
{
    private string _name;
    public string Name
    {
        get { return _name; }
        set
        {
            if (_name == value) return;
            _name = value;
            OnPropertyChanged("Name");
        }
    }

    private int _size;
    public int Size
    {
        get { return _size; }
        set
        {
            if (_size == value) return;
            _size = value;
            OnPropertyChanged("Size");
        }
    }

    private bool _inStock;
    public bool InStock
    {
        get { return _inStock; }
        set
        {
            if (_inStock == value) return;
            _inStock = value;
            OnPropertyChanged("InStock");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void OnPropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null)
        {
            var e = new PropertyChangedEventArgs(propertyName);
            handler(this, e);
        }
    }
}

Widgets.cs

    public class Widgets : ObservableCollection<Widget> { }

Answer 1

TextBlock.Foreground 属性采用画笔，而不是颜色。更改您的转换器，使其返回 SolidColorBrush，例如：

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
    var val = (bool)value;
    return new SolidColorBrush(val ? Colors.Green : Colors.Red);
} 

Answer 2

这对我有用：

enter code here
 <ListView.ItemContainerStyle>
           <Style TargetType="ListViewItem">
                <Setter Property="Foreground" 
                 Value="{Binding FColor,Mode=OneWay,UpdateSourceTrigger=PropertyChanged, Converter={StaticResource ColorConverter}}"/>   
           </Style>
        </ListView.ItemContainerStyle>
        <ListView.View>
            <GridView>                    
                <GridViewColumn Header="Category" 
                   DisplayMemberBinding="{Binding CatDesc,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}"
                                  Width="450"/>                    
            </GridView>
        </ListView.View>