我正在尝试根据 LongListSelector 的 DataContext 的布尔属性更改 LongListSelector 中的图像。我正在使用 ValueConverter 来实现这一点,并且代码确实到达了 ValueConverter 并返回了 BitmapImage 但这在屏幕上不可见。以下是一些相关代码:
XAML 代码(ItemTemplate 和 ValueConverter 声明):
<local:BoolToImage x:Key="BoolImageConverter"/>
DataTemplate x:Key="itemTemplate">
<Grid Margin="0">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Foreground="Black" Margin="0" FontFamily="Segoe WP Light" FontSize="29.333" VerticalAlignment="Center" Text="{Binding BeginTijdTimeOnly}" />
<TextBlock Grid.Column="1" TextWrapping="Wrap" Foreground="Black" Margin="0" FontFamily="/LimburgsLeed;component/Fonts/Fonts.zip#Champion" FontSize="48" VerticalAlignment="Center" Text="{Binding Artiest.Naam}" />
<Image x:Name="image" Grid.Column="2" Source="{Binding Path=isSaved, Converter={StaticResource BoolImageConverter}}" VerticalAlignment="Center" Margin="0, 0, -1, 0" MouseLeftButtonDown="fav_Click"/>
</Grid>
</DataTemplate>
如您所见,Image 绑定到 ValueConverter 和 isSaved 属性。
值转换器代码:
public class BoolToImage : IValueConverter
{
public BitmapImage TrueImage = new BitmapImage();
public BitmapImage FalseImage = new BitmapImage();
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
TrueImage.UriSource = new Uri("/Images/ThumbSelected@2x.png", UriKind.RelativeOrAbsolute);
FalseImage.UriSource = new Uri("/Images/thumb.png", UriKind.RelativeOrAbsolute);
if (!(value is bool))
{
return this.FalseImage;
}
bool b = (bool)value;
if (b)
{
return this.TrueImage;
}
else
{
return this.FalseImage;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
我不知道为什么不显示图像.. ValueConverter 不能返回 null。