我查看了this answer,但出于某种原因它并不适合我。我正在使用一个Observable LookupEntity对象集合:
public class LookupEntity
{
public bool IsSelected { get; set; }
public int Id { get; set; }
public string Code { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public bool IsInactive { get; set; }
}
我需要的是非活动项目的背景颜色(IsInactive = True)与其他项目不同。我尝试了两种方法。第一种是使用DataTrigger和Template。这应该有效,但不是:
<ListBox x:Name="RecordList"
Grid.Row="2"
MinWidth="200"
ItemsSource="{Binding MaintenanceList, Mode=TwoWay}"
HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch"
VerticalAlignment="Stretch"
BorderThickness="0"
SelectedValue="{Binding SelectedItem, Mode=TwoWay}"
IsEnabled="{Binding ContentVM.AddEnabled}"
SelectionChanged="ListBox_SelectionChanged">
<ListBox.Resources>
<Style TargetType="ListBoxItem">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsInactive}" Value="True">
<Setter Property="Background" Value="PaleVioletRed"/>
</DataTrigger>
</Style.Triggers>
</Style>
<DataTemplate DataType="{x:Type utility:LookupEntity}">
<TextBlock
Text="{Binding Title}"
ToolTip="{Binding Description}"
TextWrapping="NoWrap"
HorizontalAlignment="Left"/>
</DataTemplate>
</ListBox.Resources>
</ListBox>
第二种方法有效,但它取决于LookupEntity对象中的Background Color属性。我不喜欢这种方法,因为它给一个不应该知道它如何显示的对象赋予显示责任。将此属性添加到LookupEntity:
public SolidColorBrush BackgroundColor
{
get { return IsInactive ? Brushes.PaleVioletRed : Brushes.Transparent; }
}
绑定DataTemplate的Background属性有效,但这是不可接受的。
<ListBox.Resources>
<DataTemplate DataType="{x:Type utility:LookupEntity}">
<TextBlock
Text="{Binding Title}"
ToolTip="{Binding Description}"
TextWrapping="NoWrap"
HorizontalAlignment="Left"
Background="{Binding BackgroundColor}"/>
</DataTemplate>
</ListBox.Resources>
我想将背景颜色的责任放在皮肤/资源中,但我无法使用此设置。有没有我错过的东西?
答案 0 :(得分:3)
您的LookupEntity
课程应该实现INotifyPropertyChanged
界面。当PropertyChanged
更改时,您应该提出IsInactive
事件。
public class LookupEntity : INotifyPropertyChanged
{
private bool _isInactive;
public bool IsSelected { get; set; }
public int Id { get; set; }
public string Code { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public bool IsInactive
{
get { return _isInactive; }
set
{
_isInactive = value;
OnPropertyChanged("IsInactive");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
编辑:您可以尝试直接绑定属性,而不是使用触发器。但是,您需要使用值转换器,您必须实现它。
<Style TargetType="ListBoxItem" Background="{Binding IsInactive, Converter={StaticResource boolToColorConverter}}">
</Style>