如何将Label.Background绑定到变量
本文关键字:绑定 变量 Background Label | 更新日期: 2023-09-27 18:28:52
我正在从代码后面的变量中获取多个项目的状态,我想在GUI的每个选项卡上以图形方式显示这些项目的状态。我将状态显示为颜色编码标签(3种不同的颜色表示3种不同状态)。我已经想出了如何用一堆代码强制背景改变颜色,但我认为使用数据触发器会更好,但我一直无法使其发挥作用。使用调试器,它可以逐步执行例程并正确更改值,但屏幕上的颜色永远不会改变。顺便说一句,我只使用wpf和C#工作了大约6周。提前感谢你指出我的错误。
这是我的课:
class componentStatus : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged = delegate { };
private int _icc1status;
public int Icc1status
{
get
{
return this._icc1status;
}
set
{
if (value != this._icc1status)
{
this._icc1status = value;
NotifyPropertyChanged("Icc1status");
}
}
}
private int _icc2status;
public int Icc2status
{
get
{
return this._icc2status;
}
set
{
if (value != this._icc2status)
{
this._icc2status = value;
NotifyPropertyChanged("Icc2status");
}
}
}
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
这是xaml:
<Style x:Key="Icc2Status" TargetType="{x:Type Label}">
<Style.Triggers>
<DataTrigger Binding="{Binding Icc2status, UpdateSourceTrigger=PropertyChanged}" Value="2">
<Setter Property="Background" Value="Red"/>
</DataTrigger>
<DataTrigger Binding="{Binding Icc2status, UpdateSourceTrigger=PropertyChanged}" Value="1">
<Setter Property="Background" Value="Yellow"/>
</DataTrigger>
<DataTrigger Binding="{Binding Icc2status, UpdateSourceTrigger=PropertyChanged}" Value="0">
<Setter Property="Background" Value="Green"/>
</DataTrigger>
</Style.Triggers>
</Style>
<Label x:Name="icc2statusLabel" Style="{DynamicResource Icc2Status}" Content="ICC 2" HorizontalContentAlignment="Center" HorizontalAlignment="Right" Margin="0,0,260,0" VerticalAlignment="Top" Width="45" Foreground="Black" BorderThickness="1" BorderBrush="Black"/>
我的代码在后面:
public partial class MainWindow : Window
{
componentStatus compStatus = new componentStatus();
public static readonly DependencyProperty myComponentProperty =
DependencyProperty.Register("Icc2status", typeof(int), typeof(Label), new PropertyMetadata(null));
//GUI for Invent Program
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
}
//This button is for test purposes only
private void test_Click(object sender, RoutedEventArgs e)
{
compStatus.Icc1status = 2;
compStatus.Icc2status = 1;
}
//Routine to force color change of the system state when it changes
//I think data triggers are probably a better option
private void component_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
//Get the new component status
//if (compStatus.Icc1status == 0) icc1statusLabel.Background = new SolidColorBrush(Colors.Green);
//if (compStatus.Icc1status == 1) icc1statusLabel.Background = new SolidColorBrush(Colors.Yellow);
//if (compStatus.Icc1status == 2) icc1statusLabel.Background = new SolidColorBrush(Colors.Red);
}
}
绑定路径相对于DataContext
,因此将DataContext
从this
更改为compStatus
。另外,去掉你的myComponentProperty
,因为它在这里似乎没有任何作用。
DataContext不正确。它应该设置为compStatus。
this.DataContext = compStatus;