在运行时根据枚举值更改边框背景

Question

我正在设计自定义控件我希望用户能够使用自定义属性更改背景颜色。背景颜色应由名为 Severity 的枚举指定：

代码

public enum Severity
{
    Warning,
    Information,
    Success,
    Error
}

Xaml

<Border Background="{DynamicResource InfoBarInformationalSeverityBackgroundBrush}" 
        CornerRadius="4">
    <Grid Margin="10">
        <TextBlock Text="{Binding Title, 
            RelativeSource={RelativeSource AncestorType=ib:InfoBar}}"/>
    </Grid>
</Border>

<InfoBar Severity="Error"/>

我尝试了触发器，但它似乎不起作用

更新：

Xaml

<Border>
    <Border.Style>
        <Style TargetType="Border">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Severity, 
                             RelativeSource={RelativeSource AncestorType=ib:InfoBar}}" 
                             Value="Error">
                    <Setter Property="Background" Value="Red"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding Severity, 
                             RelativeSource={RelativeSource AncestorType=ib:InfoBar}}" 
                             Value="Success">
                    <Setter Property="Background" Value="Green"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Border.Style>
</Border>

代码

public Severity Severity
{
    get { return (Severity) GetValue(SeverityProperty); }
    set { SetValue(SeverityProperty, value); }
}
    
public static readonly DependencyProperty SeverityProperty =
    DependencyProperty.Register("Severity", typeof(Brushes), typeof(InfoBar));

Answer 1

依赖项属性应注册为 Severity 而不是 Brushes:

public static readonly DependencyProperty SeverityProperty =
    DependencyProperty.Register(nameof(Severity), typeof(Severity), typeof(InfoBar));

那么假设 Border 是 InfoBar 控件的视觉子项，那么您的示例应该可以工作：

<b:InfoBar Severity="Warning">
        <Border>
            <Border.Style>
                <Style TargetType="Border">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding Severity, RelativeSource={RelativeSource AncestorType=b:InfoBar}}" Value="Warning">
                            <Setter Property="Background" Value="Red"/>
                        </DataTrigger>
                        <DataTrigger Binding="{Binding Severity, RelativeSource={RelativeSource AncestorType=b:InfoBar}}" Value="Success">
                            <Setter Property="Background" Value="Green"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Border.Style>
            <TextBlock Text="{Binding Severity, RelativeSource={RelativeSource AncestorType=b:InfoBar}}" />
        </Border>
    </StackPanel>
</b:InfoBar>

Answer 2

您可以使用转换器。传递您的枚举并转换为颜色：

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        Color colorDefalut = (Color)ColorConverter.ConvertFromString("#00afef");

        switch ((int)value)
        {
            case (int) Severity. Warning:

                return new SolidColorBrush(Colors.Yellow);

            case (int) Severity.Information:

                return new SolidColorBrush(Colors.bleu);

            case (int) Severity. Error:
                
                return new SolidColorBrush(colors.Red);

            default:

                return new SolidColorBrush(colorDefalut);
        }
    }

在运行时根据枚举值更改边框背景

change border background based on enum value in runtime

c#

wpf

triggers