Question

我在Style中设置了前景：

<Style x:Key="ValueStyle" TargetType="{x:Type TextBlock}" BasedOn="{StaticResource SubHeadingFontStyle}">
    <Setter Property="HorizontalAlignment" Value="Center"/>
    <Setter Property="VerticalAlignment" Value="Center"/>       
    **<Setter Property="v:DynamicProperties.ForegroundKey" Value="{Binding Color, Mode=OneWay, Converter={v:SignalColorToResourceKeyConverter}}" />**
</Style>

我有DataTemplete：

<DataTemplate DataType="{x:Type vs:NumericVisualizerElement}">
    <TextBlock x:Name="AverageValue"
               **Style="{StaticResource ValueStyle}"**
               Text="{Binding Path=AverageValue, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}" />
    <DataTemplate.Triggers>
        **<DataTrigger Binding="{Binding Path=Color}" Value="None">
            <Setter Property="TextBlock.Foreground" Value="Red" />
        </DataTrigger>**
    </DataTemplate.Triggers>
</DataTemplate>

在v：SignalColorToResourceKeyConverter中，如果Color为＆＃34; None＆＃34;然后返回DependencyProperty.UnsetValue。但是当颜色为无时，我想前景为红色。当第一次加载是Color是None然后Foreground有红色，但是当我在运行时改变Color然后返回Color是None，Foreground不是Red，它是UnsetValue。怎么解决？谢谢你的帮助！

编辑1：我定义了枚举SignalColor

 public enum SignalColor
{
    None,
    Signal01A,
    Signal02A,
    Signal03A,
}

在SignalColorToResourceKeyConverter.cs中

和方法转换：

 public object Convert(object value, Type tagertType, object parameter, System.Globalization.CultureInfo culture)
    {

        var signalColor = (SignalColor) value;

        switch (signalColor)
        {
            case SignalColor.None:
                return DependencyProperty.UnsetValue;
            case SignalColor.Signal01A:
                return "Signal01ABrush";
            case SignalColor.Signal01B:
                return "Signal01BBrush";
        }
     }

我希望当我选择颜色为None时，前景将覆盖为红色。我想在文件xaml中执行此操作。

Answer 1

试试这个 Xaml代码：

Foreground="{Binding RowForeColor,
 Converter={StaticResource StringToColorConverter}}"

转换器代码

public object Convert(object value, Type targetType, object parameter, string language)
    {
        if ((string)value == "Red")
        {
            return "Red";
        }
        else  if((string)value == "White")
        {
            return "White";
        }
        else if ((string)value == "LightGray")
        {
            return "LightGray";
        }
        else if((string)value =="Pink")
        {
            return "Pink";
        }
        return "Black";
    }

更改颜色在XAML中不起作用？

1 个答案: