LinieSeries 颜色绑定不起作用 oxyPlot

Question

我正在尝试将 LineSeries Color 绑定到我的视图模型。它没有效果。怎么了？

Datacontext 在 MainWindow 中设置。之所以有效，是因为我从 Chartpoints 获取数据。

<UserControl x:Class="MyLayerThicknessApp.UserControls.RefAufnehmenEdit"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:oxy="clr-namespace:OxyPlot.Wpf;assembly=OxyPlot.Wpf"
             xmlns:local="clr-namespace:MyLayerThicknessApp.UserControls"
             mc:Ignorable="d" 
             d:DesignHeight="850" d:DesignWidth="1000">
    <Grid>
            <!--Chart-->
                <oxy:Plot 
                      LegendOrientation="Vertical"
                      LegendPlacement="Outside"
                      LegendPosition="RightTop" Grid.Row="1" IsEnabled="False">
                    <oxy:Plot.Axes>
                        <oxy:LinearAxis Position="Bottom" Minimum="400" Maximum="850"  MajorGridlineStyle="None" MinorGridlineStyle="None" Title="Wellenlänge [nm]" />
                <oxy:LinearAxis Position="Left" Minimum="0" Maximum="4000" Title="Intensität" MajorStep="1000" MajorGridlineStyle="Automatic" MinorGridlineStyle="None"/>
            </oxy:Plot.Axes>
                    <oxy:Plot.Series>
                        <oxy:LineSeries 

                                       DataFieldY="YValue" DataFieldX="XValue" ItemsSource="{Binding ChartPoints}" Color="{Binding LinieColor}" LineStyle="Solid" />
                    </oxy:Plot.Series>
                </oxy:Plot>

    </Grid>
</UserControl>

// Mainwindow
<Window x:Class="MyLayerThicknessApp.Views.RecipesView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MyLayerThicknessApp.Views"
        xmlns:vm="clr-namespace:MyLayerThicknessApp.ViewModels"
        xmlns:lvc="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
        xmlns:oxy="clr-namespace:OxyPlot.Wpf;assembly=OxyPlot.Wpf"    
        xmlns:MyControls="clr-namespace:MyLayerThicknessApp.UserControls"
        mc:Ignorable="d"
        Title="RezepteWindow" Height="850" Width="1200" WindowStartupLocation="CenterOwner" Style="{StaticResource Window}" IsEnabled="{Binding MainWindowIsEnable}"  >
    <Window.DataContext>
        <vm:RecipesViewModel/>
    </Window.DataContext>


                <Grid Background="Transparent">
                    <MyControls:RefAufnehmenEdit Visibility="{Binding VisEditRefAufnehmen, Converter={StaticResource BooleanToVisibilityConverter}}"  />
                </Grid>

</Window>

我的视图模型。我也尝试使用颜色和画笔。什么都不管用。 INotifyPropertyChanged 在 MainViewMode 中。这肯定有效。

public class RecipesViewModel : MainViewModel
{
    private bool visEditRefAufnehmen;
    public bool VisEditRefAufnehmen
    {
        get { return visEditRefAufnehmen; }
        set
        {
            if (visEditRefAufnehmen != value)
            {
                visEditRefAufnehmen = value;
                 OnPropertyChanged("VisEditRefAufnehmen");  // To notify when the property is changed
            }
        }
    }

    private OxyColor linieColor = OxyColor.Parse("255,0,0");
    public OxyColor LinieColor
    {
        get { return linieColor; }
        set
        {
            if (linieColor != value)
            {
                linieColor = value;
                OnPropertyChanged("LinieColor");  // To notify when the property is changed
            }
        }
    }

    private List<DataPoint> currentchartPoints;
    public List<DataPoint> CurrentchartPoints
    {
        get { return currentchartPoints; }
        set
        {
            if (value != currentchartPoints)
            {
                currentchartPoints = value;
                OnPropertyChanged("CurrentchartPoints");
            }
        }
    }

    private void spektrumAufnehmen()
    {
        if (spektrometer == null)
        {
            spektrometer = MySpektrometer.getInstanz();
            spektrometer.SetINtegrationTime(10);
        }

        Task.Run(() =>
        {
            while (VisEditRefAufnehmen)
            {
                double[] intensity = MySpektrometer.Wrapper.getSpectrum(0);
                double[] wave = MySpektrometer.Wrapper.getWavelengths(0);

                wave = MyFilter.convertBigArrayToSmall(wave, intensity, Brechungsindex.WAVELENGTHAREA);
                ChartPoints = DoubleArrayToChartPoints(wave);
            }
        });

    }
}
// INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
    PropertyChangedEventHandler handler = PropertyChanged;
    if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}

Answer 1

属性 LineSeries.Color 需要 System.Windows.Media.Color 类型，而 ViewModel 属性中的 LinieColor 类型是 OxyColor.

来自 OxyPlot 来源

public static readonly DependencyProperty ColorProperty = DependencyProperty.Register(
                "Color", typeof(Color), typeof(Series), new PropertyMetadata(MoreColors.Automatic, AppearanceChanged));

来自您的 ViewModel

public OxyColor LinieColor

您可以使用将 OxyColor 转换为 Color 的转换器来解决绑定问题。下面是一个最简单的转换器。

public class OxyColorToColorConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is OxyColor color)
                return color.ToColor();

            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

在你的 XAML

<oxy:LineSeries DataFieldY="YValue" DataFieldX="XValue" ItemsSource="{Binding ChartPoints}" Color="{Binding LinieColor,Converter={StaticResource OxyColorToColorConverter}}" LineStyle="Solid" />

LinieSeries 颜色绑定不起作用 oxyPlot

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