WPF DataGrid row background converter datagrid 行背景随绑定数据变化,转换器

 <DataGrid Grid.Row="" ItemsSource="{Binding SalesList,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" AutoGenerateColumns="False">
                <DataGrid.RowStyle>
                    <Style TargetType="DataGridRow">
                        <Setter Property="Background" >
                            <Setter.Value>
                                <Binding Path="SalesOrderDetailID" Converter="{StaticResource colorConverter}"/>
                            </Setter.Value>
                        </Setter>
                    </Style>
                </DataGrid.RowStyle>
                <DataGrid.Columns>
                    <DataGridTextColumn Header="SalesOrderID" Binding="{Binding SalesOrderID }"/>
                    <DataGridTextColumn Header="SalesOrderDetailID" Binding="{Binding SalesOrderDetailID}"/>
                    <DataGridTextColumn Header="ModifiedDate" Binding="{Binding ModifiedDate}"/>
                </DataGrid.Columns>
            </DataGrid>

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;
using System.Windows.Media;

namespace WpfApp39.Converter
{
    class ColorConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            int rowsIndex;
            if (value != null && int.TryParse(value.ToString(), out rowsIndex))
            {
                switch (rowsIndex % )
                {
                    case :
                        return new SolidColorBrush(Colors.Yellow);

                    case :
                        return new SolidColorBrush(Colors.Purple);

                    case :
                        return new SolidColorBrush(Colors.Red);

                    case :
                        return new SolidColorBrush(Colors.Green);

                    case :
                        return new SolidColorBrush(Colors.Blue);

                    default:
                        return new SolidColorBrush(Colors.Yellow);
                }
            }

            return new SolidColorBrush(Colors.Purple);
        }

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

<DataGrid.RowStyle>
<Style TargetType="DataGridRow">
<Setter Property="Background" >
<Setter.Value>
<Binding Path="SalesOrderDetailID" Converter="{StaticResource colorConverter}"/>
</Setter.Value>
</Setter>
</Style>
</DataGrid.RowStyle>