如何在MVVM中更改网格列的颜色？

public class MyViewModel : INotifyPropertyChanged
{
    private SolidColorBrush gridColumnColor;

    public SolidColorBrush GridColumnColor
    {
        get { return gridColumnColor; }
        set
        {
            gridColumnColor = value;
            OnPropertyChanged(nameof(GridColumnColor));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

<Grid>
    <Grid.Resources>
        <Style TargetType="DataGridColumnHeader">
            <Style.Triggers>
                <DataTrigger Binding="{Binding GridColumnColor}" Value="Red">
                    <Setter Property="Background" Value="Red" />
                </DataTrigger>
                <DataTrigger Binding="{Binding GridColumnColor}" Value="Green">
                    <Setter Property="Background" Value="Green" />
                </DataTrigger>
                <!-- 可以根据需要添加更多的颜色条件 -->
            </Style.Triggers>
        </Style>
    </Grid.Resources>

    <DataGrid ItemsSource="{Binding DataItems}">
        <!-- 网格列定义 -->
    </DataGrid>
</Grid>