使用委托、静态和依赖属性时出现问题

我正在尝试设置一个名为radius的私有变量的动画,它可以工作。然而,当它发生变化时,我试图执行一个函数,这将是一个相当大的问题。

我的代码在下面,它不会运行,因为它有以下错误 非静态字段、方法或属性“apppart.setChildrenPosition()”需要对象引用

明确地 新的setChildrenPositionDelegate(setChildrenPosition) 这句话的这一部分 part.dispatcher.beginInvoke(新的setChildrenPositionDelegate(setChildrenPosition),新对象());

感谢任何能帮助我的人。

class AppPart : Shape
{
    public string name
    { get; set; }

    public List<AppPart> parts
    { get; set; }

    private double radius
    {
        get { return (double)GetValue(radiusProperty); }
        set { SetValue(radiusProperty, value); }
    }
    public static readonly DependencyProperty radiusProperty = DependencyProperty.Register(
            "radius",
            typeof(double),
            typeof(AppPart),
            new PropertyMetadata(
            new PropertyChangedCallback(radiusChangedCallback)));



    private delegate void SetChildrenPositionDelegate();

    private void SetChildrenPosition()
    {
        //do something with radius
    }

    private static void radiusChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        AppPart part = d as AppPart;
        part.Dispatcher.BeginInvoke(new SetChildrenPositionDelegate(SetChildrenPosition), new Object());
    }

    private void AnimateRadius(double start, double end)
    {
        DoubleAnimation ani = new DoubleAnimation();
        ani.From = start;
        ani.To = end;
        ani.FillBehavior = FillBehavior.HoldEnd;
        ani.Duration = new Duration(new TimeSpan(0, 0, 0, 3, 0));
        ani.Completed += delegate
        {
            Console.WriteLine("ani ended");
        };
        this.BeginAnimation(AppPart.radiusProperty, ani);
    }
}