Question

我正在尝试为名为radius的私有变量设置动画，该变量有效。然而，当它改变时，我正在尝试执行一个非常有问题的功能。

我的代码如下，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

具体地新的SetChildrenPositionDelegate（SetChildrenPosition）这一部分在这个序列中 part.Dispatcher.BeginInvoke（new SetChildrenPositionDelegate（SetChildrenPosition），new Object（））;

对任何能够帮助我的人都是如此。

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);
    }
}

Answer 1

当然 - 你只需要给代表一个目标。我个人将它拆分成这样：

AppPart part = d as AppPart;
// This creates a delegate instance associated with "part" - so it will
// effectively call part.SetChildrenPosition() accordingly
SetChildrenPositionDelegate action = part.SetChildrenPosition;
part.Dispatcher.BeginInvoke(action, new Object());

（顺便说一下，你需要new Object()部分吗？）

Answer 2

尝试：part.Dispatcher.BeginInvoke(() => part.SetChildrenPosition()));

使用委托，静态和依赖属性时出现问题

2 个答案: