将高度动画设置为从50到10，但从30 wpf开始

using System.Windows;
using System.Windows.Media.Animation;

namespace WpfApp
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            StartAnimation();
        }

        private void StartAnimation()
        {
            DoubleAnimation animation = new DoubleAnimation();
            animation.From = 50;
            animation.To = 10;
            animation.Duration = new Duration(TimeSpan.FromSeconds(1));
            animation.BeginTime = TimeSpan.FromSeconds(0.3);

            // 设置动画的目标对象和属性
            Storyboard.SetTarget(animation, myElement);
            Storyboard.SetTargetProperty(animation, new PropertyPath(FrameworkElement.HeightProperty));

            // 创建Storyboard并将动画添加到其中
            Storyboard storyboard = new Storyboard();
            storyboard.Children.Add(animation);

            // 启动动画
            storyboard.Begin();
        }
    }
}