WPF中动画

动画命名空间：using System.Windows.Media.Animation;

                    Content="执行动画"
            x:Name="btn" 
            Width="100" 
            Height="40" 
            Click="btn_Click">
   

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Media.Animation;
 
namespace WpfApp1
{
    /// 
    /// MainWindow.xaml 的交互逻辑
    /// 
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
 
        private void btn_Click(object sender, RoutedEventArgs e)
        {
            //创建一个双精度的动画
            DoubleAnimation animation = new DoubleAnimation();
            animation.From = btn.Width;//动画的初始值
            animation.To = btn.Width - 30; //动画的结束值
            animation.Duration = TimeSpan.FromSeconds(2);//动画的持续时间
            animation.AutoReverse = true;//动画变化后恢复原状
            animation.RepeatBehavior = new RepeatBehavior(5);//new 执行次数 //RepeatBehavior.Forever;//一直重复执行   执行周期
 
            animation.Completed += animation_Completed;//动画完成后执行的事件
 
 
            btn.BeginAnimation(Button.WidthProperty, animation);
        }
        private void animation_Completed(object sender, EventArgs e)
        {
            btn.Content = "动画已完成";
        }
    }
}