StoryboardSample.cs

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

namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        Storyboard sb_timer = new Storyboard() { Duration = TimeSpan.FromSeconds(1) };
        int sec = 5;

        public MainWindow()
        {
            InitializeComponent();
            sb_timer.Completed += sb_timer_Completed;
            sb_timer.Begin();
        }

        void sb_timer_Completed(object sender, EventArgs e)
        {
            if (sec > 0)
            {
                sec--;
                timerText.Text = sec.ToString();  //timerText是介面上的一個TextBlock
                sb_timer.Begin();   
            }
        }
    }
}