说明：（1）使用Visual Studio 2010新建一个WPF应用程序项目，
（2）然后将WPF项目名称保存为：WpfApplication1，
（3）接着将下面的代码复制到MainWindow.cs文件中
（4）在C：\盘根目录下新建一个文件夹，名称为temp
（5）将需要播放的图片复制到该文件夹下。
（6）编译运行程序即可。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
using System.IO;
 
namespace WpfApplication1
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        Storyboard myStoryboard;
        Storyboard ibstoryboard;
        string[] files;
 
        Image myImage;
        public MainWindow()
        {
            InitializeComponent();
            GetImageFileInfo();
 
            NameScope.SetNameScope(this, new NameScope());            
            StackPanel myPanel = new StackPanel();
            myPanel.Margin = new Thickness(10);
            this.Title = "淡入淡出特效显示";
            this.WindowState = WindowState.Maximized;
            this.WindowStyle = System.Windows.WindowStyle.None;             this.Topmost = true;
            myImage = new Image();
            myImage.Name = "myImage";
 
            this.RegisterName(myImage.Name, myImage);
            myImage.Width = SystemParameters.PrimaryScreenWidth; ;
            myImage.Height = SystemParameters.PrimaryScreenHeight;
 
            ObjectAnimationUsingKeyFrames myObjectAnimation = new
ObjectAnimationUsingKeyFrames();
            myObjectAnimation.Duration = new Duration(TimeSpan.FromSeconds(25));
            for (int i = 0; i < files.Length; i++)
            {
                ImageBrush ib = new ImageBrush();
                ib.ImageSource = new BitmapImage(new Uri(files[i].ToString()));
                myObjectAnimation.KeyFrames.Add(new
DiscreteObjectKeyFrame(ib.ImageSource,
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(5 * i))));
            }
            myObjectAnimation.AutoReverse = true;
            myObjectAnimation.RepeatBehavior = RepeatBehavior.Forever;
            Storyboard.SetTargetName(myObjectAnimation, myImage.Name);
            Storyboard.SetTargetProperty(myObjectAnimation, new
PropertyPath(Image.SourceProperty));
            ibstoryboard = new Storyboard();
            ibstoryboard.Children.Add(myObjectAnimation);
 
            DoubleAnimation myDoubleAnimation = new DoubleAnimation();
            myDoubleAnimation.From = 0.0;
            myDoubleAnimation.To = 1.0;
            myDoubleAnimation.Duration = new Duration(TimeSpan.FromSeconds(5));
            myDoubleAnimation.AutoReverse = true;
            myDoubleAnimation.RepeatBehavior = RepeatBehavior.Forever;
 
            myStoryboard = new Storyboard();
            myStoryboard.Children.Add(myDoubleAnimation);
            Storyboard.SetTargetName(myDoubleAnimation, myImage.Name);
            Storyboard.SetTargetProperty(myDoubleAnimation, new
PropertyPath(Image.OpacityProperty));
 
            // Use the Loaded event to start the Storyboard.
            myImage.Loaded += new RoutedEventHandler(myImageLoaded);
 
            myPanel.Children.Add(myImage);
            this.Content = myPanel;         }
        private void myImageLoaded(object sender, RoutedEventArgs e)
        {
            myStoryboard.Begin(this);
            ibstoryboard.Begin(this);
        }
        private void GetImageFileInfo()
        {                       
            string temp = @"c:\temp\";
            files = Directory.GetFiles(temp, "*.jpg");
        }
 
        private void Window_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Escape)
            {
                MessageBoxResult yesno;
                yesno = MessageBox.Show("确定要退出程序吗？","退出程序提示
",MessageBoxButton.YesNo);
                if(yesno == MessageBoxResult.Yes)
                    this.Close();               
 
            }
        }
 
    }
}