WPF实现有动画效果的页面切换

实现Page切换，为Page增加淡入淡出(Fade)效果

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Windows;

namespace WpfApplication1
{
    /// 

    /// App.xaml 的交互逻辑
    /// 

    public partial class App : Application
    {
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2011-08-01 10:50  WPFapp\
     目录           0  2011-08-01 10:51  WPFapp\WpfApplication1\
     文件         935  2010-12-17 08:43  WPFapp\WpfApplication1.sln
     文件       30208  2011-04-15 17:01  WPFapp\WpfApplication1.suo
     文件         296  2010-12-17 08:43  WPFapp\WpfApplication1\App.xaml
     文件         311  2010-12-17 08:43  WPFapp\WpfApplication1\App.xaml.cs
     目录           0  2011-01-04 10:28  WPFapp\WpfApplication1\bin\
     目录           0  2011-01-04 10:28  WPFapp\WpfApplication1\bin\Debug\
     文件      421376  2011-04-15 16:54  WPFapp\WpfApplication1\bin\Debug\WpfApplication1.exe
     文件       77312  2011-04-15 16:54  WPFapp\WpfApplication1\bin\Debug\WpfApplication1.pdb
     文件       14328  2011-04-15 16:38  WPFapp\WpfApplication1\bin\Debug\WpfApplication1.vshost.exe
     文件         490  2007-07-21 01:33  WPFapp\WpfApplication1\bin\Debug\WpfApplication1.vshost.exe.manifest
     文件        4945  2007-07-18 09:38  WPFapp\WpfApplication1\from.gif
     文件        1684  2011-04-15 16:43  WPFapp\WpfApplication1\index.xaml
     文件        1154  2010-12-17 09:15  WPFapp\WpfApplication1\index.xaml.cs
     目录           0  2011-01-04 10:28  WPFapp\WpfApplication1\obj\
     目录           0  2011-04-15 17:00  WPFapp\WpfApplication1\obj\Debug\
     文件        2100  2011-04-15 15:33  WPFapp\WpfApplication1\obj\Debug\App.g.cs
     文件        2108  2011-04-15 16:54  WPFapp\WpfApplication1\obj\Debug\index.baml
     文件        4926  2011-04-15 16:54  WPFapp\WpfApplication1\obj\Debug\index.g.cs
     文件         876  2011-04-15 15:33  WPFapp\WpfApplication1\obj\Debug\Page1.baml
     文件        2905  2011-04-15 15:33  WPFapp\WpfApplication1\obj\Debug\Page1.g.cs
     文件         876  2011-04-15 15:33  WPFapp\WpfApplication1\obj\Debug\Page2.baml
     文件        2905  2011-04-15 15:33  WPFapp\WpfApplication1\obj\Debug\Page2.g.cs
     文件         876  2011-04-15 15:33  WPFapp\WpfApplication1\obj\Debug\Page3.baml
     文件        2905  2011-04-15 15:33  WPFapp\WpfApplication1\obj\Debug\Page3.g.cs
     目录           0  2011-01-04 10:28  WPFapp\WpfApplication1\obj\Debug\TempPE\
     文件         756  2011-04-15 15:33  WPFapp\WpfApplication1\obj\Debug\Window1.baml
     文件        2938  2011-04-15 15:33  WPFapp\WpfApplication1\obj\Debug\Window1.g.cs
     文件        3082  2011-04-15 17:00  WPFapp\WpfApplication1\obj\Debug\WpfApplication1.csproj.FileListAbsolute.txt
     文件         789  2010-12-17 09:22  WPFapp\WpfApplication1\obj\Debug\WpfApplication1.csproj.GenerateResource.Cache
............此处省略29个文件信息