WPF datagrid RowDetailsTemplate实现伸展收缩

WPF实现的基于datagrid RowDetailsTemplate的伸展和收缩功能，是你参考学习的最佳例子。

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  2014-03-26 09:33  wpf datagrid\
     目录           0  2014-03-26 09:33  wpf datagrid\WpfApplication1\
     文件         887  2014-03-17 16:08  wpf datagrid\WpfApplication1.sln
     文件       55808  2014-03-26 09:32  wpf datagrid\WpfApplication1.suo
     文件         323  2014-03-26 09:32  wpf datagrid\WpfApplication1\App.xaml
     文件         311  2014-03-17 16:08  wpf datagrid\WpfApplication1\App.xaml.cs
     目录           0  2014-03-26 09:33  wpf datagrid\WpfApplication1\bin\
     目录           0  2014-03-26 09:33  wpf datagrid\WpfApplication1\bin\Debug\
     文件       43008  2014-03-26 09:32  wpf datagrid\WpfApplication1\bin\Debug\WpfApplication1.exe
     文件       85504  2014-03-26 09:32  wpf datagrid\WpfApplication1\bin\Debug\WpfApplication1.pdb
     文件       11600  2014-03-26 09:32  wpf datagrid\WpfApplication1\bin\Debug\WpfApplication1.vshost.exe
     文件         490  2010-03-17 22:39  wpf datagrid\WpfApplication1\bin\Debug\WpfApplication1.vshost.exe.manifest
     目录           0  2014-03-18 16:30  wpf datagrid\WpfApplication1\bin\Release\
     文件        3827  2014-03-20 08:38  wpf datagrid\WpfApplication1\DataPager.xaml
     文件        8900  2014-03-20 08:39  wpf datagrid\WpfApplication1\DataPager.xaml.cs
     文件         174  2014-03-20 16:07  wpf datagrid\WpfApplication1\Employee.cs
     目录           0  2014-03-26 09:33  wpf datagrid\WpfApplication1\obj\
     目录           0  2014-03-26 09:33  wpf datagrid\WpfApplication1\obj\x86\
     目录           0  2014-03-26 09:33  wpf datagrid\WpfApplication1\obj\x86\Debug\
     文件        2371  2014-03-26 09:32  wpf datagrid\WpfApplication1\obj\x86\Debug\App.g.cs
     文件        2369  2014-03-26 09:32  wpf datagrid\WpfApplication1\obj\x86\Debug\App.g.i.cs
     文件        3450  2014-03-26 09:32  wpf datagrid\WpfApplication1\obj\x86\Debug\DataPager.baml
     文件        7206  2014-03-26 09:32  wpf datagrid\WpfApplication1\obj\x86\Debug\DataPager.g.cs
     文件        7206  2014-03-26 09:32  wpf datagrid\WpfApplication1\obj\x86\Debug\DataPager.g.i.cs
     文件       20459  2014-03-26 09:32  wpf datagrid\WpfApplication1\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6740  2014-03-26 09:32  wpf datagrid\WpfApplication1\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件        4829  2014-03-19 17:30  wpf datagrid\WpfApplication1\obj\x86\Debug\FrmCheckedComboBox.g.i.cs
     文件           7  2014-03-26 09:32  wpf datagrid\WpfApplication1\obj\x86\Debug\GeneratedInternalTypeHelper.g.cs
     文件        3015  2014-03-26 09:32  wpf datagrid\WpfApplication1\obj\x86\Debug\GeneratedInternalTypeHelper.g.i.cs
     文件        8124  2014-03-19 17:30  wpf datagrid\WpfApplication1\obj\x86\Debug\GridPaging.g.i.cs
     文件        4091  2014-03-19 17:30  wpf datagrid\WpfApplication1\obj\x86\Debug\MainWindow.g.i.cs
............此处省略36个文件信息