WPF折叠菜单、文字分割（自定义左侧导航菜单）

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  2018-01-08 10:28  WPF折叠菜单\
     目录           0  2018-01-08 10:28  WPF折叠菜单\WpfApplication1\
     目录           0  2018-01-08 10:28  WPF折叠菜单\WpfApplication1\.vs\
     目录           0  2018-01-08 10:28  WPF折叠菜单\WpfApplication1\.vs\WpfApplication1\
     目录           0  2018-01-08 10:28  WPF折叠菜单\WpfApplication1\.vs\WpfApplication1\v14\
     文件       58880  2018-05-02 16:43  WPF折叠菜单\WpfApplication1\.vs\WpfApplication1\v14\.suo
     目录           0  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\
     文件        1012  2018-01-08 10:28  WPF折叠菜单\WpfApplication1\WpfApplication1.sln
     文件         384  2018-01-08 10:28  WPF折叠菜单\WpfApplication1\WpfApplication1\App.xaml
     文件         311  2018-01-08 10:28  WPF折叠菜单\WpfApplication1\WpfApplication1\App.xaml.cs
     目录           0  2018-01-08 10:28  WPF折叠菜单\WpfApplication1\WpfApplication1\bin\
     目录           0  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\bin\Debug\
     文件       18432  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.exe
     文件       40448  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.pdb
     文件       22688  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.vshost.exe
     文件         490  2015-10-22 09:54  WPF折叠菜单\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.vshost.exe.manifest
     文件        1171  2018-01-08 13:43  WPF折叠菜单\WpfApplication1\WpfApplication1\FoldableMenu.xaml
     文件        5631  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\FoldableMenu.xaml.cs
     文件         669  2018-01-08 11:05  WPF折叠菜单\WpfApplication1\WpfApplication1\FoldableMenuPanel.xaml
     文件        5225  2018-01-08 11:50  WPF折叠菜单\WpfApplication1\WpfApplication1\FoldableMenuPanel.xaml.cs
     文件         811  2018-01-08 11:55  WPF折叠菜单\WpfApplication1\WpfApplication1\MainWindow.xaml
     文件        1814  2018-01-08 11:59  WPF折叠菜单\WpfApplication1\WpfApplication1\MainWindow.xaml.cs
     目录           0  2018-01-08 10:28  WPF折叠菜单\WpfApplication1\WpfApplication1\obj\
     目录           0  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\obj\Debug\
     文件        2349  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\obj\Debug\App.g.cs
     文件        2349  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\obj\Debug\App.g.i.cs
     文件        7024  2018-05-02 16:38  WPF折叠菜单\WpfApplication1\WpfApplication1\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件        1331  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\obj\Debug\FoldableMenu.baml
     文件        4481  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\obj\Debug\FoldableMenu.g.cs
     文件        4481  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\obj\Debug\FoldableMenu.g.i.cs
     文件        1071  2018-05-02 16:42  WPF折叠菜单\WpfApplication1\WpfApplication1\obj\Debug\FoldableMenuPanel.baml
............此处省略22个文件信息