wpf 扫描文件夹下面所有图片 并加载到面板控件，实现点击切换图片

wpf 扫描文件夹下面所有图片 并加载到面板控件，实现点击切换图片，代码简洁 注释详细 初学者可以看下

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件        1014  2019-04-12 09:22  WpfApplication3.sln
     文件       44544  2019-04-12 09:41  WpfApplication3.v12.suo
     目录           0  2019-04-12 09:33  WpfApplication3\
     文件         187  2019-04-12 09:22  WpfApplication3\App.config
     文件         326  2019-04-12 09:22  WpfApplication3\App.xaml
     文件         342  2019-04-12 09:22  WpfApplication3\App.xaml.cs
     目录           0  2019-04-12 09:22  WpfApplication3\bin\
     目录           0  2019-04-12 09:33  WpfApplication3\bin\Debug\
     文件       11264  2019-04-12 09:33  WpfApplication3\bin\Debug\WpfApplication3.exe
     文件         187  2019-04-12 09:22  WpfApplication3\bin\Debug\WpfApplication3.exe.config
     文件       26112  2019-04-12 09:33  WpfApplication3\bin\Debug\WpfApplication3.pdb
     文件       24224  2019-04-12 09:33  WpfApplication3\bin\Debug\WpfApplication3.vshost.exe
     文件         187  2019-04-12 09:22  WpfApplication3\bin\Debug\WpfApplication3.vshost.exe.config
     文件         490  2018-04-12 07:35  WpfApplication3\bin\Debug\WpfApplication3.vshost.exe.manifest
     文件         358  2019-04-12 09:33  WpfApplication3\MainWindow.xaml
     文件        5156  2019-04-12 09:33  WpfApplication3\MainWindow.xaml.cs
     目录           0  2019-04-12 09:22  WpfApplication3\obj\
     目录           0  2019-04-12 09:33  WpfApplication3\obj\Debug\
     文件        2333  2019-04-12 09:33  WpfApplication3\obj\Debug\App.g.cs
     文件        2333  2019-04-12 09:33  WpfApplication3\obj\Debug\App.g.i.cs
     文件        7132  2019-04-12 09:41  WpfApplication3\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件         810  2019-04-12 09:33  WpfApplication3\obj\Debug\MainWindow.baml
     文件        3527  2019-04-12 09:33  WpfApplication3\obj\Debug\MainWindow.g.cs
     文件        3527  2019-04-12 09:41  WpfApplication3\obj\Debug\MainWindow.g.i.cs
     文件           0  2019-04-12 09:22  WpfApplication3\obj\Debug\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs
     文件           0  2019-04-12 09:22  WpfApplication3\obj\Debug\TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs
     文件           0  2019-04-12 09:22  WpfApplication3\obj\Debug\TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs
     目录           0  2019-04-12 09:22  WpfApplication3\obj\Debug\TempPE\
     文件        1242  2019-04-12 09:41  WpfApplication3\obj\Debug\WpfApplication3.csproj.FileListAbsolute.txt
     文件         919  2019-04-12 09:33  WpfApplication3\obj\Debug\WpfApplication3.csproj.GenerateResource.Cache
     文件        2354  2019-04-12 09:33  WpfApplication3\obj\Debug\WpfApplication3.csprojResolveAssemblyReference.cache
............此处省略13个文件信息