WPF 使用MVVM模式 关闭窗口

WPF使用Mvvm 模式关闭窗口（Window），简单明了。绝对可信

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-03-01 12:26  mvvm_demo_close_window\
     目录           0  2018-03-01 12:26  mvvm_demo_close_window\mvvm_demo_close_window\
     目录           0  2018-03-01 12:26  mvvm_demo_close_window\mvvm_demo_close_window\.vs\
     目录           0  2018-03-01 12:26  mvvm_demo_close_window\mvvm_demo_close_window\.vs\mvvm_demo_close_window\
     目录           0  2018-03-01 12:27  mvvm_demo_close_window\mvvm_demo_close_window\.vs\mvvm_demo_close_window\v15\
     文件       91648  2018-03-01 13:19  mvvm_demo_close_window\mvvm_demo_close_window\.vs\mvvm_demo_close_window\v15\.suo
     目录           0  2018-03-01 12:27  mvvm_demo_close_window\mvvm_demo_close_window\.vs\mvvm_demo_close_window\v15\Server\
     目录           0  2018-03-01 13:19  mvvm_demo_close_window\mvvm_demo_close_window\.vs\mvvm_demo_close_window\v15\Server\sqlite3\
     文件           0  2018-03-01 12:27  mvvm_demo_close_window\mvvm_demo_close_window\.vs\mvvm_demo_close_window\v15\Server\sqlite3\db.lock
     文件      667648  2018-03-01 13:19  mvvm_demo_close_window\mvvm_demo_close_window\.vs\mvvm_demo_close_window\v15\Server\sqlite3\storage.ide
     目录           0  2018-03-01 13:02  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\
     文件         908  2018-01-30 16:21  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window.sln
     文件       34304  2018-01-30 16:48  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window.suo
     文件         333  2018-01-30 16:21  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\App.xaml
     文件         324  2018-01-30 16:21  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\App.xaml.cs
     目录           0  2018-03-01 13:02  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\bin\
     目录           0  2018-03-01 12:27  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\bin\Debug\
     文件       14848  2018-03-01 13:02  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\bin\Debug\mvvm_demo_close_window.exe
     文件       38400  2018-03-01 13:02  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\bin\Debug\mvvm_demo_close_window.pdb
     目录           0  2018-03-01 13:02  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\bin\Release\
     文件         630  2018-03-01 13:02  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\ChildWindow.xaml
     文件         304  2018-03-01 13:01  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\ChildWindow.xaml.cs
     目录           0  2018-01-30 16:24  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\Commands\
     文件        2173  2018-01-30 16:26  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\Commands\DelegateCommand.cs
     文件         463  2018-01-30 16:26  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\MainWindow.xaml
     文件        1006  2018-03-01 13:01  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\MainWindow.xaml.cs
     文件        4753  2018-03-01 13:02  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window.csproj
     文件         463  2018-01-30 16:34  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\Notificationobject.cs
     目录           0  2018-01-30 16:21  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\obj\
     目录           0  2018-01-30 16:21  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\obj\x86\
     目录           0  2018-03-01 13:02  mvvm_demo_close_window\mvvm_demo_close_window\mvvm_demo_close_window\obj\x86\Debug\
............此处省略34个文件信息