【概念】app.xaml文件及x:Key
1、app.xaml
https://www.cnblogs.com/dotnet261010/p/6275821.html
2、x:Key
https://blog.csdn.net/weixin_44552202/article/details/92760906
/*******相与枕藉乎舟中，不知东方之既白*******/
1、app.xaml
https://www.cnblogs.com/dotnet261010/p/6275821.html
2、x:Key
https://blog.csdn.net/weixin_44552202/article/details/92760906
