WPF笔记|ch2.3.8 XAML练习

（认知有限，如有不妥，还望告知，欢迎讨论）

visual result:

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=reference==========

[1]https://learning.oreilly.com/library/view/pro-wpf-4-5/9781430243656/Chapter02.html#s21-21

[2]https://github.com/apress/pro-wpf-4.5-in-csharp