只是好奇 - 乍一看似乎更笨拙，更不易发现，但是否有充分的理由？
我相信这是有意进行了一些模糊处理，因为大多数情况下你不应该直接操纵视觉树，这符合“框架设计准则”哲学的“常用类应遵循基本场景”的理念。
由于Visual中的任何方法基本上都能用于WPF控件，所以他们选择把这些高级方法放在一个独立的类中。框架设计人员试图在微妙地告诉你的是，“除非你真的知道没有更好的方法来做你正在做的事情，否则你不应该使用此函数”。
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