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问题描述
我有一个接口层次结构， c ParentBuilder 当然是 ParentBuilder ，而不是说， Child1Builder 旨在维护流利的通话链接。
As you can see, the ParentBuilder type expects to be cooperating with a derived type to allow it to return a properly-typed instance. Its own this reference won't due, because the type of this within ParentBuilder is, of course, ParentBuilder, and not, say, Child1Builder as intended to maintain the "fluent" call chaining.
我欠 getThis（）技巧到。
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