| layoutRoot | 要执行布局重新构建的布局元素。 |
强制立即重新构建受计算影响的布局元素和子布局元素。
布局系统在常规使用时不应使用此方法。而应改用 MarkLayoutForRebuild，此方法可在下一布局过程期间触发延迟的布局重新构建。延迟的重新构建可按正确顺序自动处理整个布局层级视图中的对象，防止对相同布局元素执行多次重新计算。
但为了满足特殊的布局计算需求，可以使用 ForceRebuildLayoutImmediate 来立即解析子树的布局。甚至可以从内部布局计算方法（如 ILayoutController.SetLayoutHorizontal 或 ILayoutController.SetLayoutVertical）中执行此操作。仅限于在以下情况下使用：尽管会导致额外的性能损失，但多个布局通道仍不可避免。
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