将当前控件状态保存在viewstate中。
在这个阶段，所有的控件都从视图和控件状态中获取了信息。
In this stage controls are loaded with information retrieved from view and control states.
图5显示的是目前使用控件状态的控件列表及其存储的属性，供您参考。
Figure 5 shows a list of the controls that currently make use of control state and what properties they store there for your reference.
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