您的问题似乎不完整，您是想询问关于C语言编程的某个具体问题吗？比如C语言的语法、编程技巧、项目开发等。请提供更具体的信息，这样我才能给出更准确的回答。

本文共计529个文字，预计阅读时间需要3分钟。

Control.Refresh：强制控件使其工作区域无效并立即重绘自身及任何子控件。==Control.Invalidate：使控件的特定区域无效。==Control.Update：更新控件显示。

Control.Refresh - does an Control.Invalidate followed by Control.Update.
Refresh: 强制控件使其工作区无效并立即重绘自己和任何子控件。== Invalidate Update

Control.Invalidate - invalidates a specific region of the Control (defaults to entire client area) and causes a paint message to be sent to the control.Invalidate marks the control (region, or rect) as in need of repainting, but doesn't immediately repaint (the repaint is triggered when everything else has been taken care of and the app becomes idle).
Invalidate: 使控件的特定区域(可以自己设置区域，从而提高性能)无效并向控件发送绘制消息。
将控件标记为需要重绘，但是不会立即执行刷新重绘，等到系统空闲时进行重绘。