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.是什么意思_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.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句