使显示在设计图面上的控件的整个区域无效，并向控件设计器发送重新绘制控件的信号。

Invalidates the whole area of the control that is displayed on the design surface and signals the control designer to redraw the control.

youdao

使显示在设计图面上的控件的指定区域无效，并向控件设计器发送重新绘制控件的信号。

Invalidates the specified area of the control that is displayed on the design surface and signals the control designer to redraw the control.

youdao

使显示在设计图面上的控件的指定区域无效，并向控件设计器发送重新绘制控件的信号。

Invalidates the specified area of the control that is displayed on the design surface and signals the control designer to redraw the control.

youdao