告知设计主应用程式，由提供的矩形表示的区域需要在设计介面上重新绘制。
Notifies the design host that the area represented by the provided rectangle needs to be repainted on the design surface.
告知设计主应用程式，由提供的矩形表示的区域需要在设计介面上重新绘制。
Notifies the design host that the area represented by the provided rectangle needs to be repainted on the design surface.
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