本文介绍如何使用指定符号绘制Polyline对象。所有绘图方法必须在StartDrawing和FinishDrawing调用之间进行，除非是在响应IActiveViewEvents::AfterDraw事件时进行绘图。在AfterDraw事件中绘图不需要StartDrawing和FinishDrawing。
DrawPolyline draws a Polyline object with the symbol that must be specified before hand with the SetSymbol method. All draw methods must be enclosed between the calls to StartDrawing and FinishDrawing unless you are drawing in response to the IActiveViewEvents::AfterDraw event.
只有在AfterDraw event.中不需要StartDrawing and FinishDrawing
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