用多点构造polyline问题

代码

   
     

    
      
    
      IPoint m_pPoint
    
      =
    
      new
    
       PointClass();
m_pPoint.PutCoords(x,y);
IPoint m_pPoint1
    
      =
    
      new
    
       PointClass();
m_pPoint1.PutCoords(x1,y1);
IPointCollection m_pPointCollection
    
      =
    
      new
    
       PolylineClass();

    
      object
    
       Missing
    
      =
    
      Type.Missing;
m_pPointCollection.AddPoint(m_pPoint,
    
      ref
    
       Missing,
    
      ref
    
       Missing);
m_pPointCollection.AddPoint(m_pPoint1,
    
      ref
    
       Missing,
    
      ref
    
       Missing);
IPolyline m_pPolyline
    
      =
    
      m_pPointCollection 
    
      as
    
       IPolyline;