添加点标注IMarkerElement

 private void AddPointElement(IPoint pPoint)
         {
             if (pPoint != null)
             {
                 IElement pElement = null;
                 IRgbColor pColor = new RgbColorClass();
                 pColor.Green = ;

                 double pSize = Math.Round( / this.axMapControl1.MapScale, );
                 if (pSize < )
                     pSize = ;
                 if (pSize > )
                     pSize = ;

                 IMarkerElement pMarkerElement = new MarkerElementClass();
                 ISimpleMarkerSymbol pMarkerSymbol = new SimpleMarkerSymbolClass();
                 pMarkerSymbol.Color = pColor;
                 pMarkerSymbol.Angle = ;
                 pMarkerSymbol.Size = pSize;
                 pMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSCircle;

                 pMarkerElement.Symbol = pMarkerSymbol;
                 pElement = pMarkerElement as IElement;
                 pElement.Geometry = pPoint;

                 this.axMapControl1.ActiveView.GraphicsContainer.AddElement(pElement, );
                 this.axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, this.axMapControl1.ActiveView.Extent);

                 }
         }