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);

                 }

         }