axMapControl绘制临时点

private void Draw_Point()
        {
            try
            {
                //首先要实现容器接口
                IGraphicsContainer pGraphicsContainer = axMapControl1.ActiveView as IGraphicsContainer;
                pGraphicsContainer.DeleteAllElements();//清空容器里面所有的元素

                //设置点的坐标
                IPoint pPoint = new PointClass();
                pPoint.SpatialReference = axMapControl1.Map.SpatialReference;
                double X=(double)PointData_X[curPtIndex];
                double Y=(double)PointData_Y[curPtIndex];
                pPoint.PutCoords(X,Y);
                
                //IMarkerElement用来获得symbol属性
                IMarkerElement pMarkerElement = new MarkerElementClass();

                //用ISimpleMarkerSymbol来设置点的属性
                ISimpleMarkerSymbol pSymbol = new SimpleMarkerSymbolClass();
                IRgbColor pRGBcolor = new RgbColorClass();

                pRGBcolor.Red = 255;
                pRGBcolor.Green = 0;
                pRGBcolor.Blue = 0;
                pSymbol.Color = pRGBcolor;//红色
                pMarkerElement.Symbol = pSymbol;

                //IElement用来获得Geometry属性
                IElement pElement = pMarkerElement as IElement;