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在AxmapControl上绘制点（point）线（line，polyline）都是比较方便的，函数如下：

/// 
        /// 在地图控件上绘制点或线        /// 
        /// 绘制符号        /// 绘制的图形        /// 地图控件        private void PRV_DrawOnMapControl(ISymbol IN_Symbol,IGeometry IN_Geometry,AxMapControl IN_AxmapControl)        {            //定义绘图容器            IGraphicsContainer Temp_GraphicsContainer = IN_AxmapControl.Map as IGraphicsContainer;            //设定参数            IElement Temp_TargetElement=new LineElementClass();//默认线元素            switch (IN_Geometry.GeometryType)            {                case esriGeometryType.esriGeometryPoint:                    IMarkerElement Temp_MarkerElement = new MarkerElementClass();                    //设定符号                    Temp_MarkerElement.Symbol = IN_Symbol as IMarkerSymbol;                    Temp_TargetElement = Temp_MarkerElement as IElement;                    Temp_TargetElement.Geometry = IN_Geometry;                    break;                case esriGeometryType.esriGeometryLine:                    //将Line转换成PolyLine                    object Missing1 = Type.Missing;                    object Missing2 = Type.Missing;                    ISegment Temp_Segment = IN_Geometry as ISegment;                    PolylineClass Temp_Polyline = new PolylineClass();                    Temp_Polyline.AddSegment(Temp_Segment, ref Missing1, ref Missing2);                    //绘制PolyLine                    ILineElement Temp_LineElement = new LineElementClass();                    Temp_LineElement.Symbol = IN_Symbol as ILineSymbol;                    Temp_TargetElement = Temp_LineElement as IElement;                    Temp_TargetElement.Geometry = Temp_Polyline;                    break;                case esriGeometryType.esriGeometryPolyline:                    ILineElement Temp_PolyLineElement = new LineElementClass();                    Temp_PolyLineElement.Symbol = IN_Symbol as ILineSymbol;                    Temp_TargetElement = Temp_PolyLineElement as IElement;                    Temp_TargetElement.Geometry = IN_Geometry;                    break;            }            //绘制            Temp_GraphicsContainer.AddElement((IElement)Temp_TargetElement, 0);            //刷新显示            IN_AxmapControl.ActiveView.Refresh();        }

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