添加线标注ILineElement

private void AddLineElement(IPolyline polyline)
        {
            try
            {
                IPolyline pPolyline = polyline; 
                IRgbColor pLineRgbColor = null;
                ISimpleLineSymbol pSimpleLineSymbol = null;
                ILineElement pFillShapeElement = null;
                IElement pElement;
                if (pPolyline != null)
                {
                    pLineRgbColor = new RgbColorClass();
                    pLineRgbColor.Red = 255;

                    pSimpleLineSymbol = new SimpleLineSymbolClass();
                    pSimpleLineSymbol.Color = pLineRgbColor;
                    double with = 72 / this.axMapControl1.MapScale;
                    if (with >= 0.002)
                        with = 0.002;
                    pSimpleLineSymbol.Width = with;


                    pFillShapeElement = new LineElementClass();
                    pFillShapeElement.Symbol = pSimpleLineSymbol;
                    pElement = pFillShapeElement as IElement;
                    pPolyline.SpatialReference = this.axMapControl1.SpatialReference;
                    pElement.Geometry = pPolyline as IGeometry;

                    this.axMapControl1.ActiveView.GraphicsContainer.AddElement(pElement, 0);
                    this.axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, pElement, this.axMapControl1.ActiveView.Extent);
                   
                }
                            }
            catch (Exception ee)
            {
                System.Windows.Forms.MessageBox.Show(ee.Message, "添加线标注");
            }
        }