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 = ;

                     pSimpleLineSymbol = new SimpleLineSymbolClass();
                     pSimpleLineSymbol.Color = pLineRgbColor;
                     double with =  / 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, );
                     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");
             }
         }