private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
        {
        
            if (i >= 3)//测试目的
                return;
            i++;

            ITextElement te = createTextElement(e.mapX,e.mapY,"魁x");
            axMapControl1.ActiveView.GraphicsContainer.AddElement(te as IElement, 1);
            axMapControl1.Refresh(esriViewDrawPhase.esriViewGraphics, null, null);

     
        }
        int i;

        public IBalloonCallout createBalloonCallout(double x, double y)
        {
            IRgbColor rgb = new RgbColorClass();
            {
                rgb.Red = 255;
                rgb.Green = 255;
                rgb.Blue = 200;

            }
            ISimpleFillSymbol sfs = new SimpleFillSymbolClass();
            {
                sfs.Color = rgb;
                sfs.Style = esriSimpleFillStyle.esriSFSSolid;
            }

            IPoint p = new PointClass();
            {
                p.PutCoords(x, y);
            }

            IBalloonCallout bc = new BalloonCalloutClass();
            {
                bc.Style = esriBalloonCalloutStyle.esriBCSRoundedRectangle;
                //
                bc.Symbol = sfs;
                //
                bc.LeaderTolerance = 10;
                //1

                bc.AnchorPoint = p;
            }

            return bc;
        }

        public ITextElement createTextElement(double x, double y, string text)
        {
            IBalloonCallout bc = createBalloonCallout(x, y);
            
            IRgbColor rgb = new RgbColorClass();
            {
                //rgb.Red = 255;
                rgb.Green = 255;
            }
            ITextSymbol ts = new TextSymbolClass();
            {
                ts.Color = rgb;
            }

            IFormattedTextSymbol fts = ts as IFormattedTextSymbol;
            {
                fts.Background = bc as ITextBackground;
            }
            //fts.Size = 8;
            ts.Size = 8;

            IPoint point = new PointClass();
            {
                double width = axMapControl1.Extent.Width / 13;
                double height = axMapControl1.Extent.Height / 20;
                point.PutCoords(x + width, y + height);
            }

            ITextElement te = new TextElementClass();
            //IMarkerElement me = new MarkerElementClass();
            {
                te.Symbol = ts;
                //ts.Text = text;
                te.Text = text;
            }

            IElement e = te as IElement;
            {
                e.Geometry = point;
            }
            return te;

        }
    }

    本文转自wenglabs博客园博客，原文链接：http://www.cnblogs.com/xiexiaokui/archive/2008/08/11/1265450.html，如需转载请自行联系原作者