/// <summary>
        /// 移动到Geometry。
        /// 对点的处理与其他类型不同
        /// </summary>
        /// <param name="mapControl"></param>
        /// <param name="geometry"></param>
        private void gotoGemetry(IMapControl2 mapControl, IGeometry geometry)
        {
            if (null == mapControl || null == geometry)
                return;

            IEnvelope envelope = geometry.Envelope;
            // 检查GeometryType，点的处理与其他类型不同
            if (geometry.GeometryType == esriGeometryType.esriGeometryPoint)
            {
                double xmax = envelope.XMax;
                double xmin = envelope.XMin;
                double ymax = envelope.YMax;
                double ymin = envelope.YMin;

                IEnvelope mapEnvelope = mapControl.Extent;
       double dbParHeight = mapEnvelope.Height / 2;
       double dbParWidth = mapEnvelope.Width / 2;
                envelope.YMax = (ymax + dbParHeight);
                envelope.YMin = (ymin - dbParHeight);
                envelope.XMax = (xmax + dbParWidth);
                envelope.XMin = (xmin - dbParWidth);
            }
            else
            {
                envelope.Expand(2, 2, true);
            }

            mapControl.Extent = envelope;

            /*
             * 如果后续的动作是闪烁geometry，必须加入下列语句，否则是先闪烁，后移动地图。
             */
            Application.DoEvents();
        }
 

将Geometry移动到屏幕中心