public override void OnClick()
        {
            //当前所有范围面,用来设置数据显示范围
            IFeatureLayer pRangeFeatLay = null;
            IFeatureLayer pFeatureLayer = null;
            IFeatureClass pFeatureClass = null;
            Exception     exError       = null;

            //如果工作库数据group图层已经存在 就不让再加了
            for (int i = 0; i < _AppHk.MapControl.LayerCount; i++)
            {
                ILayer mLayer = _AppHk.MapControl.get_Layer(i);
                if (mLayer is IGroupLayer)
                {
                    if (mLayer.Name == "现势库数据")
                    {
                        SysCommon.Error.ErrorHandle.ShowFrmErrorHandle("提示", "现势库数据图层已经存在。");
                        return;
                    }
                }
            }

            Plugin.Application.IAppFormRef pArrForm = _AppHk as Plugin.Application.IAppFormRef;
            pArrForm.MainForm.Cursor = System.Windows.Forms.Cursors.WaitCursor;
            //获取更新库体数据集
            if (_AppHk.DBXmlDocument == null)
            {
                pArrForm.MainForm.Cursor = System.Windows.Forms.Cursors.Default;
                return;
            }
            XmlNode DBNode = _AppHk.DBXmlDocument.SelectSingleNode(".//项目工程");

            if (DBNode == null)
            {
                return;
            }
            XmlElement DBElement = DBNode as XmlElement;
            XmlElement objNode   = DBNode.SelectSingleNode(".//目标数据连接") as XmlElement;

            SysCommon.Gis.SysGisDataSet pObjSysGisDataSet = new SysCommon.Gis.SysGisDataSet();
            pObjSysGisDataSet.SetWorkspace(objNode.GetAttribute("服务器"), objNode.GetAttribute("服务名"), objNode.GetAttribute("数据库"), objNode.GetAttribute("用户"), objNode.GetAttribute("密码"), objNode.GetAttribute("版本"), out exError);
            if (exError != null)
            {
                pArrForm.MainForm.Cursor = System.Windows.Forms.Cursors.Default;
                SysCommon.Error.ErrorHandle.ShowFrmErrorHandle("提示", "现势库数据连接失败,请确认");
                return;
            }
            //获取数据显示范围
            IGeometry pGeometry = null;

            pRangeFeatLay = ModDBOperator.GetMapFrameLayer("zone", _AppHk.MapControl, "示意图") as IFeatureLayer;
            if (pRangeFeatLay == null)
            {
                SysCommon.Error.ErrorHandle.ShowFrmErrorHandle("提示", "无法获取数据显示范围!");
                return;
            }
            //判断当前是否有示提交的范围面
            IFeatureCursor pFeatureCursor = pRangeFeatLay.Search(null, false);

            if (pFeatureCursor != null)
            {
                IFeature pFeature = pFeatureCursor.NextFeature();
                while (pFeature != null)
                {
                    if (pGeometry == null)
                    {
                        pGeometry = pFeature.Shape;
                    }
                    else
                    {
                        pGeometry = (pGeometry as ITopologicalOperator).Union(pFeature.Shape);
                    }
                    pFeature = pFeatureCursor.NextFeature();
                }
            }
            if (pGeometry == null)
            {
                SysCommon.Error.ErrorHandle.ShowFrmErrorHandle("提示", "无法获取数据显示范围!");
                return;
            }
            //获取所有更新数据的FeatureClass
            IFeatureDataset pFeaDataset = pObjSysGisDataSet.GetFeatureDataset("c_njtdt", out exError);// 这个地方要素集的名称是写死的 暂时没有办法获得工作库的信息 需要修改 陈新伟 20091211

            if (pFeaDataset == null)
            {
                pArrForm.MainForm.Cursor = System.Windows.Forms.Cursors.Default;
                SysCommon.Error.ErrorHandle.ShowFrmErrorHandle("提示", "无法获得指定的现势库数据【C_NJTDT】。");//yjl20120503
                return;
            }

            //符号化类
            //SymbolLyr symLyr = new SymbolLyr();   //@@@

            List <IDataset> listFC = pObjSysGisDataSet.GetFeatureClass(pFeaDataset);
            IGroupLayer     pLayer = new GroupLayerClass();

            pLayer.Name = "现势库数据";

            foreach (IDataset pDataset in listFC)
            {
                pFeatureClass = pDataset as IFeatureClass;
                if (pFeatureClass == null)
                {
                    continue;
                }
                pFeatureLayer = new FeatureLayerClass();
                if (pFeatureClass.FeatureType == esriFeatureType.esriFTAnnotation)
                {
                    pFeatureLayer = new FDOGraphicsLayerClass();
                }

                pFeatureLayer.FeatureClass = pFeatureClass;
                pFeatureLayer.Name         = pDataset.Name;
                pFeatureLayer.ScaleSymbols = false;
                //pFeatureLayer = ModDBOperator.GetSelectionLayer(pTempFeatureLayer, pGeometry);
                //if (pFeatureLayer == null) return;

                //符号化图层
                //symLyr.SymbolFeatrueLayer(pFeatureLayer);     //@@@

                //收缩图例
                if (pFeatureClass.FeatureType == esriFeatureType.esriFTSimple)
                {
                    ModDBOperator.ExpandLegend(pFeatureLayer as ILayer, false);
                }
                pLayer.Add(pFeatureLayer as ILayer);
            }
            _AppHk.MapControl.Map.AddLayer(pLayer);
            pObjSysGisDataSet.CloseWorkspace(true);

            //对图层进行排序
            SysCommon.Gis.ModGisPub.LayersCompose(pLayer);

            //将图幅结合表置于底层
            //ModDBOperator.MoveMapFrameLayer(_AppHk.MapControl);
            _AppHk.TOCControl.Update();
            _AppHk.MapControl.Map.ClipGeometry = pGeometry;
            _AppHk.MapControl.ActiveView.Refresh();

            pArrForm.MainForm.Cursor = System.Windows.Forms.Cursors.Default;
        }