public static IWorkspaceName BrowseWorkspace(int hwnd,out IWorkspace ws)        {            IGxObjectFilterCollection ipFilters = new GxDialogClass();            //IGxObjectFilter ipFilter1 = new GxFilterFeatureDatasetsClass();  //要素数据集 ,导出时,IFeatureClassConverter对象无法写入Dataset中,此处隐藏掉            //ipFilters.AddFilter(ipFilter1,false);            IGxObjectFilter ifilt2 = new GxFilterWorkspacesClass();  //数据库工作空间,此类比较含糊,不知道具体指啥            ipFilters.AddFilter(ifilt2,false);            IGxObjectFilter ipFilter3 = new GxFilterFileFolderClass();  //文件工作空间            ipFilters.AddFilter(ipFilter3,false);            IGxDialog pGDialog = (IGxDialog)ipFilters;            pGDialog.RememberLocation = true;            pGDialog.Title = "请选择工作空间";            pGDialog.AllowMultiSelect = false;            IEnumGxObject pResultEnum = null;            //IWorkspace ws = null;            ws = null;            IWorkspaceName wsn = null;            if (pGDialog.DoModalOpen(hwnd, out pResultEnum) && pResultEnum != null)            {                IGxObject gxObj = pResultEnum.Next();                if (gxObj is IGxDatabase)                {                    IGxDatabase gxDB = gxObj as IGxDatabase;                    if (gxDB != null)                    {                        ws = gxDB.Workspace;                        wsn = gxDB.WorkspaceName;                    }                  }                else if (gxObj is IGxFolder)                {                    //Todo: figure out how to decide which workspace to get for                    // a particular folder (shapefile, raster etc.)                                        //IEnumName enumName = ((IGxFolder)gxObj).FileSystemWorkspaceNames;                    // for now just assume we want a shapefile ...                    IWorkspaceFactory wsf = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactoryClass();                    ws = wsf.OpenFromFile(((IGxFile)gxObj).Path, hwnd);                    IDataset pOutDataset = ws as IDataset;                    wsn = pOutDataset.FullName as IWorkspaceName;                }                else if (gxObj is IGxDataset)                {                    //如果是数据集工作空间                    IGxDataset gxDs = gxObj as IGxDataset;                    if (gxDs != null)                    {                        ws = gxDs.Dataset.Workspace;                        wsn = gxDs.DatasetName.WorkspaceName;                    }                                        }                Marshal.FinalReleaseComObject(pResultEnum);            }            pGDialog.InternalCatalog.Close();            Marshal.FinalReleaseComObject(pGDialog);                        return wsn;        }